Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells

Fabrizio Nichele; Morten Kjærgaard; Henri Juhani Suominen; Rafal Skolasinski; Michael Wimmer; Binh-Minh Nguyen; Andrey A. Kiselev; Marko Sokolich; Michael J. Manfra; Fanming Qu; Arjan J.A. Beukman; Leo P. Kouwenhoven; Charles M. Marcus

doi:10.1103/PhysRevLett.118.016801

Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells

Fabrizio Nichele, Morten Kjærgaard, Henri Juhani Suominen, Rafal Skolasinski, Michael Wimmer, Binh-Minh Nguyen, Andrey A. Kiselev, Marko Sokolich, Michael J. Manfra, Fanming Qu, Arjan J.A. Beukman, Leo P. Kouwenhoven, Charles M. Marcus

Condensed Matter Physics

24 Citations (Scopus)

Abstract

Transport measurements in inverted InAs/GaSb quantum wells reveal a giant spin-orbit splitting of the energy bands close to the hybridization gap. The splitting results from the interplay of electron-hole mixing and spin-orbit coupling, and can exceed the hybridization gap. We experimentally investigate the band splitting as a function of top gate voltage for both electronlike and holelike states. Unlike conventional, noninverted two-dimensional electron gases, the Fermi energy in InAs/GaSb can cross a single spin-resolved band, resulting in full spin-orbit polarization. In the fully polarized regime we observe exotic transport phenomena such as quantum Hall plateaus evolving in e2/h steps and a nontrivial Berry phase.

Original language	English
Article number	016801
Journal	Physical Review Letters
Volume	118
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.118.016801
Publication status	Published - 5 Jan 2017

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title = "Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells",

abstract = "Transport measurements in inverted InAs/GaSb quantum wells reveal a giant spin-orbit splitting of the energy bands close to the hybridization gap. The splitting results from the interplay of electron-hole mixing and spin-orbit coupling, and can exceed the hybridization gap. We experimentally investigate the band splitting as a function of top gate voltage for both electronlike and holelike states. Unlike conventional, noninverted two-dimensional electron gases, the Fermi energy in InAs/GaSb can cross a single spin-resolved band, resulting in full spin-orbit polarization. In the fully polarized regime we observe exotic transport phenomena such as quantum Hall plateaus evolving in e2/h steps and a nontrivial Berry phase.",

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T1 - Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells

AU - Nichele, Fabrizio

AU - Kjærgaard, Morten

AU - Suominen, Henri Juhani

AU - Skolasinski, Rafal

AU - Wimmer, Michael

AU - Nguyen, Binh-Minh

AU - Kiselev, Andrey A.

AU - Sokolich, Marko

AU - Manfra, Michael J.

AU - Qu, Fanming

AU - Beukman, Arjan J.A.

AU - Kouwenhoven, Leo P.

AU - Marcus, Charles M.

N1 - [Qdev]

PY - 2017/1/5

Y1 - 2017/1/5

N2 - Transport measurements in inverted InAs/GaSb quantum wells reveal a giant spin-orbit splitting of the energy bands close to the hybridization gap. The splitting results from the interplay of electron-hole mixing and spin-orbit coupling, and can exceed the hybridization gap. We experimentally investigate the band splitting as a function of top gate voltage for both electronlike and holelike states. Unlike conventional, noninverted two-dimensional electron gases, the Fermi energy in InAs/GaSb can cross a single spin-resolved band, resulting in full spin-orbit polarization. In the fully polarized regime we observe exotic transport phenomena such as quantum Hall plateaus evolving in e2/h steps and a nontrivial Berry phase.

AB - Transport measurements in inverted InAs/GaSb quantum wells reveal a giant spin-orbit splitting of the energy bands close to the hybridization gap. The splitting results from the interplay of electron-hole mixing and spin-orbit coupling, and can exceed the hybridization gap. We experimentally investigate the band splitting as a function of top gate voltage for both electronlike and holelike states. Unlike conventional, noninverted two-dimensional electron gases, the Fermi energy in InAs/GaSb can cross a single spin-resolved band, resulting in full spin-orbit polarization. In the fully polarized regime we observe exotic transport phenomena such as quantum Hall plateaus evolving in e2/h steps and a nontrivial Berry phase.

U2 - 10.1103/PhysRevLett.118.016801

DO - 10.1103/PhysRevLett.118.016801

M3 - Journal article

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SN - 0031-9007

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

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ER -

Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells

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