A fermion phenomenology of low-temperature strongly-noncrystalline solids

Mihail Turlakov

doi:10.1016/j.jnoncrysol.2022.121632

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arXiv · 2111.03578

A fermion phenomenology of low-temperature strongly-noncrystalline solids

Mihail Turlakov

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Abstract

Insisting on the relevance of spin-statistics theorem, I propose that anomalous low-energy excitations of strongly-noncrystalline solids (SNSs), observed at low temperatures T < 1 K, are fermions, which are localized and weakly interacting. This phenomenological theory rationalizes all low-energy quantum many-body states of SNSs as Goldstone bosons-phonons and half-integer-spin fermions. Fermi glass, rather than isolated two-level systems (TLSs), appears to be a consistent theory of various thermal and nonlinear response properties of SNSs. A robust consequence of this theory is nearly constant-in-energy density of fermion states near Fermi energy, which in turn implies linear-in-temperature specific heat and frequency-independent sound internal friction. Consistent parameters of Landau-Fermi glass are calculated on theoretical grounds as well as from experimental data.

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Mihail Turlakov. 2021-11-05. A fermion phenomenology of low-temperature strongly-noncrystalline solids. https://doi.org/10.1016/j.jnoncrysol.2022.121632

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