Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Chang, Hao-Ran"'
Publikováno v:
Phys. Rev. B 108, 195427 (2023)
Within linear response theory, the absorptive part of highly anisotropic optical conductivities are analytically calculated for distinct tilts in two-dimensional (2D) tilted semi-Dirac bands (SDBs). The transverse optical conductivities always vanish
Externí odkaz:
http://arxiv.org/abs/2303.18155
The unified form of longitudinal optical conductivities (LOCs) in the tilted Weyl fermions for arbitrary spatial dimensionality are analytically calculated and expressed in terms of the joint density of state. The results are valid for both undoped a
Externí odkaz:
http://arxiv.org/abs/2211.15357
Autor:
Yan, Chang-Xu, Zhang, Furu, Tan, Chao-Yang, Chang, Hao-Ran, Zhou, Jianhui, Yao, Yugui, Guo, Hong
The over-tilting of type-II Dirac cones has led to various fascinating quantum phenomena. Here we find two anomalous acoustic plasmons (AAPs) are dictated by the distinct geometry of two-dimensional (2D) type-II Dirac cones, far beyond the convention
Externí odkaz:
http://arxiv.org/abs/2211.11266
Recent experiments have established a type of nonsymmorphic symmetry protected nodal lines in the family of two-dimensional (2D) composition tunable materials NbSi$_x$Te$_2$. Here, we theoretically study the plasmonic properties of such nonsymmorphic
Externí odkaz:
http://arxiv.org/abs/2211.03621
Autor:
Hou, Jian-Tong, Yan, Chang-Xu, Tan, Chao-Yang, Li, Zhi-Qiang, Wang, Peng, Guo, Hong, Chang, Hao-Ran
Publikováno v:
Phys. Rev. B 108, 035407 (2023)
We report a unified theory based on linear response, for analyzing the longitudinal optical conductivity (LOC) of materials with tilted Dirac cones. Depending on the tilt parameter $t$, the Dirac electrons have four phases: untilted, type-I, type-II,
Externí odkaz:
http://arxiv.org/abs/2210.10410
Publikováno v:
Phys. Rev. B 106, 165404 (2022)
Lifshitz transition is a kind of topological phase transition in which the Fermi surface is reconstructed. It can occur in the two-dimensional (2D) tilted Dirac materials when the energy bands change between the type-I phase ($0
Externí odkaz:
http://arxiv.org/abs/2112.09392
Publikováno v:
Phys. Rev. B 103, 125425 (2021)
1T$^\prime$-MoS$_2$ exhibits valley-spin-polarized tilted Dirac bands in the presence of external vertical electric field and undergoes a topological phase transition between the topological insulator and band insulator around the critical value of t
Externí odkaz:
http://arxiv.org/abs/2012.11885
Autor:
Chang, Hao-Ran
The \emph{conventional} Passarino-Veltman reduction (CPVR) is a systematic procedure based on the Lorentz symmetry, which can efficiently reduce the one-loop Feynman integrals (OLFIs) in the relativistic quantum field theories (RQFTs) at zero tempera
Externí odkaz:
http://arxiv.org/abs/2008.11314
Autor:
Zhou, Jianhui, Chang, Hao-Ran
Publikováno v:
Phys. Rev. B 97, 075202 (2018)
We present a unified derivation of the dynamical correlation functions including density-density, density-current and current-current, of three-dimensional Weyl/Dirac semimetals by use of the Passarino-Veltman reduction scheme at zero temperature. Th
Externí odkaz:
http://arxiv.org/abs/1711.01031
Publikováno v:
Phys. Rev. B 96, 115204 (2017)
We theoretically study the impacts of linear spin-orbit coupling (SOC) on the Ruderman-Kittel-Kasuya-Yosida interaction between magnetic impurities in two kinds of three-dimensional noncentrosymmetric systems. It has been found that linear SOCs lead
Externí odkaz:
http://arxiv.org/abs/1707.02381