Itinerant quantum critical point with frustration and a non-Fermi liquid
Name
PhysRevB.98.045116.pdf
Size
1.6 MB
Format
Adobe PDF
Checksum (MD5)
68731300784a44c64d879e88e5582b8b
Author(s)
Liu, Zi Hong
Xu, Xiao Yan
Qi, Yang
Sun, Kai
Meng, Zi Yang
Date Issued
July 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Liu, Zi Hong et al. "Itinerant quantum critical point with frustration and a non-Fermi liquid." Physical Review B 98, 4 (July 2018): 045116 © 2018 American Physical Society
Version
Final published version
Abstract
Employing the self-learning quantum Monte Carlo algorithm, we investigate the frustrated transverse-field triangle-lattice Ising model coupled to a Fermi surface. Without fermions, the spin degrees of freedom undergo a second-order quantum phase transition between paramagnetic and clock-ordered phases. This quantum critical point (QCP) has an emergent U(1) symmetry and thus belongs to the (2+1)D XY universality class. In the presence of fermions, spin fluctuations introduce effective interactions among fermions and distort the bare Fermi surface towards an interacting one with hot spots and Fermi pockets. Near the QCP, non-Fermi-liquid behaviors are observed at the hot spots, and the QCP is rendered into a different universality with Hertz-Millis–type exponents. The detailed properties of this QCP and possibly related experimental systems are also discussed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.98.045116
