期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到1,359篇文章
< 1 2 … 68 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Anomalous Acoustic Plasmons in Two-Dimensional Over-Tilted Dirac Bands 认领 引用
1
作者 Chang-Xu Yan Furu Zhang +3 位作者 Chao-Yang Tan Hao-Ran Chang Jianhui Zhou Yugui Yao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第4期238-251,共14页
The over-tilting of Dirac cones has led to various fascinating quantum phenomena.In this study,we demonstrate that the distinct geometry of two-dimensional type-II Dirac cones dictates the emergence of anomalous acous... The over-tilting of Dirac cones has led to various fascinating quantum phenomena.In this study,we demonstrate that the distinct geometry of two-dimensional type-II Dirac cones dictates the emergence of anomalous acoustic plasmons(AAPs)that deviate from that of the conventionalГq plasmon. 展开更多
关键词 anomalous acoustic plasmons aaps dirac cones type II Dirac cones plasmons quantum phenomenain anomalous acoustic plasmons quantum phenomena conventional q plasmon
暂未订购 下载PDF
Minimal Odd-Node Weyl-Dirac Complex and Strain-Induced Topological Phase Transition 认领 引用
2
作者 Ze-Xin Xue Ke-Xin Pang +3 位作者 Yun-Yun Bai Yan-Feng Ge Yan Gao Zhong-Yi Lu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期122-127,I0077-I0083,共6页
The Nielsen-Ninomiya theorem enforces vanishing total topological charge,typically realized by pairwise nodes of the same type.Whether a minimal,odd-numbered heterogeneous configuration of chiral Weyl-Dirac fermions c... The Nielsen-Ninomiya theorem enforces vanishing total topological charge,typically realized by pairwise nodes of the same type.Whether a minimal,odd-numbered heterogeneous configuration of chiral Weyl-Dirac fermions can exist in crystalline systems remains elusive.Here,by an exhaustive symmetry analysis of all 230 space groups(SGs),we reveal that only 3(6)SGs without(with)spin-orbit coupling can host an isolated three-terminal Weyl-Dirac complex.Guided by this symmetry requirement,we predict a previously unre-ported 3D boron allotrope(ATBCN-B28)hosting exactly three unpaired topological nodes near the Fermi level:one=-2 Dirac point(DP)and two=+1 Weyl points(WPs).This zero-net-chirality complex manifests unique bulk-boundary correspondences,featuring extended and ultra-long“S”-shaped double Fermi arcs.Furthermore,a symmetry-breaking shear strain drives a topological phase transition,split-ting the DP to yield the absolute minimal configuration of exactly four conventional WPs allowable in non-magnetic systems.Our work circumvents the conventional even-node pairing paradigm,establishing a theoretical and material foundation for exploring minimal mixed-chirality topological fermions and their dynamic phase transitions. 展开更多
关键词 crystalline systems minimal odd node strain induced topological phase transition symmetry analysis topological charge Nielsen Ninomiya theorem Weyl Dirac complex chiral Weyl Dirac fermions
暂未订购 下载PDF
Synthesis of two-dimensional Dirac semi-metallic NiTe as high-performance contacts for MoS2 transistors 认领 引用
3
作者 Yingying Liu Yong Liu +16 位作者 Liqiang Zhang Xiang Lan Chen Yi Jingmei Tang Shanhao Li Yanru Wang Huan Cheng Kun He Ping Lu Zucheng Zhang Di Wang Hongmei Zhang Yukun Guo Yani Jiang Shaojun Liu Shula Chen Xidong Duan 《Nano Materials Science》 EI CAS CSCD 2026年第4期886-892,共7页
Two-dimensional Dirac semi-metals have attracted extensive attention for their potential applications in nextgeneration electronics,optoelectronics and quantum technologies.However,numerous topological semimetals pred... Two-dimensional Dirac semi-metals have attracted extensive attention for their potential applications in nextgeneration electronics,optoelectronics and quantum technologies.However,numerous topological semimetals predicted by theory have not yet been experimentally confirmed.Here,we report the controlled synthesis of high-quality NiTe nanosheets via the chemical vapor deposition method.Theoretical analysis confirms the semi-metallic nature of centrosymmetric NiTe and elucidates that its unusual second harmonic generation response originates from the electron transitions between linear dispersed bands near Dirac cone.Furthermore,NiTe nanosheets exhibit an ultra-high conductivity exceeding 10~6 S m-1,rivaling noble metal-based Dirac semimetals.Dirac semi-metallic NiTe serves as a contact electrode for MoS2field-effect transistors,showing a remarkable apparent carrier mobility of 22.45 cm2V-1s-1,which is 6.43 times higher than that of the Au-MoS2device.These findings establish NiTe as an ideal platform for exploring topological quantum states and advancing high-performance electronic devices. 展开更多
关键词 2D Dirac semi-metals Chemical vapor deposition Controlled synthesis Unusual second harmonic generation response Contact electrode
暂未订购 下载PDF
Solving nuclear Dirac Woods-Saxon potential with a physics-informed neural network 认领 引用
4
作者 Xiao-Kai Du Shuang-Quan Zhang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第3期98-107,共10页
A physics-informed neural network(PINN)is built to solve the nucleonic Dirac equation.The PINN employs the residual of the Dirac equation as the objective function instead of the variation of the energy expectation va... A physics-informed neural network(PINN)is built to solve the nucleonic Dirac equation.The PINN employs the residual of the Dirac equation as the objective function instead of the variation of the energy expectation value,thereby avoiding the variational collapse problem.By integrating the automatic differentiation techniques,the PINN also overcomes the Fermion doubling problem.A constraint term in the loss function of the PINN is designed to avoid trivial solutions and an orthogonality constraint term is used to search for the excited states.The performance of the unsupervised PINN is evaluated by solving the orbitals below the Fermi surface of16O and208Pb in the Dirac Woods-Saxon(WS)potential.Compared to the results obtained by the traditional shooting method,obtained energies have relative errors on the order of 10-3and the root-meansquare errors of the corresponding wave functions are also on the order of 10-3. 展开更多
关键词 machine learning physics-informed neural network Dirac Woods—Saxon potential single particle orbitals
暂未订购 下载PDF
Coexistence of near-EF Van Hove Singularity and in-Gap Topological Dirac Surface States in Superconducting Electrides 认领 引用
5
作者 Yin Yang Peihan Sun +9 位作者 Ye Shen Zhijun Tu Pengcheng Ma Hongrun Zhen Tianqi Wang Longli Tian Tian Cui Hechang Lei Kai Liu Zhonghao Liu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第1期213-217,共5页
Superconducting elect rides have attracted growing attention for their potential to achieve high superconducting transition temperatures(TC)under pressure.However,many known elect rides are chemically reactive and ... Superconducting elect rides have attracted growing attention for their potential to achieve high superconducting transition temperatures(TC)under pressure.However,many known elect rides are chemically reactive and unstable,making high-quality single-crystal growth,characterization,and measurements difficult,and most do not exhibit superconductivity at ambient pressure.In contrast,La3 In stands out for its ambient-pressure superconductivity(TC∼9.4 K)and the availability of high-quality single crystals.Here,we investigate its low-energy electronic structure using angle-resolved photoemission spectroscopy and first-principles calculations.The bands near the Fermi energy(EF)are mainly derived from La 5d and In 5p orbitals.A saddle point is directly observed at the Brillouin zone(BZ)boundary,while a three-dimensional Van Hove singularity crosses EF at the BZ corner.First-principles calculations further reveal topological Dirac surface states within the bulk energy gap above EF.The coexistence of a high density of states and in-gap topological surface states nearF suggests that La3In offers a promising platform for tuning superconductivity and exploring possible topological superconducting phases through doping or external pressure. 展开更多
关键词 ambient pressure superconductivity superconducting elect rides gap topological Dirac surface states La superconducting electrides near efVan Hove singularity angle resolved photoemission spectroscopy elect rides
暂未订购 下载PDF
Thermal properties of the Dirac oscillator in Amelino-Camelia and Magueijo-Smolin DSR theories 认领 引用
6
作者 Abdelmalek Boumali Nosratollah Jafari 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第2期211-219,共9页
This study investigates the thermal and statistical properties of the Dirac oscillator within the framework of two prominent formulations of doubly special relativity(DSR):the Amelino-Camelia and Magueijo-Smolin model... This study investigates the thermal and statistical properties of the Dirac oscillator within the framework of two prominent formulations of doubly special relativity(DSR):the Amelino-Camelia and Magueijo-Smolin models.DSR extends Einstein's special relativity by introducing an additional invariant scale—the Planck energy—leading to modified energy-momentum relations that encode potential quantum-gravitational effects at ultra-high energies.In this context,we derive the modified Dirac equations for both DSR scenarios and analytically determine the corresponding energy spectra.These spectra are subsequently used to compute the partition function and key thermodynamic quantities,including specific heat,by employing the Euler-Maclaurin formula to facilitate an efficient approximation of the partition function.The analysis is restricted to the positive-energy sector,enabled by the exact Foldy-Wouthuysen transformation,which effectively decouples positive and negative energy states.The findings reveal that Planck-scale deformation parameters induce significant modifications in the energy spectrum and thermodynamic behavior of the Dirac oscillator in each DSR framework,thereby offering valuable insights into possible observable imprints of quantum gravitational phenomena in relativistic quantum systems. 展开更多
关键词 Dirac oscillator thermal properties AmelinoCamelia and MagueijoSmolin DSR theories
暂未订购 下载PDF
含Dirac材料一维光子晶体中的隧穿模特性 认领 引用
7
作者 徐磊 王兴林 《量子电子学报》 CAS CSCD 北大核心 2026年第4期649-657,共9页
光子晶体因其独特的电磁特性及其在光电子器件领域的广泛应用而备受关注。本文研究了由Dirac材料构成的一维对称型光子晶体在引入掺杂后的隧穿模特性。研究发现,该光子晶体的透射谱中出现零-平均折射率、Dirac和布拉格三种光子带隙。引... 光子晶体因其独特的电磁特性及其在光电子器件领域的广泛应用而备受关注。本文研究了由Dirac材料构成的一维对称型光子晶体在引入掺杂后的隧穿模特性。研究发现,该光子晶体的透射谱中出现零-平均折射率、Dirac和布拉格三种光子带隙。引入掺杂后,Dirac带隙不支持隧穿模传输;而对于零-平均折射率带隙和布拉格带隙,随着入射光的入射角以及Dirac材料结构参数的变化,可出现多个完全隧穿模,并可实现模式分离、简并与模式频率间隔的多自由度调控。此外,受界面效应及Dirac材料色散特性的影响,光子晶体内部的电场局域在周期材料单元的界面处,相对于掺杂层呈对称分布,且在靠近掺杂层时强度达到峰值。 展开更多
关键词 光电子学 光子隧穿 传输矩阵 Dirac材料
暂未订购 下载PDF
Transmission property of one-dimensional Dirac-semimetal-defected photonic crystal in terahertz multi-bandgap 认领 引用
8
作者 Ji-Kai Wang Li Jiang +1 位作者 Xue-Fei Yang Ji-He Zhao 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第1期498-505,共8页
A symmetrical one-dimensional(1D)photonic crystal structure with a Dirac-emimetal-defected layer is proposed.The material properties of the Dirac semimetal are governed by three key parameters:Fermi level,Fermi veloci... A symmetrical one-dimensional(1D)photonic crystal structure with a Dirac-emimetal-defected layer is proposed.The material properties of the Dirac semimetal are governed by three key parameters:Fermi level,Fermi velocity,and degeneracy factor.Simulation results demonstrate that the proposed structure generates multiple photonic bandgaps within the THz frequency range.In the low-THz region,pronounced resonant transmission peaks emerge,enabling near-perfect filtering performance.The positions of these defect modes can be dynamically tuned by adjusting the Fermi level and degeneracy factor.In mid-and high-THz frequency bands,the Dirac semimetal begins to exhibit metallic behavior,leading to attenuation of the transmission peaks and the appearance of absorption.The elevation of the Fermi level delays the critical threshold for the transition from the dielectric state to the metallic state,while an increase in Fermi velocity suppresses metallic behavior.Therefore,enhancing both the Fermi level and Fermi velocity contributes to strengthening the defect peak intensity.Conversely,increasing the degeneracy factor strengthens the metallic characteristics,thereby disrupting the high-frequency photonic bandgap.Notably,the defect layer thickness and incident angle exert significant influence on the transmission behavior:a larger incident angle causes the defect peak to shift toward higher frequencies and reduces its intensity,whereas a thicker defect layer shifts the defect peak toward lower frequencies.The modulation effects of both parameters become more pronounced as frequency increases.Compared with conventional photonic crystals,our work can provide a tunable structure over transmission properties,offering novel strategies for designing tunable filters and optical sensors. 展开更多
关键词 one-dimensional photonic crystal Dirac semimetal tunability THz
暂未订购 下载PDF
非线性Dirac方程的隐式傅里叶拟谱格式及其数值验证 认领 引用
9
作者 李运莉 谢耀英 《南方金属》 CAS 2026年第1期65-67,共3页
本文对一类具有周期边界条件的非线性Dirac方程提出并探究一种有限差分傅里叶拟谱算法。先在空间上使用傅里叶拟谱法对相应的方程进行离散化,其次在时间上用有限差分的方法进行近似,建立出一种隐式的数值格式。在一般范数下,所建立的数... 本文对一类具有周期边界条件的非线性Dirac方程提出并探究一种有限差分傅里叶拟谱算法。先在空间上使用傅里叶拟谱法对相应的方程进行离散化,其次在时间上用有限差分的方法进行近似,建立出一种隐式的数值格式。在一般范数下,所建立的数值格式在时间上能达到二阶精度,在空间上能达到谱阶精度,且不受网格比的限制。本文对此数值格式的收敛性通过相应的数值实验结果验证理论分析的正确性。 展开更多
关键词 Dirac方程 有限差分法 傅里叶拟谱算法
暂未订购 下载PDF
邪修还是未来?低音炮+DIRAC 认领 引用
10
作者 李渊宏 《视听前线》 2026年第3期69-72,共4页
如果有人让我选出2025年HIFI圈两大邪修,我会这么选:1、DIRAC;2、低音炮。如果有人让我选出2026年HIFI圈未来之星,我会这么选:1、DIRAC;2、低音炮。(其实还有个候补名额就是多声道系统在HIFI的应用,篇幅有限,本文暂时先不讨论这个,集中... 如果有人让我选出2025年HIFI圈两大邪修,我会这么选:1、DIRAC;2、低音炮。如果有人让我选出2026年HIFI圈未来之星,我会这么选:1、DIRAC;2、低音炮。(其实还有个候补名额就是多声道系统在HIFI的应用,篇幅有限,本文暂时先不讨论这个,集中力量说清楚前两点)我生活中也碰到过不少烧友,一听到给HIFI加低音炮就直摇头。 展开更多
关键词 多声道系统 DIRAC 未来之星 HIFI圈 低音炮 烧友
暂未订购 下载PDF
Entanglement Signatures of(2+1)D Dirac Fermions Subjected to Randomness 认领 引用
11
作者 Qijie Zhang Weiwei Chen +2 位作者 Wei Li Qunxiang Li W.Zhu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第10期290-304,共15页
In this work,we investigate disordered Dirac fermions from the perspective of quantum entanglement,which provides a different angle compared to the ordinary perturbative renormalization group(RG)analysis.We consider D... In this work,we investigate disordered Dirac fermions from the perspective of quantum entanglement,which provides a different angle compared to the ordinary perturbative renormalization group(RG)analysis.We consider Dirac fermions subjected to random hopping and random flux,which respectively fall into the chiral Gaussian orthogonal ensemble(cGOE)and chiral Gaussian unitary ensemble(cGUE)universality classes.Existing studies based on perturbative calculations suggest that both types of randomness are marginal.Here,through numerical simulations of the corresponding lattice models,we find that these two different types of randomness exhibit distinct entanglement features,signaling completely different properties in contrast to the perturbative RG analysis.In particular,although the entropy area-law is generally held for both types of randomness,we identify that the subleading term of the entanglement entropy is enhanced by random flux but not by random hopping.This subleading term is known as the entropic F-function in the clean limit without disorder.Our observations indicate that disordered theories in cGOE and cGUE are essentially different,which recalls careful analysis on the RG calculations. 展开更多
关键词 disordered dirac fermions quantum entanglementwhich entanglement perturbative calculations dirac fermions chiral gaussian orthogonal ensemble cgoe random hopping chiral gaussian unitary
暂未订购 下载PDF
Virtual Dirac Monopoles underlying the Nontrivial Phases of Rogue Waves 认领 引用
12
作者 L.-C.Zhao L.-Z.Meng +2 位作者 Y.-H.Qin Z.-Y.Yang J.Liu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第11期9-18,共10页
We uncover the virtual monopoles underlying the nontrivial phases of the one-dimensional nonlinear excitations of rogue waves by extending the Dirac magnetic monopole theory to a complex plane. We find that the densit... We uncover the virtual monopoles underlying the nontrivial phases of the one-dimensional nonlinear excitations of rogue waves by extending the Dirac magnetic monopole theory to a complex plane. We find that the density zeros of the nonlinear waves on the extended complex plane constitute the virtual monopole fields with a quantized flux of elementary π. We then explain the exotic properties of rogue waves by means of a virtual monopole collision mechanism and find that the maximum amplitude amplification ratio and multiple phase steps of the high-order rogue waves are closely related to the number of their contained monopoles. These results open a new avenue for studying topological properties of nonlinear waves and provide an alternative way to understand their dynamics. 展开更多
关键词 dirac magnetic monopole theory complex plane maximum amplitude amplification nonlinear waves density zeros virtual monopoles rogue waves virtual monopole collision mechanism
暂未订购 下载PDF
Non-Hermitian birefringent Dirac fermions driven by electromagnetic fields 认领 引用
13
作者 Kai Liu Wan-Zi Sun +1 位作者 Cheng-Xi Li Wu-Ming Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第7期499-508,共10页
We investigate the behavior of non-Hermitian birefringent Dirac fermions by examining their interaction with electromagnetic fields through renormalization group analysis. Our research reveals that the interplay betwe... We investigate the behavior of non-Hermitian birefringent Dirac fermions by examining their interaction with electromagnetic fields through renormalization group analysis. Our research reveals that the interplay between non-Hermiticity and birefringence leads to distinct behaviors in two and three dimensions, where the system exhibits different fixed points and scaling properties due to dimension-dependent charge renormalization effects. In two dimensions, where the electronic charge remains unrenormalized, the system flows in the deep infrared limit from non-Hermitian birefringent spin-3/2fermions to two copies of non-Hermitian spin-1/2 Dirac fermions, demonstrating a crossover of relativistic liquid and nonrelativistic liquid. In three dimensions, dynamic screening of electromagnetic interactions modifies the logarithmic growth of Fermi velocity, leading to richer quantum corrections while maintaining similar suppression of birefringence in the infrared limit. Our findings provide theoretical insights into the emergence of Lorentz symmetry in non-Hermitian systems,laying theoretical foundations for studying low-energy behavior in other non-Hermitian models. 展开更多
关键词 non-Hermitian birefringent Dirac fermions renormalization group analysis dimension-dependent charge renormalization non-Hermitian Fermi velocity Lorentz symmetry
暂未订购 下载PDF
一类带磁荷规则黑洞的无质量Dirac场扰动似正规模 认领 引用
14
作者 王春艳 梁慧楠 刘化鹏 《渤海大学学报（自然科学版）》 CAS 2025年第1期45-52,共8页
利用一种半经典近似方法——3阶Wentzel-Kramers-Brillouin(WKB)近似,研究一类带磁荷规则黑洞时空中的无质量Dirac场扰动的似正规模,主要讨论了New-class黑洞(ν=1)、Bardeen-class黑洞(ν=2)和Hayward-class黑洞(ν=μ)3种情况.首先给... 利用一种半经典近似方法——3阶Wentzel-Kramers-Brillouin(WKB)近似,研究一类带磁荷规则黑洞时空中的无质量Dirac场扰动的似正规模,主要讨论了New-class黑洞(ν=1)、Bardeen-class黑洞(ν=2)和Hayward-class黑洞(ν=μ)3种情况.首先给出了扰动方程径向分量的类薛定谔方程形式,并分析扰动有效势函数随黑洞背景时空参数及扰动总角量子数的变化情况,分别计算了3个黑洞的无质量Dirac扰动的似正规模频率.通过对黑洞参数的约束,分析了似正规模与黑洞时空背景参数之间的关系.对黑洞系统似正规模的研究有助于对引力波探测理论的分析. 展开更多
关键词 规则黑洞 Dirac场扰动 似正规模 3阶WKB近似
暂未订购 下载PDF
缺陷Dirac梳中波包散射问题的研究 认领 引用
15
作者 邓志姣 程航 +2 位作者 沈咏 施帅 陈平形 《大学物理》 2025年第3期5-7,23,共3页
微观粒子在周期势场中的运动是量子力学和固体物理教学中都会涉及到的重要内容.本文基于缺陷Dirac梳模型,研究了波包在周期势场中发生散射的能谱结构以及典型特点,可作为量子力学教学内容的延伸,以帮助学生在后续固体物理的学习中建立... 微观粒子在周期势场中的运动是量子力学和固体物理教学中都会涉及到的重要内容.本文基于缺陷Dirac梳模型,研究了波包在周期势场中发生散射的能谱结构以及典型特点,可作为量子力学教学内容的延伸,以帮助学生在后续固体物理的学习中建立清晰的物理图像. 展开更多
关键词 缺陷Dirac梳 传输矩阵 波包散射
暂未订购 下载PDF
弱-(p,k)-Dirac结构 认领 引用
16
作者 毕艳会 陈智雄 《南昌航空大学学报（自然科学版）》 CAS 2025年第2期30-34,共5页
本文研究弱-(p,k)-Dirac结构。首先,在广义直和丛TM⊕∧pT*M上定义∧p-1T*M值配对和高阶Dorfman括号。其次,构造弱-(p,k)-拉格朗日子空间,它比(p,k)-拉格朗日子空间拥有更多的性质。最后,构造光滑流形M上弱-(p,k)-Dirac结构... 本文研究弱-(p,k)-Dirac结构。首先,在广义直和丛TM⊕∧pT*M上定义∧p-1T*M值配对和高阶Dorfman括号。其次,构造弱-(p,k)-拉格朗日子空间,它比(p,k)-拉格朗日子空间拥有更多的性质。最后,构造光滑流形M上弱-(p,k)-Dirac结构,构造弱-(p,k)-Dirac结构的例子以及给出高阶类似的Courant张量。 展开更多
关键词 广义直和丛TM⊕∧pT*M 弱-(p,k)-拉格朗日子空间 (p,k)-拉格朗日子空间 弱-(p,k)-Dirac结构 Courant张量
暂未订购 下载PDF
Tunable reflective spin-decoupled encoding metasurface based on Dirac semimetals 认领 引用
17
作者 HAO Xiao-yu ZHENG Si-yu +6 位作者 WANG Yu LIU Yang LIU Meng ZHANG Yu-ping ZHANG Jin-juan ZHAN Yi ZHANG Hui-yun 《中国光学（中英文）》 EI CAS CSCD 北大核心 2025年第4期968-978,共11页
Multiple functional metasurfaces with high information capacity have attracted considerable attention from researchers.This study proposes a 2-bit tunable spin-decoupled coded metasurface designed for the terahertz ba... Multiple functional metasurfaces with high information capacity have attracted considerable attention from researchers.This study proposes a 2-bit tunable spin-decoupled coded metasurface designed for the terahertz band,which utilizes the tunable properties of Dirac semimetals(DSM)to create a novel multilayer structure.By incorporating both geometric and propagating phases into the metasurface design,we can effectively control the electromagnetic wave.When the Fermi level(EF)of the DSM is set at 6 meV,the electromagnetic wave is manipulated by the gold patch embedded in the DSM film,operating at a frequency of 1.3 THz.When the EF of the DSM is set at 80 meV,the electromagnetic wave is manipulated by the DSM patch,operating at a frequency of 1.4 THz.Both modes enable independent control of beam splitting under left-rotating circularly polarized(LCP)and rightrotating circularly polarized(RCP)wave excitation,resulting in the generation of vortex beams with distinct orbital angular momentum(OAM)modes.The findings of this study hold significant potential for enhancing information capacity and polarization multiplexing techniques in wireless communications. 展开更多
关键词 coding metasurface dirac semimetal spin decoupling circular polarization tunable
暂未订购 下载PDF
Numerical solution of the Dirac equation with scalar,vector,and tensor potentials 认领 引用
18
作者 Alexander Wallén Kiessling Daniel Karlsson +2 位作者 Yuxin Zhao Mário Bettencourt Amaro Chong Qi 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第12期244-250,共7页
Solving the Dirac equation has played an important role in many areas of fundamental physics.In this work,we present the Dirac equation solver DiracSVT,which solves the Dirac equation with scalar,vector,and tensor nuc... Solving the Dirac equation has played an important role in many areas of fundamental physics.In this work,we present the Dirac equation solver DiracSVT,which solves the Dirac equation with scalar,vector,and tensor nuclear potentials in spherical coordinate space.The shooting method was used with a Runge–Kutta 4 integration scheme.The potentials are parameterized in a Woods–Saxon form,which reproduce well the known single-particle states around all doubly magic nuclei and can be applied to study the shell evolution of exotic nuclei.The code can be easily extended to the study of other systems,including atomic,hadron,and molecular physics. 展开更多
关键词 Dirac equation Nuclear physics Scalar Vector and tensor potentials Shell evolution
暂未订购 下载PDF
Isospin splitting of the Dirac mass probed using the relativistic Brueckner-Hartree-Fock theory 认领 引用
19
作者 Pianpian Qin Qiang Zhao +2 位作者 Hui Tong Chencan Wang Sibo Wang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第2期123-130,共8页
The isospin splitting of the Dirac mass obtained using the relativistic Brueckner-Hartree-Fock(RBHF)theory was thor-oughly investigated.From the perspective in the full Dirac space,the long-standing controversy betwee... The isospin splitting of the Dirac mass obtained using the relativistic Brueckner-Hartree-Fock(RBHF)theory was thor-oughly investigated.From the perspective in the full Dirac space,the long-standing controversy between the momentum-independent approximation(MIA)method and the projection method on the isospin splitting of the Dirac mass in asymmetric nuclear matter was analyzed in detail.We found that the assumption procedure of the MIA method,which assumes that single-particle potentials are momentum independent,is not a sufficient condition that directly leads to the opposite sign of the isospin splitting of the Dirac mass,whereas the extraction procedure of the MIA method,which extracts single-particle potentials from single-particle potential energy,changes the sign.A formal expression of the Dirac mass was obtained by approximately solving a set of equations involved in the extraction procedure.The opposite isospin splitting of the Dirac mass was mainly caused by the extraction procedure,which forcibly assumed that the momentum dependence of the single-particle potential energy was in a quadratic form,in which the strength was solely determined by a constant scalar potential.Improved understanding of the isospin splitting of the Dirac mass from ab initio calculations could enhance our knowledge of neutron-rich systems,such as exotic nuclei and neutron stars. 展开更多
关键词 Dirac mass Relativistic Brueckner-Hartree-Fock theory Single-particle potential Momentum dependence
暂未订购 下载PDF
Tunable mid-infrared absorber based on Dirac metamaterials 认领 引用
20
作者 Bo Li Guolun Cheng +2 位作者 Bo Sun Yingying Yu Wenxing Yang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2025年第3期180-188,共9页
In this paper,a tunable metamaterial absorber based on a Dirac semimetal is proposed.It consists of three different structures,from top to bottom,namely a double semicircular Dirac semimetal resonator,a silicon dioxid... In this paper,a tunable metamaterial absorber based on a Dirac semimetal is proposed.It consists of three different structures,from top to bottom,namely a double semicircular Dirac semimetal resonator,a silicon dioxide substrate and a continuous vanadium dioxide(VO2)reflector layer.When the Fermi energy level of the Dirac semimetal is 10 meV,the absorber absorbs more than 90%in the 39.06-84.76 THz range.Firstly,taking advantage of the tunability of the conductivity of the Dirac semimetal,dynamic tuning of the absorption frequency can be achieved by changing the Fermi energy level of the Dirac semimetal without the need to optimise the geometry and remanufacture the structure.Secondly,the structure has been improved by the addition of the phase change material VO2,resulting in a much higher absorption performance of the absorber.Since VO2is a temperature-sensitive metal oxide with an insulating phase below the phase transition temperature(about 68℃)and a metallic phase above the phase transition temperature,this paper also analyses the effect of VO2on the absorptive performance at different temperatures,with the aim of further improving absorber performance. 展开更多
关键词 Dirac metamaterials tunable metamaterials phase change material VO2 absorbs mid-infrared
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 68 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈