Journal
PHYSICAL REVIEW B
Volume 105, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.195142
Keywords
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Funding
- National Natural Science Foundation of China [11904205, 12074217, 12174220]
- Shandong Provincial Natural Science Foundation of China [ZR2019QA019, ZR2019MEM013]
- Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) [2019JZZY010302]
- Qilu Young Scholar Program of Shandong University
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This study presents the emergence of doubled QSHE in two dimensions characterized by a high-spin Chern number of CS = 2, utilizing β-antimonene and β-bismuthene as potential material candidates with band inversions at generic k points.
The discovery of the quantum spin Hall effect (QSHE) has ignited the field of topological physics with a vast variety of exotic properties. Here we present the emergence of doubled QSHE in two dimensions characterized with a high-spin Chern number of CS = 2 and two pairs of helical edge states. Although overlooked and invisible in topological quantum chemistry and symmetry indicator theory, the already experimentally synthesized ??-antimonene and ??-bismuthene (??-Bi) are revealed as realistic material candidates of predicted topological states with band inversions emerging at generic k points, rather than the high-symmetry momenta. Remarkably, the nontrivial energy gap can be as large as 342 meV for ??-Bi, indicating the high possibility of room-temperature observation of the doubled QSHE. Moreover, a four-band effective model is constructed to demonstrate further the feasibility of attaining this type of nontrivial topology. Our results not only uncover a novel topological character of antimony and bismuth but also facilitate the experimental characterization of the previously overlooked hidden topology.
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