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Optical Selection Rule of Excitons in Gapped Chiral Fermion Systems

We show that the exciton optical selection rule in gapped chiral fermion systems is governed by their winding number w, a topological quantity of the Bloch bands. Specifically, in a CN-invariant chiral fermion system, the angular momentum of bright exciton states is given by w ± 1 + nN with n being... Full description

Journal Title: Physical Review Letters Feb 16, 2018, Vol.120(7), p.077401
Main Author: Zhang, Xiaoou
Other Authors: Shan, Wen-Yu , Xiao, Di
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0031-9007 ; E-ISSN: 1079-7114
Link: http://search.proquest.com/docview/2124786329/?pq-origsite=primo
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recordid: proquest2124786329
title: Optical Selection Rule of Excitons in Gapped Chiral Fermion Systems
format: Article
creator:
  • Zhang, Xiaoou
  • Shan, Wen-Yu
  • Xiao, Di
subjects:
  • Molybdenum Disulfide
  • Angular Momentum
  • Winding
  • Excitons
ispartof: Physical Review Letters, Feb 16, 2018, Vol.120(7), p.077401
description: We show that the exciton optical selection rule in gapped chiral fermion systems is governed by their winding number w, a topological quantity of the Bloch bands. Specifically, in a CN-invariant chiral fermion system, the angular momentum of bright exciton states is given by w ± 1 + nN with n being an integer. We demonstrate our theory by proposing two chiral fermion systems capable of hosting dark s-like excitons: gapped surface states of a topological crystalline insulator with C4 rotational symmetry and biased 3R-stacked MoS2 bilayers. In the latter case, we show that gating can be used to tune the s-like excitons from bright to dark by changing the winding number. Our theory thus provides a pathway to electrical control of optical transitions in two-dimensional material.
language: eng
source:
identifier: ISSN: 0031-9007 ; E-ISSN: 1079-7114
fulltext: fulltext
issn:
  • 00319007
  • 0031-9007
  • 10797114
  • 1079-7114
url: Link


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titleOptical Selection Rule of Excitons in Gapped Chiral Fermion Systems
creatorZhang, Xiaoou ; Shan, Wen-Yu ; Xiao, Di
ispartofPhysical Review Letters, Feb 16, 2018, Vol.120(7), p.077401
identifierISSN: 0031-9007 ; E-ISSN: 1079-7114
subjectMolybdenum Disulfide ; Angular Momentum ; Winding ; Excitons
descriptionWe show that the exciton optical selection rule in gapped chiral fermion systems is governed by their winding number w, a topological quantity of the Bloch bands. Specifically, in a CN-invariant chiral fermion system, the angular momentum of bright exciton states is given by w ± 1 + nN with n being an integer. We demonstrate our theory by proposing two chiral fermion systems capable of hosting dark s-like excitons: gapped surface states of a topological crystalline insulator with C4 rotational symmetry and biased 3R-stacked MoS2 bilayers. In the latter case, we show that gating can be used to tune the s-like excitons from bright to dark by changing the winding number. Our theory thus provides a pathway to electrical control of optical transitions in two-dimensional material.
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abstractWe show that the exciton optical selection rule in gapped chiral fermion systems is governed by their winding number w, a topological quantity of the Bloch bands. Specifically, in a CN-invariant chiral fermion system, the angular momentum of bright exciton states is given by w ± 1 + nN with n being an integer. We demonstrate our theory by proposing two chiral fermion systems capable of hosting dark s-like excitons: gapped surface states of a topological crystalline insulator with C4 rotational symmetry and biased 3R-stacked MoS2 bilayers. In the latter case, we show that gating can be used to tune the s-like excitons from bright to dark by changing the winding number. Our theory thus provides a pathway to electrical control of optical transitions in two-dimensional material.
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pubAmerican Physical Society
urlhttp://search.proquest.com/docview/2124786329/
pages077401
doi10.1103/PhysRevLett.120.077401
date2018-02-16