Spin transport in polarization induced two-dimensional electron gas channel in c-GaN nano-wedges

Abstract A two-dimensional electron gas (2DEG), which has recently been shown to develop in the central vertical plane of a wedge-shaped c-oriented GaN nanowall due to spontaneous polarization effect, offers a unique scenario, where the symmetry between the conduction and valence band is preserved o...

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Autores principales: Swarup Deb, Subhabrata Dhar
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/590719b6bfd042c199a353e33ddc11d2
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spelling oai:doaj.org-article:590719b6bfd042c199a353e33ddc11d22021-12-02T13:20:04ZSpin transport in polarization induced two-dimensional electron gas channel in c-GaN nano-wedges10.1038/s41598-021-84451-y2045-2322https://doaj.org/article/590719b6bfd042c199a353e33ddc11d22021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84451-yhttps://doaj.org/toc/2045-2322Abstract A two-dimensional electron gas (2DEG), which has recently been shown to develop in the central vertical plane of a wedge-shaped c-oriented GaN nanowall due to spontaneous polarization effect, offers a unique scenario, where the symmetry between the conduction and valence band is preserved over the entire confining potential. This results in the suppression of Rashba coupling even when the shape of the wedge is not symmetric. Here, for such a 2DEG channel, relaxation time for different spin projections is calculated as a function of donor concentration and gate bias. Our study reveals a strong dependence of the relaxation rate on the spin-orientation and density of carriers in the channel. Most interestingly, relaxation of spin oriented along the direction of confinement has been found to be completely switched off. Upon applying a suitable bias at the gate, the process can be switched on again. Exploiting this fascinating effect, an electrically driven spin-transistor has been proposed.Swarup DebSubhabrata DharNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Swarup Deb
Subhabrata Dhar
Spin transport in polarization induced two-dimensional electron gas channel in c-GaN nano-wedges
description Abstract A two-dimensional electron gas (2DEG), which has recently been shown to develop in the central vertical plane of a wedge-shaped c-oriented GaN nanowall due to spontaneous polarization effect, offers a unique scenario, where the symmetry between the conduction and valence band is preserved over the entire confining potential. This results in the suppression of Rashba coupling even when the shape of the wedge is not symmetric. Here, for such a 2DEG channel, relaxation time for different spin projections is calculated as a function of donor concentration and gate bias. Our study reveals a strong dependence of the relaxation rate on the spin-orientation and density of carriers in the channel. Most interestingly, relaxation of spin oriented along the direction of confinement has been found to be completely switched off. Upon applying a suitable bias at the gate, the process can be switched on again. Exploiting this fascinating effect, an electrically driven spin-transistor has been proposed.
format article
author Swarup Deb
Subhabrata Dhar
author_facet Swarup Deb
Subhabrata Dhar
author_sort Swarup Deb
title Spin transport in polarization induced two-dimensional electron gas channel in c-GaN nano-wedges
title_short Spin transport in polarization induced two-dimensional electron gas channel in c-GaN nano-wedges
title_full Spin transport in polarization induced two-dimensional electron gas channel in c-GaN nano-wedges
title_fullStr Spin transport in polarization induced two-dimensional electron gas channel in c-GaN nano-wedges
title_full_unstemmed Spin transport in polarization induced two-dimensional electron gas channel in c-GaN nano-wedges
title_sort spin transport in polarization induced two-dimensional electron gas channel in c-gan nano-wedges
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/590719b6bfd042c199a353e33ddc11d2
work_keys_str_mv AT swarupdeb spintransportinpolarizationinducedtwodimensionalelectrongaschannelincgannanowedges
AT subhabratadhar spintransportinpolarizationinducedtwodimensionalelectrongaschannelincgannanowedges
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