Magnetoplasmon spectrum of two-dimensional helical metals

Details Magnetoplasmon spectrum of two-dimensional helical metals Magnetoplasmon spectrum of two-dimensional helical metals

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012njph...14a3047l&link_type=abstract

New Journal of Physics, Volume 14, Issue 1, pp. 013047 (2012).

Physics

Scientific paper

We investigate theoretically the magnetoplasmon spectrum of two-dimensional helical metals. The effects of the Zeeman energy and Coulomb interaction on the collective excitation modes are examined through the charge-density excitation (CDE) and spin-density excitation (SDE) intensities. At low excitation frequencies, the CDE is always accompanied by an SDE and is almost unaffected by the change in the Zeeman energy or Coulomb interaction intensity. However, at some higher excitation frequencies, the CDE and SDE can be decoupled and a strong SDE with a weak CDE can be realized by tuning either the Zeeman energy or the Coulomb interaction intensity.

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