Chiral Spin Mode on the Surface of a Topological Insulator

H. H. Kung, S. Maiti, X. Wang, S. W. Cheong, D. L. Maslov, G. Blumberg

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31 Citas (Scopus)

Resumen

Using polarization-resolved resonant Raman spectroscopy, we explore collective spin excitations of the chiral surface states in a three dimensional topological insulator, Bi2Se3. We observe a sharp peak at 150 meV in the pseudovector A2 symmetry channel of the Raman spectra. By comparing the data with calculations, we identify this peak as the transverse collective spin mode of surface Dirac fermions. This mode, unlike a Dirac plasmon or a surface plasmon in the charge sector of excitations, is analogous to a spin wave in a partially polarized Fermi liquid, with spin-orbit coupling playing the role of an effective magnetic field.

Idioma originalInglés
Número de artículo136802
PublicaciónPhysical Review Letters
Volumen119
N.º13
DOI
EstadoPublicada - sep. 27 2017
Publicado de forma externa

Nota bibliográfica

Publisher Copyright:
© 2017 American Physical Society.

!!!ASJC Scopus Subject Areas

  • Física y Astronomía General

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