Charge transfer and spin-valley locking in 4Hb-TaS2

Avior Almoalem; Roni Gofman; Yuval Nitzav; Ilay Mangel; Irena Feldman; Jahyun Koo; Federico Mazzola; Jun Fujii; Ivana Vobornik; J. S´anchez-Barriga; Oliver J. Clark; Nicholas Clark Plumb; Ming Shi; Binghai Yan; Amit Kanigel

doi:https://doi.org/10.1038/s41535-024-00646-2

Charge transfer and spin-valley locking in 4Hb-TaS₂

Avior Almoalem, Roni Gofman, Yuval Nitzav, Ilay Mangel, Irena Feldman, Jahyun Koo, Federico Mazzola, Jun Fujii, Ivana Vobornik, J. S´anchez-Barriga, Oliver J. Clark, Nicholas Clark Plumb, Ming Shi, Binghai Yan, Amit Kanigel

Weizmann Institute of Science, Technion - Israel Institute of Technology

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

Abstract

4Hb-TaS₂ is a superconductor that exhibits unique characteristics such as time-reversal symmetry breaking, hidden magnetic memory, and topological edge modes. It is a naturally occurring heterostructure comprising of alternating layers of 1H-TaS₂ and 1T-TaS₂. The former is a well-known superconductor, while the latter is a correlated insulator with a possible non- trivial magnetic ground state. In this study, we use angle resolved photoemission spectroscopy to investigate the normal state electronic structure of this unconventional superconductor. Our findings reveal that the band structure of 4Hb-TaS₂ fundamentally differs from that of its constituent materials. Specifically, we observe a significant charge transfer from the 1T layers to the 1H layers that drives the 1T layers away from half-filling. In addition, we find a substantial reduction in inter-layer coupling in 4Hb-TaS₂ compared to the coupling in 2H-TaS₂ that results in a pronounced spin-valley locking within 4Hb-TaS₂.

Original language	English
Article number	36
Number of pages	7
Journal	npj Quantum Materials
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41535-024-00646-2
State	Published - 10 Apr 2024

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Charge transfer and spin-valley locking in 4Hb-TaS2",

abstract = "4Hb-TaS2 is a superconductor that exhibits unique characteristics such as time-reversal symmetry breaking, hidden magnetic memory, and topological edge modes. It is a naturally occurring heterostructure comprising of alternating layers of 1H-TaS2 and 1T-TaS2. The former is a well-known superconductor, while the latter is a correlated insulator with a possible non- trivial magnetic ground state. In this study, we use angle resolved photoemission spectroscopy to investigate the normal state electronic structure of this unconventional superconductor. Our findings reveal that the band structure of 4Hb-TaS2 fundamentally differs from that of its constituent materials. Specifically, we observe a significant charge transfer from the 1T layers to the 1H layers that drives the 1T layers away from half-filling. In addition, we find a substantial reduction in inter-layer coupling in 4Hb-TaS2 compared to the coupling in 2H-TaS2 that results in a pronounced spin-valley locking within 4Hb-TaS2.",

author = "Avior Almoalem and Roni Gofman and Yuval Nitzav and Ilay Mangel and Irena Feldman and Jahyun Koo and Federico Mazzola and Jun Fujii and Ivana Vobornik and J. S´anchez-Barriga and Clark, {Oliver J.} and Plumb, {Nicholas Clark} and Ming Shi and Binghai Yan and Amit Kanigel",

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T1 - Charge transfer and spin-valley locking in 4Hb-TaS2

AU - Almoalem, Avior

AU - Gofman, Roni

AU - Nitzav, Yuval

AU - Mangel, Ilay

AU - Feldman, Irena

AU - Koo, Jahyun

AU - Mazzola, Federico

AU - Fujii, Jun

AU - Vobornik, Ivana

AU - S´anchez-Barriga, J.

AU - Clark, Oliver J.

AU - Plumb, Nicholas Clark

AU - Shi, Ming

AU - Yan, Binghai

AU - Kanigel, Amit

PY - 2024/4/10

Y1 - 2024/4/10

N2 - 4Hb-TaS2 is a superconductor that exhibits unique characteristics such as time-reversal symmetry breaking, hidden magnetic memory, and topological edge modes. It is a naturally occurring heterostructure comprising of alternating layers of 1H-TaS2 and 1T-TaS2. The former is a well-known superconductor, while the latter is a correlated insulator with a possible non- trivial magnetic ground state. In this study, we use angle resolved photoemission spectroscopy to investigate the normal state electronic structure of this unconventional superconductor. Our findings reveal that the band structure of 4Hb-TaS2 fundamentally differs from that of its constituent materials. Specifically, we observe a significant charge transfer from the 1T layers to the 1H layers that drives the 1T layers away from half-filling. In addition, we find a substantial reduction in inter-layer coupling in 4Hb-TaS2 compared to the coupling in 2H-TaS2 that results in a pronounced spin-valley locking within 4Hb-TaS2.

AB - 4Hb-TaS2 is a superconductor that exhibits unique characteristics such as time-reversal symmetry breaking, hidden magnetic memory, and topological edge modes. It is a naturally occurring heterostructure comprising of alternating layers of 1H-TaS2 and 1T-TaS2. The former is a well-known superconductor, while the latter is a correlated insulator with a possible non- trivial magnetic ground state. In this study, we use angle resolved photoemission spectroscopy to investigate the normal state electronic structure of this unconventional superconductor. Our findings reveal that the band structure of 4Hb-TaS2 fundamentally differs from that of its constituent materials. Specifically, we observe a significant charge transfer from the 1T layers to the 1H layers that drives the 1T layers away from half-filling. In addition, we find a substantial reduction in inter-layer coupling in 4Hb-TaS2 compared to the coupling in 2H-TaS2 that results in a pronounced spin-valley locking within 4Hb-TaS2.

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ER -

Charge transfer and spin-valley locking in 4Hb-TaS₂

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