Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well

Abstract Band crossings observed in a wide range of condensed matter systems are recognized as a key to understand low-energy fermionic excitations that behave as massless Dirac particles. Despite rapid progress in this field, the exploration of non-equilibrium topological states remains scarce and...

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Autores principales:	Boyuan Zhang, Nobuya Maeshima, Ken-ichi Hino
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a0c74b349d634f5fab561eae89511da6
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spelling	oai:doaj.org-article:a0c74b349d634f5fab561eae89511da62021-12-02T14:06:56ZEdge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well10.1038/s41598-021-82230-32045-2322https://doaj.org/article/a0c74b349d634f5fab561eae89511da62021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82230-3https://doaj.org/toc/2045-2322Abstract Band crossings observed in a wide range of condensed matter systems are recognized as a key to understand low-energy fermionic excitations that behave as massless Dirac particles. Despite rapid progress in this field, the exploration of non-equilibrium topological states remains scarce and it has potential ability of providing a new platform to create unexpected massless Dirac states. Here we show that in a semiconductor quantum-well driven by a cw-laser with linear polarization, the optical Stark effect conducts bulk-band crossing, and the resulting Floquet-Dirac semimetallic phase supports an unconventional edge state in the projected one-dimensional Brillouin zone under a boundary condition that an electron is confined in the direction perpendicular to that of the laser polarization. Further, we reveal that this edge state mediates a transition between topological and non-topological edge states that is caused by tuning the laser intensity. We also show that the properties of the edge states are strikingly changed under a different boundary condition. It is found that such difference originates from that nearly fourfold-degenerate points exist in a certain intermediate region of the bulk Brillouin zone between high-symmetry points.Boyuan ZhangNobuya MaeshimaKen-ichi HinoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Boyuan Zhang Nobuya Maeshima Ken-ichi Hino Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well
description	Abstract Band crossings observed in a wide range of condensed matter systems are recognized as a key to understand low-energy fermionic excitations that behave as massless Dirac particles. Despite rapid progress in this field, the exploration of non-equilibrium topological states remains scarce and it has potential ability of providing a new platform to create unexpected massless Dirac states. Here we show that in a semiconductor quantum-well driven by a cw-laser with linear polarization, the optical Stark effect conducts bulk-band crossing, and the resulting Floquet-Dirac semimetallic phase supports an unconventional edge state in the projected one-dimensional Brillouin zone under a boundary condition that an electron is confined in the direction perpendicular to that of the laser polarization. Further, we reveal that this edge state mediates a transition between topological and non-topological edge states that is caused by tuning the laser intensity. We also show that the properties of the edge states are strikingly changed under a different boundary condition. It is found that such difference originates from that nearly fourfold-degenerate points exist in a certain intermediate region of the bulk Brillouin zone between high-symmetry points.
format	article
author	Boyuan Zhang Nobuya Maeshima Ken-ichi Hino
author_facet	Boyuan Zhang Nobuya Maeshima Ken-ichi Hino
author_sort	Boyuan Zhang
title	Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well
title_short	Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well
title_full	Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well
title_fullStr	Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well
title_full_unstemmed	Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well
title_sort	edge states of floquet–dirac semimetal in a laser-driven semiconductor quantum-well
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a0c74b349d634f5fab561eae89511da6
work_keys_str_mv	AT boyuanzhang edgestatesoffloquetdiracsemimetalinalaserdrivensemiconductorquantumwell AT nobuyamaeshima edgestatesoffloquetdiracsemimetalinalaserdrivensemiconductorquantumwell AT kenichihino edgestatesoffloquetdiracsemimetalinalaserdrivensemiconductorquantumwell
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Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well

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