Can I read Signatures of Lifshitz transition in the optical conductivity of two-dimensional tilted Dirac materials on EtoBox?

Signatures of Lifshitz transition in the optical conductivity of two-dimensional tilted Dirac materials by Tan, Chao-Yang; Hou, Jian-Tong; Yan, Chang-Xu; Guo, Hong; Chang, Hao-Ran is a scholarly article available to read on EtoBox.

What is Signatures of Lifshitz transition in the optical conductivity of two-dimensional tilted Dirac materials about?

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 ($0<t<1$) and the type-II phase ($t>1$) through the type-III phase ($t=1$), where different tilts are parametrized by the values of $t$. In order to characterize the Lifshitz transition therein, we theoretically investigate the longitudinal optical conductivities (LOCs) in type-I, type-II, and type-III Dirac materials within linear response theory. In the undoped case, the LOCs are constants either independent of the tilt parameter in both type-I and type-III phases or determined by the tilt parameter in the type-II phase. In the doped case, the LOCs are anisotropic and possess two critical frequencies determined by $\omega=\omega_1(t)$ and $\omega=\omega_2(t)$, which are also confirmed by the joint density of state. The tilt parameter and chemical potential can be extracted from optical experiments by measuring the positions of these two critical boundaries and their separation $\Delta\omega(t)=\omega_2(t)-\omega_1(t)$. With increasing the tilting, the separat

Author

Tan, Chao-Yang; Hou, Jian-Tong; Yan, Chang-Xu; Guo, Hong; Chang, Hao-Ran

Published

2021

Language

EN