Topological Phase Transition in Quasi-One-Dimensional Bismuth Iodide Bi4I4
arXiv:2407.19375 · doi:10.1038/s41535-024-00711-w
Abstract
The exploration of topological quantum materials and topological phase transitions is at the forefront of modern condensed matter physics. Quasi-one-dimensional (quasi-1D) bismuth iodide Bi4I4 exhibits versatile topological phases of matter including weak topological insulator (WTI) and higher-order topological insulator (HOTI) phases with high tunability in response to external parameters. In this work, performing laser-based angle-resolved photoemission spectroscopy with submicron spatial resolution (micro-ARPES), we comprehensively investigate the fine electronic structure and topological phase transition of Bi4I4. Our examination of the low-temperature α-phase reveals the presence of an energy gap on the (100) surface, providing spectroscopic evidence for the HOTI phase. Conversely, the high-temperature β-Bi4I4 harbors a gapless Dirac fermion on the (100) surface alongside gapped states on the (001) surface, thereby establishing a WTI phase. By tracking the temperature evolution of the (100) surface states, we unveil a thermal hysteresis of the surface gap in line with the α-β structural phase transition. Our findings elucidate the topological properties of Bi4I4 and directly evidence a temperature-induced topological phase transition from WTI to HOTI, which paves the way to potential applications based on the room-temperature topological phase transition in the quasi-1D topological quantum material.
References in corpus (15)
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Topological Insulators with Inversion Symmetry
- A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
- Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
- Weyl, Dirac and high-fold chiral fermions in topological quantum materials
- Topological Materials Discovery from Crystal Symmetry
- Large-Gap Quantum Spin Hall Insulator in single layer bismuth monobromide BiBr
- Room-temperature quantum spin Hall edge state in a higher-order topological insulator BiBr
- Quadrupole topological insulators in Ta2M3Te5 (M= Ni, Pd) monolayers
- Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4
- Epitaxial Growth of Quasi-One-Dimensional Bismuth-Halide Chains with Topological Non-Trivial Edge States
- Towards Layer-Selective Quantum Spin Hall Channels in Weak Topological Insulator Bi4Br2I2
- Facet Dependent Topological Phase Transition in Bi4Br4
- Development of a Laser-based angle-resolved-photoemission spectrometer with sub-micrometer spatial resolution and high-efficiency spin detection