Twist- and gate-tunable proximity spin-orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition-metal dichalcogenides

URN to cite this document:

urn:nbn:de:bvb:355-epub-551792 Copy

DOI to cite this document:

10.5283/epub.55179 Copy

Zollner, Klaus ; João, Simão M. ; Nikolić, Branislav K. ; Fabian, Jaroslav

License: Creative Commons Attribution 4.0 PDF - Submitted Version (13MB)

Date of publication of this fulltext: 07 Dec 2023 06:05

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• Zollner, Klaus , João, Simão M., Nikolić, Branislav K. and Fabian, Jaroslav (2023) Twist- and gate-tunable proximity spin-orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition-metal dichalcogenides. Phys. Rev. B 108, p. 235166. (Submitted) [Currently displayed]
  • Zollner, Klaus , João, Simão M., Nikolić, Branislav K. and Fabian, Jaroslav (2023) Data Archive of Twist- and gate-tunable proximity spin-orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition-metal dichalcogenides. [Dataset]

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Details

Item type:	Article
Journal or Publication Title:	Phys. Rev. B
Publisher:	American Physical Society
Volume:	108
Page Range:	p. 235166
Date:	22 December 2023
Institutions:	Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian
Identification Number:	Value Type 2310.17907 arXiv ID https://doi.org/10.1103/PhysRevB.108.235166 DOI
Keywords:	spintronics, transition-metal dichalcogenides, heterostructures, proximity spin-orbit coupling
Dewey Decimal Classification:	500 Science > 530 Physics
Status:	Submitted
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Yes
Item ID:	55179

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Abstract

We present a DFT-based investigation of the twist-angle dependent proximity spin-orbit coupling (SOC) in graphene/TMDC structures. We find that for Mo-based TMDCs the proximity valley-Zeeman SOC exhibits a maximum at around 15--20°, and vanishes at 30°, while for W-based TMDCs we find an almost linear decrease of proximity valley-Zeeman SOC when twisting from 0° to 30°. The induced Rashba SOC is ...

Abstract

We present a DFT-based investigation of the twist-angle dependent proximity spin-orbit coupling (SOC) in graphene/TMDC structures. We find that for Mo-based TMDCs the proximity valley-Zeeman SOC exhibits a maximum at around 15--20°, and vanishes at 30°, while for W-based TMDCs we find an almost linear decrease of proximity valley-Zeeman SOC when twisting from 0° to 30°. The induced Rashba SOC is rather insensitive to twisting, while acquiring a nonzero Rashba phase angle, φ∈[−20;40]°, for twist angles different from 0° and 30°. This finding contradicts earlier tight-binding predictions that the Rashba angle can be 90° in the studied systems. In addition, we study the influence of several tunability knobs on the proximity SOC for selected twist angles. By applying a transverse electric field in the limits of ±2 V/nm, mainly the Rashba SOC can be tuned by about 50. The interlayer distance provides a giant tunability, since the proximity SOC can be increased by a factor of 2--3, when reducing the distance by about 10. Encapsulating graphene between two TMDCs, both twist angles are important to control the interference of the individual proximity SOCs, allowing to precisely tailor the valley-Zeeman SOC in graphene, while the Rashba SOC becomes suppressed. Finally, based on our effective Hamiltonians with fitted parameters, we calculate experimentally measurable quantities such as spin lifetime anisotropy and charge-to-spin conversion efficiencies. The spin lifetime anisotropy can become giant, up to 104, in encapsulated structures. The charge-to-spin conversion, which is due to spin-Hall and Rashba-Edelstein effects, can lead to twist-tunable non-equilibrium spin-density polarizations that are perpendicular and parallel to the applied charge current.

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Metadata last modified: 08 Oct 2024 16:21

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