Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W17: Topological Materials and Platforms
3:00 PM–5:48 PM,
Thursday, March 7, 2024
Room: M100H
Sponsoring
Unit:
DCMP
Chair: Qunfei Zhou, University of Kansas
Abstract: W17.00008 : Electromagnetic coupling and transport in a topological insulator–graphene heterostructure*
4:24 PM–4:36 PM
Presenter:
Enrique Munoz
(Pontificia Universidad Catolica de Chile)
Authors:
Enrique Munoz
(Pontificia Universidad Catolica de Chile)
Jorge Castaño-Yepes
(Pontificia Universidad Catolica de Chile)
Daniel Bonilla
(Pontificia Universidad Catolica de Chile)
Alberto Martín-Ruiz
(Universidad Autonoma de Mexico)
We consider a heterostructure composed of a TI slab and a single graphene layer, and we further assume that a diluted concentration of ionized impurities is present in the graphene monolayer. The presence of such charged impurities will induce a local distortion of the charge density of the 2D electron gas, leading to a nontrivial electromagnetic coupling between the TI and the graphene monolayer in the heterostructure. As a probe of this coupling, we further studied the electrical conductivity as a function of temperature, by including the scattering effects with the local electromagnetic field configuration via the Kubo linear response formalism. We applied our theoretical results to model the electromagnetic coupling in heterostructures made of different TIs (PbTe, Bi2Te3, PbSe, PbS, Bi2Se3, TlBiSe2, TbPO4). Our analytical and numerical results suggest that, among the properties of the TIs, the dielectric permittivity ε1 is the most relevant at tuning the electronic transport in the coupled graphene monolayer. On the other hand, we also observed that the topological effects arising from the presence of the MEP coefficient θ are comparatively very small even at zero temperature.
*We acknowledge financial support from ANID PIA Anillo ACT/192023, and Fondecyt 1230440
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