Spin-orbit coupled spin-polarised hole gas at the CrSe2-terminated surface of 
AgCrSe2

Siemann, Gesa-R.; Kim, Seo-Jin; Abarca Morales, Edgar; Murgatroyd, Philip A. E.; Zivanovic, Andela; Edwards, Brendan; Marković, Igor; Mazzola, Federico; Trzaska, Liam; Clark, Oliver J.; Bigi, Chiara; Zhang, Haijing; Achinuq, Barat; Hesjedal, Thorsten; Watson, Matthew D.; Kim, Timur K.; Bencok, Peter; van der Laan, Gerrit; Polley, Craig M.; Leandersson, Mats; Fedderwitz, Hanna; Ali, Khadiza; Balasubramanian, Thiagarajan; Schmidt, Marcus; Baenitz, Michael; Rosner, Helge; King, Phil D. C.

doi:10.1038/s41535-023-00593-4

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Spin-orbit coupled spin-polarised hole gas at the CrSe₂-terminated surface of AgCrSe₂

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Kim, Seo-Jin
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Abarca Morales, Edgar
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons287963

Zivanovic, Andela
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons215288

Marković, Igor
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons262754

Zhang, Haijing
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126835

Schmidt, Marcus
Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126528

Baenitz, Michael
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126819

Rosner, Helge
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Siemann, G.-R., Kim, S.-J., Abarca Morales, E., Murgatroyd, P. A. E., Zivanovic, A., Edwards, B., et al. (2023). Spin-orbit coupled spin-polarised hole gas at the CrSe₂-terminated surface of AgCrSe₂. npj Quantum Materials, 8(1): 61, pp. 1-7. doi:10.1038/s41535-023-00593-4.

Cite as: https://hdl.handle.net/21.11116/0000-000D-DD79-3

Abstract

In half-metallic systems, electronic conduction is mediated by a single spin species, offering enormous potential for spintronic devices. Here, using microscopic-area angle-resolved photoemission, we show that a spin-polarised two-dimensional hole gas is naturally realised in the polar magnetic semiconductor AgCrSe2 by an intrinsic self-doping at its CrSe2-terminated surface. Through comparison with first-principles calculations, we unveil a striking role of spin-orbit coupling for the surface hole gas, unlocked by both bulk and surface inversion symmetry breaking, suggesting routes for stabilising complex magnetic textures in the surface layer of AgCrSe2.