Spin Berry phase in the Fermi-arc states
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An unusual electronic property of a Weyl semimetallic nanowire is revealed. Its band dispersion exhibits multiple subbands of partially flat dispersion, originating from the Fermi-arc states. Remarkably, the lowest energy flat subbands bear a finite size energy gap, implying that electrons in the Fermi-arc surface states are susceptible to the spin Berry phase. This is shown to be a consequence of spin-to-surface locking in the surface electronic states. We verify this behavior and the existence of the spin Berry phase in the low-energy effective theory of Fermi-arc surface states on a cylindrical nanowire by deriving the latter from a bulk Weyl Hamiltonian. We point out that in any surface state exhibiting a spin Berry phase π, a zero-energy bound state is formed along a magnetic flux tube of strength Φ0/2=hc/(2e). This effect is highlighted in a surfaceless bulk system pierced by a dislocation line, which shows a 1D chiral mode along the dislocation line.
収録刊行物
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- Physical Review B
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Physical Review B 84 (24), 245415-, 2011
American Physical Society
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詳細情報 詳細情報について
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- CRID
- 1050859215939043456
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- NII論文ID
- 120005198246
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- NII書誌ID
- AA11187113
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
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