Mott glass from localization and confinement
arXiv:1803.04426 · doi:10.1103/PhysRevB.97.184205
Abstract
We study a system of fermions in one spatial dimension with linearly confining interactions and short-range disorder. We focus on the zero temperature properties of this system, which we characterize using bosonization and the Gaussian variational method. We compute the static compressibility and ac conductivity, and thereby demonstrate that the system is incompressible, but exhibits gapless optical conductivity. This corresponds to a "Mott-glass" state, distinct from an Anderson and a fully gapped Mott insulator, arising due to the interplay of disorder and charge confinement. We argue that this "Mott-glass" phenomenology should persist to non-zero temperatures.
arXiv comment6+3 pages, 2 figures, published version
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- Is there a Mott-glass phase in a one-dimensional disordered quantum fluid with linearly confining interactions?
- Mott-glass phase induced by long-range correlated disorder in a one-dimensional Bose gas
- AC Conductivity Crossover in Localized Superconductors