Bose-Einstein condensate of Dirac magnons
ORAL
Abstract
A Dirac-like quasiparticle spectrum is generated for localized magnetic moments on a 2D honeycomb lattice. The bosonic nature of these excitations and pumping allow for an accumulation of Dirac bosons and open up the possibility of the Bose-Einstein condensation at the Dirac point.
We explore the formation and collective modes of the Bose-Einstein condensate of Dirac magnons (Dirac BEC). We derive a phenomenological multi-component model of pumped bosons together with bosons residing at Dirac nodes and study the dynamics of the condensates. The condensate coherence and its multi-component nature are manifested in the Rabi oscillations whose period is determined by a Haldane-like gap in the spin-wave spectrum. This gap also allows one to control the properties and stability of the collective modes.
A Dirac magnon BEC remains yet to be experimentally realized. We hope that our findings will stimulate the corresponding experimental search.
We explore the formation and collective modes of the Bose-Einstein condensate of Dirac magnons (Dirac BEC). We derive a phenomenological multi-component model of pumped bosons together with bosons residing at Dirac nodes and study the dynamics of the condensates. The condensate coherence and its multi-component nature are manifested in the Rabi oscillations whose period is determined by a Haldane-like gap in the spin-wave spectrum. This gap also allows one to control the properties and stability of the collective modes.
A Dirac magnon BEC remains yet to be experimentally realized. We hope that our findings will stimulate the corresponding experimental search.
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Presenters
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Pavlo Sukhachov
Department of Physics, Yale University, Yale University
Authors
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Pavlo Sukhachov
Department of Physics, Yale University, Yale University
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Saikat Banerjee
Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Univ Augsburg, University of Augsburg
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Alexander Balatsky
Physics, University of Connecticut, Department of Physics, University of Connecticut, Department of Physics, University of Connecticut (UCONN), University of Connecticut