Z(2) Invariance of Germanene on MoS2 from First Principles

Autor(en)

Taher Amlaki, Menno Bokdam, Paul J. Kelly

Abstrakt

We present a low energy Hamiltonian generalized to describe how the energy bands of germanene ((Ge) over bar) are modified by interaction with a substrate or a capping layer. The parameters that enter the Hamiltonian are determined from first-principles relativistic calculations for (Ge) over bar vertical bar MoS2 bilayers and MoS2 vertical bar(Ge) over bar vertical bar MoS2 trilayers and are used to determine the topological nature of the system. For the lowest energy, buckled germanene structure, the gap depends strongly on how germanene is oriented with respect to the MoS2 layer(s). Topologically nontrivial gaps for bilayers and trilayers can be almost as large as for a freestanding germanene layer.

Organisation(en)

Computergestützte Materialphysik

Externe Organisation(en)

University of Twente

Journal

Physical Review Letters

Band

116

Anzahl der Seiten

6

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.116.256805

Publikationsdatum

06-2016

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik, 103036 Theoretische Physik, 103015 Kondensierte Materie, 103009 Festkörperphysik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f4369ee4-08a3-4ae1-a306-3cc1941eac4a