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Title: All-optical materials design of chiral edge modes in transition-metal dichalcogenides

Abstract

Monolayer transition-metal dichalcogenides are novel materials which at low energies constitute a condensed-matter realization of massive relativistic fermions in two dimensions. Here, we show that this picture breaks for optical pumping—instead, the added complexity of a realistic materials description leads to a new mechanism to optically induce topologically protected chiral edge modes, facilitating optically switchable conduction channels that are insensitive to disorder. In contrast to graphene and previously discussed toy models, the underlying mechanism relies on the intrinsic three-band nature of transition-metal dichalcogenide monolayers near the band edges. Photo-induced band inversions scale linearly in applied pump field and exhibit transitions from one to two chiral edge modes on sweeping from red to blue detuning. As a result, we develop an ab initio strategy to understand non-equilibrium Floquet–Bloch bands and topological transitions, and illustrate for WS 2 that control of chiral edge modes can be dictated solely from symmetry principles and is not qualitatively sensitive to microscopic materials details.

Authors:
 [1];  [1]; ORCiD logo [2];  [1]
  1. SLAC National Accelerator Lab. and Stanford Univ., Stanford, CA (United States)
  2. SLAC National Accelerator Lab. and Stanford Univ., Stanford, CA (United States); Univ. of North Dakota, Grand Forks, ND (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1348405
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; theory and computation

Citation Formats

Claassen, Martin, Jia, Chunjing, Moritz, Brian, and Devereaux, Thomas P. All-optical materials design of chiral edge modes in transition-metal dichalcogenides. United States: N. p., 2016. Web. doi:10.1038/ncomms13074.
Claassen, Martin, Jia, Chunjing, Moritz, Brian, & Devereaux, Thomas P. All-optical materials design of chiral edge modes in transition-metal dichalcogenides. United States. doi:10.1038/ncomms13074.
Claassen, Martin, Jia, Chunjing, Moritz, Brian, and Devereaux, Thomas P. Mon . "All-optical materials design of chiral edge modes in transition-metal dichalcogenides". United States. doi:10.1038/ncomms13074. https://www.osti.gov/servlets/purl/1348405.
@article{osti_1348405,
title = {All-optical materials design of chiral edge modes in transition-metal dichalcogenides},
author = {Claassen, Martin and Jia, Chunjing and Moritz, Brian and Devereaux, Thomas P.},
abstractNote = {Monolayer transition-metal dichalcogenides are novel materials which at low energies constitute a condensed-matter realization of massive relativistic fermions in two dimensions. Here, we show that this picture breaks for optical pumping—instead, the added complexity of a realistic materials description leads to a new mechanism to optically induce topologically protected chiral edge modes, facilitating optically switchable conduction channels that are insensitive to disorder. In contrast to graphene and previously discussed toy models, the underlying mechanism relies on the intrinsic three-band nature of transition-metal dichalcogenide monolayers near the band edges. Photo-induced band inversions scale linearly in applied pump field and exhibit transitions from one to two chiral edge modes on sweeping from red to blue detuning. As a result, we develop an ab initio strategy to understand non-equilibrium Floquet–Bloch bands and topological transitions, and illustrate for WS2 that control of chiral edge modes can be dictated solely from symmetry principles and is not qualitatively sensitive to microscopic materials details.},
doi = {10.1038/ncomms13074},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Mon Oct 10 00:00:00 EDT 2016},
month = {Mon Oct 10 00:00:00 EDT 2016}
}

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Cited by: 9 works
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Works referenced in this record:

Observation of Floquet-Bloch States on the Surface of a Topological Insulator
journal, October 2013

  • Wang, Y. H.; Steinberg, H.; Jarillo-Herrero, P.
  • Science, Vol. 342, Issue 6157, p. 453-457
  • DOI: 10.1126/science.1239834