Rounding by disorder of first-order quantum phase transitions: Emergence of quantum critical points

Pallab Goswami*, David Schwab, Sudip Chakravarty

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We give a heuristic argument for disorder rounding of a first-order quantum phase transition into a continuous phase transition. From both weak and strong disorder analysis of the N-color quantum Ashkin-Teller model in one spatial dimension, we find that, for N/3, the first-order transition is rounded to a continuous transition and the physical picture is the same as the random transverse field Ising model for a limited parameter regime. The results are strikingly different from the corresponding classical problem in two dimensions where the fate of the renormalization group flows is a fixed point corresponding to N-decoupled pure Ising models.

Original languageEnglish (US)
Article number015703
JournalPhysical review letters
Volume100
Issue number1
DOIs
StatePublished - Jan 8 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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