Highly disorder tolerant conductance in complex nanoarchetecture

Date

May 12, 2023

Time

11:00 AM - 12:00 PM

Speaker

Dr. Yu-Jie Zhong

Affiliation

NCKU Taiwan

Language

en

Main Topic

Materialien

Host

Grit Rötzer

Description

In graphene-like ribbon system, the robust topological valley state is a Dirac cone-like ground state which possesses topological merit in electronic transport. They mostly exist at a special interface or boundaries such as the domain walls between AB- and BA-stacked bilayer graphene. In radial superlattice, however, the emergence of robust topological valley states spontaneously occurs due to its intrinsic intersecting of two layers – a unique boundary condition with one closed and two open endpoints. In this work, we developed a semi-analytic model to account for the robustness of electronic transport and interpret the emergence of robust topological valley states in radial superlattice. In two-winding carbon nanoscrolls, a well-built-up radial superlattice, topological valley states occurring naturally due to the scroll boundaries are inherited from graphene nanoribbon. Particularly, we found that not only the number of topological states increases by 300 % but also the electronic transport becomes robust against the material defects when the magnetic flux is applied. Our results offer new pathways for spatially creating topological valley states in the curved graphene-like nanomembrane. The significance of these states is that their nature, number, and also robustness are artificially controllable by magnetic flux which we apply. .

Links

• Seminars at the IFW

Last modified: May 12, 2023, 7:37:40 AM