Spin and valley waves in Dirac semimetals with population imbalance

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Research units

  • Russian Acad Sci, Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg Scientific Centre of the Russian Academy of Sciences, Ioffe Phys Tech Inst


We find an intervalley wave collective mode in two- and three-dimensional Dirac semimetals in the presence of a valley population imbalance. The dispersion relation of this mode is gapless, proportional to the square of the wave vector at small frequencies, and inversely proportional to the electron-electron exchange interaction energy. The valley wave serves as an energy gain source for the external field, that generates the intervalley transitions. The spin-wave analog is discussed for the case of a semimetal with nonequilibrium spin orientation.


Original languageEnglish
Article number121402
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B
Issue number12
Publication statusPublished - 9 Sep 2019
MoE publication typeA1 Journal article-refereed

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