Spin-polarization anisotropy controlled by bending in tungsten diselenide nanoribbons and tunable excitonic states

Tang, Hong; Neupane, Santosh; Yin, Li; Breslin, Jason M.; Ruzsinszky, Adrienn

doi:10.1039/d2tc05129j

Title: Spin-polarization anisotropy controlled by bending in tungsten diselenide nanoribbons and tunable excitonic states

Journal Article · Thu Feb 16 00:00:00 EST 2023 · Journal of Materials Chemistry C

DOI:https://doi.org/10.1039/d2tc05129j· OSTI ID:1961769

Tang, Hong ^[1]; Neupane, Santosh ^[1]; Yin, Li ^[1]; Breslin, Jason M. ^[1];

^[1]

Temple Univ., Philadelphia, PA (United States)

A WSe₂ monolayer shows many interesting properties due to its spin-orbit coupling induced spin splitting in bands around the Fermi level and the spin-valley configuration. The orientation of the spin polarization in the relevant bands is crucial for the nature of exciton states and the optical valley selectivity. In this work, we studied the WSe₂ nanoribbons under different mechanical bending curvatures and electron/hole doping with density functional theory and their optical absorption and excitonic states with many-body perturbation GW and BSE (Bethe-Salpeter equation) methods. We found that the WSe₂ nanoribbons can exhibit an enhanced SOC effect and a spatially varying spin polarization in bands around the Fermi level under bending. The spin-polarization can show an anisotropy (or asymmetry) in those nearly degenerate bands, leading to a controllable magnetism via bending and electron/hole doping to the nanoribbons, suggesting a potential application in compact and controllable magnetic nanodevices and spintronics. The optical absorption spectrum of the nanoribbon presents a large tunability with bending within the near infrared region of about 0.4 to 1.5 eV, showing an enhanced absorption at a large bending condition. Finally, the exciton states generally show mixed or various spin configuration in the electron and hole pairs that are controlled by bending, potentially useful for applications in spin-based quantum information processes.

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Research Organization:: Temple Univ., Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); US Army Research Laboratory; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0021263; AC02-05CH11231; W911NF-16-2-0189

OSTI ID:: 1961769

Alternate ID(s):: OSTI ID: 1962893; OSTI ID: 2335783; OSTI ID: 2335845

Journal Information:: Journal of Materials Chemistry C, Vol. 11, Issue 14; ISSN 2050-7526

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
WSe2 nanoribbon
band spin-polarization anisotropy
electron and hole doping
optical absorption
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Title: Spin-polarization anisotropy controlled by bending in tungsten diselenide nanoribbons and tunable excitonic states

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