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Title: Topological resonance and single-optical-cycle valley polarization in gapped graphene

Abstract

For gapped graphene, we predict that an intense ultrashort (single-oscillation) circularly polarized optical pulse can induce a large population of the conduction band and a large valley polarization. With an increase in the band gap, the magnitude of the valley polarization gradually increases from zero (for the native gapless graphene) to a value on the order of unity. The energy bandwidth of the electrons excited into the conduction band can be very large (≳10 eV for a reasonable pulse amplitude of ~0.5 V/Å). These phenomena are due to the effect of topological resonance: The matching of the topological (geometric) phase and the dynamic phase. Gapped graphene with a tunable band gap can be used as a convenient generic model of two-dimensional semiconductors with honeycomb generic lattice structures and broken inversion symmetry, such as transition-metal dichalcogenides.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. Georgia State Univ., Atlanta, GA (United States)
Publication Date:
Research Org.:
Georgia State Univ., Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1609353
Grant/Contract Number:  
FG02-01ER15213; SC0007043
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Ultrafast optics; Ultrafast phenomena; Valleytronics; Graphene

Citation Formats

Oliaei Motlagh, S. Azar, Nematollahi, Fatemeh, Apalkov, Vadym, and Stockman, Mark I. Topological resonance and single-optical-cycle valley polarization in gapped graphene. United States: N. p., 2019. Web. https://doi.org/10.1103/physrevb.100.115431.
Oliaei Motlagh, S. Azar, Nematollahi, Fatemeh, Apalkov, Vadym, & Stockman, Mark I. Topological resonance and single-optical-cycle valley polarization in gapped graphene. United States. https://doi.org/10.1103/physrevb.100.115431
Oliaei Motlagh, S. Azar, Nematollahi, Fatemeh, Apalkov, Vadym, and Stockman, Mark I. Fri . "Topological resonance and single-optical-cycle valley polarization in gapped graphene". United States. https://doi.org/10.1103/physrevb.100.115431. https://www.osti.gov/servlets/purl/1609353.
@article{osti_1609353,
title = {Topological resonance and single-optical-cycle valley polarization in gapped graphene},
author = {Oliaei Motlagh, S. Azar and Nematollahi, Fatemeh and Apalkov, Vadym and Stockman, Mark I.},
abstractNote = {For gapped graphene, we predict that an intense ultrashort (single-oscillation) circularly polarized optical pulse can induce a large population of the conduction band and a large valley polarization. With an increase in the band gap, the magnitude of the valley polarization gradually increases from zero (for the native gapless graphene) to a value on the order of unity. The energy bandwidth of the electrons excited into the conduction band can be very large (≳10 eV for a reasonable pulse amplitude of ~0.5 V/Å). These phenomena are due to the effect of topological resonance: The matching of the topological (geometric) phase and the dynamic phase. Gapped graphene with a tunable band gap can be used as a convenient generic model of two-dimensional semiconductors with honeycomb generic lattice structures and broken inversion symmetry, such as transition-metal dichalcogenides.},
doi = {10.1103/physrevb.100.115431},
journal = {Physical Review B},
number = 11,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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    Works referencing / citing this record:

    Ultrafast optical currents in gapped graphene
    journal, November 2019

    • Oliaei Motlagh, S. Azar; Nematollahi, Fatemeh; Mitra, Aranyo
    • Journal of Physics: Condensed Matter, Vol. 32, Issue 6
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