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We study a novel type of non-Fermi liquid where there exist an infinite number of critical bosonic modes instead of finite bosonic modes for the conventional ones. We consider itinerant magnets with both conduction electrons and fluctuating magnetic moments in three dimensions. With Dzyaloshinskii-Moriya interaction, the moments fluctuate near a boson surface in the reciprocal space at low energies when the system approaches an ordering transition. The infinite number of critical modes on the boson surface strongly scatter the infinite gapless electrons on the Fermi surface and convert the metallic sector into a non-Fermi liquid. We explain the novel physical properties of this non-Fermi liquid. On the ordered side, a conventional non-Fermi liquid emerges due to the scattering by the gapless Goldstone mode from the spontaneous breaking of the global rotational symmetry. We discuss the general structure of the phase diagram in the vicinity of the quantum phase transition and clarify various crossover behaviors.
Dr. Gang Chen is currently a Professor of Physics at The University of Hong Kong. He has a rather broad interest in hard condensed matter physics, particularly on quantum matters and strongly correlated systems. Due to his contribution to the field, he was award “2017 Daniel Tsui Fellowship” by the University of Hong Kong and the “2018 Qiushi outstanding junior scientist” by the Qiushi foundation of Hong Kong. Besides his works in physics, he has talents in advising and mentoring students. The students, under his supervision, are confident and active, and are gradually pushing the frontiers of modern condensed matter physics.
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