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Möbius Insulator and Higher-Order Topology in MnBi_{2n}Te_{3n+1}
Rui-Xing Zhang1, Fengcheng Wu1, S Das Sarma1
1Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.
We introduce MnBi_{2n}Te_{3n+1} as a novel platform for higher-order topology. This material hosts unique Möbius fermions and chiral hinge modes, controllable via magnetic fields, enabling a topological magnetic switch.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Topology
Background:
- Higher-order topological insulators exhibit unique boundary states.
- MnBi2nTe3n+1 materials are promising candidates for topological phenomena.
- Symmetry protection is crucial for topological phase stability.
Purpose of the Study:
- To explore MnBi_{2n}Te_{3n+1} as a platform for higher-order topology.
- To investigate magnetic field control over topological states.
- To identify novel topological phases and their properties.
Main Methods:
- Theoretical modeling of electronic band structures.
- Symmetry analysis of topological phases.
- Investigation of magnetic field effects on topological states.
Main Results:
- MnBi_{2n}Te_{3n+1} hosts symmetry-protected higher-order topological phases.
- A canted antiferromagnetic phase exhibits Möbius fermions and chiral hinge modes.
- Magnetic field tuning induces transitions between distinct topological phases, acting as a topological magnetic switch.
Conclusions:
- MnBi_{2n}Te_{3n+1} is a versatile platform for higher-order topological physics.
- The material offers a route to realizing higher-order topological Möbius insulators.
- Tunable topological states via magnetic fields open avenues for novel electronic devices.
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