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Dual quantum confinement and anisotropic spin splitting in the multivalley semimetal PtSe 2

DOI: 10.1103/PhysRevB.99.045438 DOI Help

Authors: O. J. Clark (University of St. Andrews) , F. Mazzola (University of St. Andrews) , J. Feng (University of St. Andrews; Suzhou Institute of Nano-Tech. and Nanobionics (SINANO)) , V. Sunko (University of St. Andrews; Max Planck Institute for Chemical Physics of Solids) , Igor Markovic (University of St. Andrews; Max Planck Institute for Chemical Physics of Solids) , L. Bawden (University of St. Andrews) , T. K. Kim (Diamond Light Source) , P. D. C. King (University of St. Andrews) , M. S. Bahramy (The University of Tokyo; RIKEN center for Emergent Matter Science (CEMS))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 99

State: Published (Approved)
Published: January 2019
Diamond Proposal Number(s): 13438 , 16262 , 18705

Abstract: We investigate the electronic structure of a two-dimensional electron gas created at the surface of the multivalley semimetal 1T−PtSe2. Using angle-resolved photoemission and first-principles-based surface space-charge calculations, we show how the induced quantum well sub-band states form multiple Fermi surfaces, which exhibit highly anisotropic Rashba-like spin splittings. We further show how the presence of both electronlike and holelike bulk carriers causes the near-surface band bending potential to develop an unusual nonmonotonic form, with spatially segregated electron accumulation and hole accumulation regions, which in turn amplifies the induced spin splitting. Our results thus demonstrate the novel environment that semimetals provide for tailoring electrostatically induced potential profiles and their corresponding quantum sub-band states.

Journal Keywords: Electronic structure; Spin-orbit coupling; Semimetals; Two-dimensional electron gas; Angle-resolved photoemission spectroscopy; Density functional theory

Subject Areas: Materials, Physics


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