Fermi Surface Reconstruction without Symmetry Breaking

Snir Gazit, Fakher F. Assaad, Subir Sachdev

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We present a sign-problem-free quantum Monte Carlo study of a model that exhibits quantum phase transitions without symmetry breaking and associated changes in the size of the Fermi surface. The model is an Ising gauge theory on the square lattice coupled to an Ising matter field and spinful "orthogonal"fermions at half filling, both carrying Ising gauge charges. In contrast to previous studies, our model hosts an electronlike, gauge-neutral fermion excitation providing access to Fermi-liquid phases. One of the phases of the model is a previously studied orthogonal semimetal, which has Z2 topological order and Luttinger-volume-violating Fermi points with gapless orthogonal fermion excitations. We elucidate the global phase diagram of the model: Along with a conventional Fermi-liquid phase with a large Luttinger-volume Fermi surface, we also find a "deconfined"Fermi liquid in which the large Fermi surface coexists with fractionalized excitations. We present results for the electron spectral function, showing its evolution from the orthogonal semimetal with a spectral weight near momenta {±p/2,±p/2} to a large Fermi surface.

Original languageAmerican English
Article number041057
JournalPhysical Review X
Volume10
Issue number4
DOIs
StatePublished - 21 Dec 2020

Bibliographical note

Publisher Copyright:
© 2020 authors. Published by the American Physical Society.

Fingerprint

Dive into the research topics of 'Fermi Surface Reconstruction without Symmetry Breaking'. Together they form a unique fingerprint.

Cite this