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Title: Fermion-induced quantum criticality with two length scales in Dirac systems

Journal Article · · Physical Review B
 [1];  [2];  [3];  [1]
  1. Univ. of Cologne (Germany)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Simon Fraser Univ., Burnaby, BC (Canada)

The quantum phase transition to a Z3-ordered Kekule valence bond solid in two-dimensional Dirac semimetals is governed by a fermion-induced quantum critical point, which renders the putatively discontinuous transition continuous. We study the resulting universal critical behavior in terms of a functional RG approach, which gives access to the scaling behavior on the symmetry-broken side of the phase transition, for general dimension and number of Dirac fermions. In particular, we investigate the emergence of the fermion-induced quantum critical point for space-time dimensions 2 < d < 4. We determine the integrated RG ow from the Dirac semi-metal to the symmetry-broken regime and analyze the underlying fixed point structure. We show that the fermion-induced criticality leads to a scaling form with two divergent length scales, due to the breaking of the discrete Z3 symmetry. This provides another source of scaling corrections, besides the one stemming from being in the proximity to the first order transition.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1466621
Alternate ID(s):
OSTI ID: 1427884
Report Number(s):
BNL-207976-2018-JAAM; PRBMDO
Journal Information:
Physical Review B, Vol. 97, Issue 12; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Critical exponents can be different on the two sides of a transition: A generic mechanism text January 2015
Competition of density waves and quantum multicritical behavior in Dirac materials from functional renormalization text January 2015
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Fermion-induced quantum critical points text January 2015
Quantum criticality with two length scales text January 2016
Ising and Gross-Neveu model in next-to-leading order text January 2016
Fermion-induced quantum critical points in three-dimensional Weyl semimetals text January 2016
Gross-Neveu-Yukawa model at three loops and Ising critical behavior of Dirac systems text January 2017
Bootstrapping 3D Fermions with Global Symmetries text January 2017
Critical (Chiral) Heisenberg Model with the Functional Renormalisation Group text January 2017
Antiferromagnetism and competing charge instabilities of electrons in strained graphene from Coulomb interactions text January 2017
Four-loop critical exponents for the Gross-Neveu-Yukawa models text January 2017
Exact evolution equation for the effective potential text January 2017
Quantum criticality beyond the Landau-Ginzburg-Wilson paradigm text January 2003
What can be learnt from the nonperturbative renormalization group? text January 2004
Electron fractionalization in two-dimensional graphenelike structures text January 2006
Ordered phase and scaling in $Z_n$ models and the three-state antiferromagnetic Potts model in three dimensions text January 1999
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Cited By (5)

Fermion-induced quantum critical point in Dirac semimetals: A sign-problem-free quantum Monte Carlo study journal February 2020
Fermionic multicriticality near Kekulé valence-bond ordering on a honeycomb lattice journal June 2019
Momentum dependence of quantum critical Dirac systems text January 2019
Momentum dependence of quantum critical Dirac systems journal June 2019
Critical behavior of Dirac fermions from perturbative renormalization text January 2018

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