期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.116401
关键词
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资金
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC020-76SF00515]
- Stanford Institute for Theoretical Physics (SITP)
- KITP's NSF [PHY05-51164]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0904264] Funding Source: National Science Foundation
We study low energy collective modes and transport properties of the helical metal on the surface of a topological insulator. At low energies, electrical transport and spin dynamics at the surface are exactly related by an operator identity equating the electric current to the in-plane components of the spin degrees of freedom. From this relation it follows that an undamped spin wave always accompanies the sound mode in the helical metal-thus it is possible to hear the sound of spins. In the presence of long range Coulomb interactions, the surface plasmon mode is also coupled to the spin wave, giving rise to a hybridized spin-plasmon mode. We make quantitative predictions for the spin-plasmon in Bi(2)Se(3), and discuss its detection in a spin-grating experiment.
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