scholarly journals Fermion-induced quantum critical point in Dirac semimetals: A sign-problem-free quantum Monte Carlo study

2020 ◽  
Vol 101 (8) ◽  
Author(s):  
Bo-Hai Li ◽  
Zi-Xiang Li ◽  
Hong Yao
Keyword(s):  
Monte Carlo ◽  
Critical Point ◽  
Quantum Monte Carlo ◽  
Quantum Critical Point ◽  
Monte Carlo Study ◽  
Sign Problem ◽  
Dirac Semimetals ◽  
Quantum Critical

scholarly journals Ising Nematic Quantum Critical Point in a Metal: A Monte Carlo Study

2016 ◽  
Vol 6 (3) ◽  
Author(s):  
Yoni Schattner ◽  
Samuel Lederer ◽  
Steven A. Kivelson ◽  
Erez Berg
Keyword(s):  
Monte Carlo ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Monte Carlo Study ◽  
Quantum Critical

QUANTUM MONTE CARLO STUDY ON RANDOM BOND MIXED-SPIN CHAIN

2007 ◽  
Vol 21 (23n24) ◽  
pp. 4196-4200
Author(s):  
HONGWEI FAN ◽  
ZHAOXIN XU ◽  
HEPING YING
Keyword(s):  
Monte Carlo ◽  
Critical Point ◽  
Quantum Monte Carlo ◽  
Spin Chain ◽  
Quantum Critical Point ◽  
Monte Carlo Study ◽  
Its Region ◽  
Pure System ◽  
Mixed Spin ◽  
System Quantum

The effects of bond randomness on the quantum mixed-spin chain 1-1-1/2-1/2 are investigated by a quantum Monte Carlo study. We find that around the critical point of original pure system, quantum Griffiths phases appears, and its region is enlarged with increasing of bond randomness. Moreover, the critical behavior of the original quantum critical point has been changed by the randomness.

scholarly journals Lattice quantum Monte Carlo study of chiral magnetic effect in Dirac semimetals

2018 ◽  
Vol 396 ◽  
pp. 78-86 ◽  
Author(s):  
D.L. Boyda ◽  
V.V. Braguta ◽  
M.I. Katsnelson ◽  
A.Yu. Kotov
Keyword(s):  
Monte Carlo ◽  
Quantum Monte Carlo ◽  
Monte Carlo Study ◽  
Magnetic Effect ◽  
Chiral Magnetic Effect ◽  
Lattice Quantum ◽  
Dirac Semimetals

scholarly journals Identification of non-Fermi liquid fermionic self-energy from quantum Monte Carlo data

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Xiao Yan Xu ◽  
Avraham Klein ◽  
Kai Sun ◽  
Andrey V. Chubukov ◽  
Zi Yang Meng
Keyword(s):  
Monte Carlo ◽  
Finite Temperature ◽  
Quantum Monte Carlo ◽  
Fermi Liquid ◽  
Quantum Critical Point ◽  
Critical Metals ◽  
Monte Carlo Data ◽  
Low Frequencies ◽  
Self Energy ◽  
Quantum Critical

Abstract Quantum Monte Carlo (QMC) simulations of correlated electron systems provide unbiased information about system behavior at a quantum critical point (QCP) and can verify or disprove the existing theories of non-Fermi liquid (NFL) behavior at a QCP. However, simulations are carried out at a finite temperature, where quantum critical features are masked by finite-temperature effects. Here, we present a theoretical framework within which it is possible to separate thermal and quantum effects and extract the information about NFL physics at T = 0. We demonstrate our method for a specific example of 2D fermions near an Ising ferromagnetic QCP. We show that one can extract from QMC data the zero-temperature form of fermionic self-energy Σ(ω) even though the leading contribution to the self-energy comes from thermal effects. We find that the frequency dependence of Σ(ω) agrees well with the analytic form obtained within the Eliashberg theory of dynamical quantum criticality, and obeys ω2/3 scaling at low frequencies. Our results open up an avenue for QMC studies of quantum critical metals.

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