Helical Luttinger Liquid on the Edge of a Two-Dimensional Topological Antiferromagnet.

Autor:	Feng Y; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, People's Republic of China., Zhu J; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, People's Republic of China., Lin W; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, People's Republic of China.; Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai200433, People's Republic of China., Lian Z; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, People's Republic of China., Wang Y; Beijing Innovation Center for Future Chips, Tsinghua University, Beijing100084, People's Republic of China., Li H; School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People's Republic of China.; Tsinghua-Foxconn Nanotechnology Research Center, Department of Physics, Tsinghua University, Beijing100084, People's Republic of China., Yao H; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, People's Republic of China., He Q; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, People's Republic of China., Pan Y; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, People's Republic of China., Wu Y; Tsinghua-Foxconn Nanotechnology Research Center, Department of Physics, Tsinghua University, Beijing100084, People's Republic of China.; Department of Mechanical Engineering, Tsinghua University, Beijing100084, People's Republic of China., Zhang J; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, People's Republic of China.; Frontier Science Center for Quantum Information, Beijing100084, People's Republic of China., Wang Y; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing100084, People's Republic of China.; Frontier Science Center for Quantum Information, Beijing100084, People's Republic of China., Zhou X; Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai200433, People's Republic of China.; Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai200433, People's Republic of China.; Shanghai Qi Zhi Institute, Shanghai200232, People's Republic of China., Shen J; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, People's Republic of China.; Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai200433, People's Republic of China.; Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai200433, People's Republic of China.; Shanghai Qi Zhi Institute, Shanghai200232, People's Republic of China.; Collaborative Innovation Center of Advanced Microstructures, Nanjing210093, People's Republic of China.; Shanghai Research Center for Quantum Sciences, Shanghai201315, People's Republic of China., Wang Y; State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai200433, People's Republic of China.; Shanghai Research Center for Quantum Sciences, Shanghai201315, People's Republic of China.
Jazyk:	angličtina
Zdroj:	Nano letters [Nano Lett] 2022 Sep 28; Vol. 22 (18), pp. 7606-7614. Date of Electronic Publication: 2022 Sep 19.
DOI:	10.1021/acs.nanolett.2c02701
Abstrakt:	A boundary helical Luttinger liquid (HLL) with broken bulk time-reversal symmetry belongs to a unique topological class that may occur in antiferromagnets (AFM). Here, we search for signatures of HLL on the edge of a recently discovered topological AFM, MnBi 2 Te 4 even-layer. Using a scanning superconducting quantum interference device, we directly image helical edge current in the AFM ground state appearing at its charge neutral point. Such a helical edge state accompanies an insulating bulk which is topologically distinct from the ferromagnetic Chern insulator phase, as revealed in a magnetic field driven quantum phase transition. The edge conductance of the AFM order follows a power law as a function of temperature and source-drain bias which serves as strong evidence for HLL. Such HLL scaling is robust at finite fields below the quantum critical point. The observed HLL in a layered AFM semiconductor represents a highly tunable topological matter compatible with future spintronics and quantum computation.
Databáze:	MEDLINE
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