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Yang K, Xu Z, Feng Y, Schindler F, Xu Y, Bi Z, Bernevig BA, Tang P, Liu CX. Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures. Nat Commun 2024; 15:2670. [PMID: 38531879 DOI: 10.1038/s41467-024-46717-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 02/29/2024] [Indexed: 03/28/2024] Open
Abstract
The presence of topological flat minibands in moiré materials provides an opportunity to explore the interplay between topology and correlation. In this work, we study moiré minibands in topological insulator films with two hybridized surface states under a moiré superlattice potential created by two-dimensional insulating materials. We show the lowest conduction (highest valence) Kramers' pair of minibands can beZ 2 non-trivial when the minima (maxima) of moiré potential approximately form a hexagonal lattice with six-fold rotation symmetry. Coulomb interaction can drive the non-trivial Kramers' minibands into the quantum anomalous Hall state when they are half-filled, which is further stabilized by applying external gate voltages to break inversion. We propose the monolayer Sb2 on top of Sb2Te3 films as a candidate based on first principles calculations. Our work demonstrates the topological insulator based moiré heterostructure as a potential platform for studying interacting topological phases.
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Affiliation(s)
- Kaijie Yang
- Department of Physics, the Pennsylvania State University, University Park, PA, 16802, USA
| | - Zian Xu
- School of Materials Science and Engineering, Beihang University, Beijing, 100191, China
| | - Yanjie Feng
- School of Materials Science and Engineering, Beihang University, Beijing, 100191, China
| | - Frank Schindler
- Blackett Laboratory, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Yuanfeng Xu
- Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou, 310058, China
- Department of Physics, Princeton University, Princeton, NJ, 08544, USA
| | - Zhen Bi
- Department of Physics, the Pennsylvania State University, University Park, PA, 16802, USA
| | - B Andrei Bernevig
- Department of Physics, Princeton University, Princeton, NJ, 08544, USA
- Donostia International Physics Center, P. Manuel de Lardizabal 4, 20018, Donostia-San Sebastian, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | - Peizhe Tang
- School of Materials Science and Engineering, Beihang University, Beijing, 100191, China
- Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, 22761, Germany
| | - Chao-Xing Liu
- Department of Physics, the Pennsylvania State University, University Park, PA, 16802, USA.
- Department of Physics, Princeton University, Princeton, NJ, 08544, USA.
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Mihalyuk AN, Bondarenko LV, Tupchaya AY, Gruznev DV, Solovova NY, Golyashov VA, Tereshchenko OE, Okuda T, Kimura A, Eremeev SV, Zotov AV, Saranin AA. Emergence of quasi-1D spin-polarized states in ultrathin Bi films on InAs(111)A for spintronics applications. NANOSCALE 2024; 16:1272-1281. [PMID: 38126765 DOI: 10.1039/d3nr03830k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
The discovery, characterization, and control of heavy-fermion low-dimensional materials are central to nanoscience since quantum phenomena acquire an exotic and highly tunable character. In this work, through a variety of comprehensive experimental and theoretical techniques, it was observed and predicted that the synthesis of ultrathin Bi films on the InAs(111)A surface produces quasi-one-dimensional spin-polarized states, providing a platform for the realization of a unique spin-transport regime in the system. Scanning tunneling microscopy and low-energy electron diffraction measurements revealed that the InAs(111)A substrate facilitates the formation of the Bi-dimer phase of 2√3 × 3 periodicity with an admixture of the Bi-bilayer phase under submonolayer Bi deposition. X-ray photoelectron spectroscopy (XPS) measurements have shown the chemical stability of the Bi-induced phases, while spin and angle resolved photoemission spectroscopy (SARPES) observations combined with state-of-the-art DFT calculations have revealed that the electronic spectrum of the Bi-dimer phase holds a quasi-1D hole-like spin-split state at the Fermi level with advanced spin texture, whereas the Bi-bilayer phase demonstrates metallic states with large Rashba spin-splitting. The band structure of the Bi/InAs(111)A interface is discovered to hold great potential as a high-performance spintronics material fabricated in the ultimate two-dimensional limit.
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Affiliation(s)
- Alexey N Mihalyuk
- Institute of High Technologies and Advanced Materials, Far Eastern Federal University, 690950 Vladivostok, Russia.
- Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia
| | - Leonid V Bondarenko
- Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia
| | - Alexandra Y Tupchaya
- Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia
| | - Dimitry V Gruznev
- Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia
| | | | - Vladimir A Golyashov
- Novosibirsk State University, 630090 Novosibirsk, Russia
- Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Oleg E Tereshchenko
- Novosibirsk State University, 630090 Novosibirsk, Russia
- Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Taichi Okuda
- Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
| | - Akio Kimura
- Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (SKCM2), 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Sergey V Eremeev
- Institute of Strength Physics and Materials Science, Tomsk 634055, Russia
| | - Andrey V Zotov
- Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia
| | - Alexander A Saranin
- Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia
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