Collective Excitations in 2D Helimagnets
ORAL
Abstract
In helimagnets, it is possible to find concurrent ferroelectric orders due to an interplay between spin-orbit coupling and helimagnetism. In such cases, apart from phonons and magnons, the systems may also host other types of collective excitations such as ferrons and electromagnons. Here, we employ inelastic electron tunneling spectroscopy to study nickel dihalides, which are 2D helimagnets with ferroelectric orders. We found signatures of collective excitations at meV scale. Besides, our results suggest that these excitations respond differently to an in-plane and out-of-plane magnetic field, in contrast to the magnons in 2D collinear magnets chromium trihalides. Our study paves the way for further characterizations of collective excitations in 2D helimagnets.
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Presenters
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Hung-Yu Y Yang
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA, University of California, Los Angeles, Boston College
Authors
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Hung-Yu Y Yang
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA, University of California, Los Angeles, Boston College
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Gang Qiu
UCLA
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Abdullah Alrasheed
University of California, Los Angeles
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Fazel Tafti
Boston College, Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA, Department of Physics, Boston College, Chestnut Hill, Massachusetts, 02467, USA
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Kang-Lung Wang
University of California, Los Angeles