Dual quantum confinement and anisotropic spin splitting in the multivalley semimetal PtSe2

O. J. Clark; F. Mazzola; J. Feng; V. Sunko; I. Marković; L. Bawden; Timur K. Kim; P. D.C. King; M. S. Bahramy

doi:10.1103/PhysRevB.99.045438

Dual quantum confinement and anisotropic spin splitting in the multivalley semimetal PtSe2

O. J. Clark, F. Mazzola, J. Feng, V. Sunko, I. Marković, L. Bawden, Timur K. Kim, P. D.C. King, M. S. Bahramy

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

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.

Original language	English
Article number	045438
Journal	Physical Review B
Volume	99
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.99.045438
Publication status	Published - 25 Jan 2019

Bibliographical note

Funding Information:
We thank M. D. Watson for useful discussions. We gratefully acknowledge support from the Leverhulme Trust (Grant No. RL-2016-006), the Royal Society, the European Research Council (Grant No. ERC-714193-QUESTDO), the UK Engineering and Physical Sciences Research Council (Grant No. EP/I031014/1) CREST, JST (No. JPMJCR16F1), and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. O.J.C., V.S., and L.B. acknowledge EPSRC for support through Grants No. EP/K503162/1, EP/L015110/1 and EP/G03673X/1. I.M. acknowledges support from the IMPRS for the Chemistry and Physics of Quantum Materials. We thank Diamond Light Source (via Proposals No. SI13438-1, No. SI16262-2, and No. SI18705-1) for access to the I05 beam line that contributed to the results presented here.

Publisher Copyright:
© 2019 American Physical Society.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Cite this

@article{408f816086214156a5f244d4adbf3405,

title = "Dual quantum confinement and anisotropic spin splitting in the multivalley semimetal PtSe2",

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.",

author = "Clark, \{O. J.\} and F. Mazzola and J. Feng and V. Sunko and I. Markovi{\'c} and L. Bawden and Kim, \{Timur K.\} and King, \{P. D.C.\} and Bahramy, \{M. S.\}",

note = "Funding Information: We thank M. D. Watson for useful discussions. We gratefully acknowledge support from the Leverhulme Trust (Grant No. RL-2016-006), the Royal Society, the European Research Council (Grant No. ERC-714193-QUESTDO), the UK Engineering and Physical Sciences Research Council (Grant No. EP/I031014/1) CREST, JST (No. JPMJCR16F1), and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. O.J.C., V.S., and L.B. acknowledge EPSRC for support through Grants No. EP/K503162/1, EP/L015110/1 and EP/G03673X/1. I.M. acknowledges support from the IMPRS for the Chemistry and Physics of Quantum Materials. We thank Diamond Light Source (via Proposals No. SI13438-1, No. SI16262-2, and No. SI18705-1) for access to the I05 beam line that contributed to the results presented here. Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

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doi = "10.1103/PhysRevB.99.045438",

language = "English",

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T1 - Dual quantum confinement and anisotropic spin splitting in the multivalley semimetal PtSe2

AU - Clark, O. J.

AU - Mazzola, F.

AU - Feng, J.

AU - Sunko, V.

AU - Marković, I.

AU - Bawden, L.

AU - Kim, Timur K.

AU - King, P. D.C.

AU - Bahramy, M. S.

N1 - Funding Information: We thank M. D. Watson for useful discussions. We gratefully acknowledge support from the Leverhulme Trust (Grant No. RL-2016-006), the Royal Society, the European Research Council (Grant No. ERC-714193-QUESTDO), the UK Engineering and Physical Sciences Research Council (Grant No. EP/I031014/1) CREST, JST (No. JPMJCR16F1), and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. O.J.C., V.S., and L.B. acknowledge EPSRC for support through Grants No. EP/K503162/1, EP/L015110/1 and EP/G03673X/1. I.M. acknowledges support from the IMPRS for the Chemistry and Physics of Quantum Materials. We thank Diamond Light Source (via Proposals No. SI13438-1, No. SI16262-2, and No. SI18705-1) for access to the I05 beam line that contributed to the results presented here. Publisher Copyright: © 2019 American Physical Society.

PY - 2019/1/25

Y1 - 2019/1/25

N2 - 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.

AB - 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.

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Dual quantum confinement and anisotropic spin splitting in the multivalley semimetal PtSe2

Abstract

Bibliographical note

ASJC Scopus subject areas

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