Dual quantum confinement and anisotropic spin splitting in the multi-valley semimetal PtSe2
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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.
Clark , O J , Mazzola , F , Feng , J , Sunko , V , Marković , I , Bawden , L , Kim , T K , King , P D & Bahramy , M S 2019 , ' Dual quantum confinement and anisotropic spin splitting in the multi-valley semimetal PtSe 2 ' , Physical Review B , vol. 99 , no. 4 , 045438 . https://doi.org/10.1103/PhysRevB.99.045438
Physical Review B
© 2019, American Physical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevB.99.045438
DescriptionThe authors gratefully acknowledge support from the Leverhulme Trust (Grant No. RL-2016-006), the Royal Society, the European Research Council (Grant No. ERC-714193QUESTDO) CREST, JST (No. JPMJCR16F1), and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. OJC, VS, and LB acknowledge EPSRC for PhD studentship support through grant Nos. EP/K503162/1, EP/L015110/1 and EP/G03673X/1. IM acknowledges PhD studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials.
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