Instability of the non-Fermi-liquid state of the Sachdev-Ye-Kitaev model

Zhen Bi, Chao Ming Jian, Yi Zhuang You, Kelly Ann Pawlak, Cenke Xu

Research output: Contribution to journalArticlepeer-review

Abstract

We study a series of perturbations on the Sachdev-Ye-Kitaev (SYK) model. We show that the maximal chaotic non-Fermi-liquid phase described by the ordinary q=4 SYK model has marginally relevant or irrelevant (depending on the sign of the coupling constants) four-fermion perturbations allowed by symmetry. Changing the sign of one of these four-fermion perturbations leads to a continuous chaotic-nonchaotic quantum phase transition of the system accompanied by a spontaneous time-reversal symmetry breaking. Starting with the SYKq model with a q-fermion interaction, similar perturbations can lead to a series of new fixed points with continuously varying exponents.

Original languageEnglish (US)
Article number205105
JournalPhysical Review B
Volume95
Issue number20
DOIs
StatePublished - May 4 2017

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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