Chirality-driven mass enhancement in the kagome Hubbard model - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: We investigate the quasiparticle-mass enhancement in the Hubbard model on thefrustrated kagome lattice by using a cluster extension of the dynamicalmean-field theory. By analyzing the cluster density matrix, we find a hierarchyof energy scale among charge, spin, and chirality degrees of freedom. Largeamount of entropy associated with the chirality is released at a much lowertemperature than other energy scales for spin and charge fluctuations, leadingto a sharp peak in the specific heat and the single-particle spectrum. Theresults manifest a generic mechanism of mass enhancement driven by an emergentcomposite degree of freedom under geometrical frustration.



Author: Masafumi Udagawa, Yukitoshi Motome

Source: https://arxiv.org/







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