Rashba spin-orbit interaction enhanced by graphene in-plane deformations
Graphene consists in a single-layer carbon crystal where 2pz electrons display a linear dispersion relation in the vicinity of the Fermi level, conveniently described by a massless Dirac equation in 2+1 spacetime. Spin-orbit effects open a gap in the band structure and offer perspectives for the m...
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| Дата: | 2017 |
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| Формат: | Стаття |
| Мова: | English |
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Інститут фізики конденсованих систем НАН України
2017
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/156964 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Rashba spin-orbit interaction enhanced by graphene in-plane deformations / B. Berche, F. Mireles, E. Medina // Condensed Matter Physics. — 2017. — Т. 20, № 1. — С. 13702: 1–10 . — Бібліогр.: 35 назв. — англ. |
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irk-123456789-1569642019-06-20T01:26:53Z Rashba spin-orbit interaction enhanced by graphene in-plane deformations Berche, B. Mireles, F. Medina, E. Graphene consists in a single-layer carbon crystal where 2pz electrons display a linear dispersion relation in the vicinity of the Fermi level, conveniently described by a massless Dirac equation in 2+1 spacetime. Spin-orbit effects open a gap in the band structure and offer perspectives for the manipulation of the conducting electrons spin. Ways to manipulate spin-orbit couplings in graphene have been generally assessed by proximity effects to metals that do not compromise the mobility of the unperturbed system and are likely to induce strain in the graphene layer. In this work we explore the U(1) × SU(2) gauge fields that result from the uniform stretching of a graphene sheet under a perpendicular electric field. Considering such deformations is particularly relevant due to the counter-intuitive enhancement of the Rashba coupling between 30-50% for small bond deformations well known from tight-binding and DFT calculations. We report the accessible changes that can be operated in the band structure in the vicinity of the K points as a function of the deformation strength and direction. Графен — це моношаровий вуглецевий кристал, де 2pz електрони демонструють лiнiйний закон дисперсiї поблизу рiвня Фермi, що описується безмасовим рiвнянням Дiрака у 2+1 просторi-часi. Спiн-орбiтальнi ефекти вiдкривають щiлину в зоннiй структурi i вказують на перспективи для керування спiном електронiв провiдностi. Способи керування спiн-орбiтальним зв’язком в графенi взагальному визначаються близькiстю ефектiв до металiв, якi не поступаються мобiльнiстю незбуреної системи та ймовiрно iндукують напруження в шарi графену. В цiй роботi ми дослiджуємо U(1)×SU(2) калiбрувальнi поля, якi виникають з однорiдного розтягнення графенового листа пiд дiєю перпендикулярно-направленого електричного поля. Розгляд таких деформацiй є особливо важливим через контрiнтуїтивне пiдсилення зв’язку Рашби в дiапазонi 30-50% для малих деформацiй зв’язкiв, що є добре вiдомим з обчислень в наближеннi сильного зв’язку i з теорiї функцiоналу густини. Ми повiдомляємо досяжнi змiн 2017 Article Rashba spin-orbit interaction enhanced by graphene in-plane deformations / B. Berche, F. Mireles, E. Medina // Condensed Matter Physics. — 2017. — Т. 20, № 1. — С. 13702: 1–10 . — Бібліогр.: 35 назв. — англ. 1607-324X PACS: 72.80.Vp, 75.70.Tj, 11.15.-q DOI:10.5488/CMP.20.13702 arXiv:1701.00363 http://dspace.nbuv.gov.ua/handle/123456789/156964 en Condensed Matter Physics Інститут фізики конденсованих систем НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| description |
Graphene consists in a single-layer carbon crystal where 2pz electrons display a linear dispersion relation in
the vicinity of the Fermi level, conveniently described by a massless Dirac equation in 2+1 spacetime. Spin-orbit
effects open a gap in the band structure and offer perspectives for the manipulation of the conducting electrons
spin. Ways to manipulate spin-orbit couplings in graphene have been generally assessed by proximity effects
to metals that do not compromise the mobility of the unperturbed system and are likely to induce strain in the
graphene layer. In this work we explore the U(1) × SU(2) gauge fields that result from the uniform stretching
of a graphene sheet under a perpendicular electric field. Considering such deformations is particularly relevant
due to the counter-intuitive enhancement of the Rashba coupling between 30-50% for small bond deformations
well known from tight-binding and DFT calculations. We report the accessible changes that can be operated in
the band structure in the vicinity of the K points as a function of the deformation strength and direction. |
| format |
Article |
| author |
Berche, B. Mireles, F. Medina, E. |
| spellingShingle |
Berche, B. Mireles, F. Medina, E. Rashba spin-orbit interaction enhanced by graphene in-plane deformations Condensed Matter Physics |
| author_facet |
Berche, B. Mireles, F. Medina, E. |
| author_sort |
Berche, B. |
| title |
Rashba spin-orbit interaction enhanced by graphene in-plane deformations |
| title_short |
Rashba spin-orbit interaction enhanced by graphene in-plane deformations |
| title_full |
Rashba spin-orbit interaction enhanced by graphene in-plane deformations |
| title_fullStr |
Rashba spin-orbit interaction enhanced by graphene in-plane deformations |
| title_full_unstemmed |
Rashba spin-orbit interaction enhanced by graphene in-plane deformations |
| title_sort |
rashba spin-orbit interaction enhanced by graphene in-plane deformations |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2017 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/156964 |
| citation_txt |
Rashba spin-orbit interaction enhanced by graphene in-plane deformations / B. Berche, F. Mireles, E. Medina // Condensed Matter Physics. — 2017. — Т. 20, № 1. — С. 13702: 1–10
. — Бібліогр.: 35 назв. — англ. |
| series |
Condensed Matter Physics |
| work_keys_str_mv |
AT bercheb rashbaspinorbitinteractionenhancedbygrapheneinplanedeformations AT mirelesf rashbaspinorbitinteractionenhancedbygrapheneinplanedeformations AT medinae rashbaspinorbitinteractionenhancedbygrapheneinplanedeformations |
| first_indexed |
2023-05-20T17:50:55Z |
| last_indexed |
2023-05-20T17:50:55Z |
| _version_ |
1796154232308498432 |