期刊
NANOSCALE RESEARCH LETTERS
卷 7, 期 -, 页码 1-10出版社
SPRINGER
DOI: 10.1186/1556-276X-7-163
关键词
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资金
- Russian Foundation for Basic Research [11-02-12209-ofi-m, 10-02-92607-KO_ a]
- Russian Federation [MK-5288.2011.2]
- Dynasty Foundation
We study collective excitations in a helical electron liquid on a surface of three-dimensional topological insulator. Electron in helical liquid obeys Dirac-like equation for massless particles and direction of its spin is strictly determined by its momentum. Due to this spin-momentum locking, collective excitations in the system manifest themselves as coupled charge- and spin-density waves. We develop quantum field-theoretical description of spin-plasmons in helical liquid and study their properties and internal structure. Value of spin polarization arising in the system with excited spin-plasmons is calculated. We also consider the scattering of spin-plasmons on magnetic and nonmagnetic impurities and external potentials, and show that the scattering occurs mainly into two side lobes. Analogies with Dirac electron gas in graphene are discussed. PACS: 73.20.Mf; 73.22.Lp; 75.25.Dk.
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