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Title: Half-filled Landau levels: A continuum and sign-free regularization for three-dimensional quantum critical points

Abstract

In this paper, we explore a method for regulating 2+1D quantum critical points in which the ultraviolet cutoff is provided by the finite density of states of particles in a magnetic field rather than by a lattice. Such Landau-level quantization allows for numerical computations on arbitrary manifolds, like spheres, without introducing lattice defects. In particular, when half-filling a Landau level with $N = 4$ electron flavors, with appropriate interaction anisotropies in flavor space, we obtain a fully continuum regularization of the $$\mathrm{O}(5)$$ nonlinear sigma model with a topological term, which has been conjectured to flow to a deconfined quantum critical point. We demonstrate that this model can be solved by both infinite density-matrix renormalization group (DMRG) calculations and sign-free determinantal quantum Monte Carlo. DMRG calculations estimate the scaling dimension of the $$\mathrm{O}(5)$$ vector operator to be in the range $$\mathrm{Δ_V}$$ ~ $0.55-0.7$, depending on the stiffness of the nonlinear sigma model. Future Monte Carlo simulations will be required to determine whether this dependence is a finite-size effect or further evidence for a weak first-order transition.

Authors:
 [1];  [2];  [3];  [4]
  1. Princeton Univ., NJ (United States). Dept. of Physics
  2. Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy
  3. Univ. Würzburg (Germany). Inst. für Theoretische Physik und Astrophysik
  4. Princeton Univ., NJ (United States). Dept. of Physics; Univ. of California, Berkeley, CA (United States). Dept. of Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1572789
Alternate Identifier(s):
OSTI ID: 1484552
Grant/Contract Number:  
AC02-05CH11231; SC0002140; AC02-05-CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 23; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ippoliti, Matteo, Mong, Roger S. K., Assaad, Fakher F., and Zaletel, Michael P. Half-filled Landau levels: A continuum and sign-free regularization for three-dimensional quantum critical points. United States: N. p., 2018. Web. doi:10.1103/physrevb.98.235108.
Ippoliti, Matteo, Mong, Roger S. K., Assaad, Fakher F., & Zaletel, Michael P. Half-filled Landau levels: A continuum and sign-free regularization for three-dimensional quantum critical points. United States. https://doi.org/10.1103/physrevb.98.235108
Ippoliti, Matteo, Mong, Roger S. K., Assaad, Fakher F., and Zaletel, Michael P. Wed . "Half-filled Landau levels: A continuum and sign-free regularization for three-dimensional quantum critical points". United States. https://doi.org/10.1103/physrevb.98.235108. https://www.osti.gov/servlets/purl/1572789.
@article{osti_1572789,
title = {Half-filled Landau levels: A continuum and sign-free regularization for three-dimensional quantum critical points},
author = {Ippoliti, Matteo and Mong, Roger S. K. and Assaad, Fakher F. and Zaletel, Michael P.},
abstractNote = {In this paper, we explore a method for regulating 2+1D quantum critical points in which the ultraviolet cutoff is provided by the finite density of states of particles in a magnetic field rather than by a lattice. Such Landau-level quantization allows for numerical computations on arbitrary manifolds, like spheres, without introducing lattice defects. In particular, when half-filling a Landau level with $N = 4$ electron flavors, with appropriate interaction anisotropies in flavor space, we obtain a fully continuum regularization of the $\mathrm{O}(5)$ nonlinear sigma model with a topological term, which has been conjectured to flow to a deconfined quantum critical point. We demonstrate that this model can be solved by both infinite density-matrix renormalization group (DMRG) calculations and sign-free determinantal quantum Monte Carlo. DMRG calculations estimate the scaling dimension of the $\mathrm{O}(5)$ vector operator to be in the range $\mathrm{Δ_V}$ ~ $0.55-0.7$, depending on the stiffness of the nonlinear sigma model. Future Monte Carlo simulations will be required to determine whether this dependence is a finite-size effect or further evidence for a weak first-order transition.},
doi = {10.1103/physrevb.98.235108},
journal = {Physical Review B},
number = 23,
volume = 98,
place = {United States},
year = {Wed Dec 05 00:00:00 EST 2018},
month = {Wed Dec 05 00:00:00 EST 2018}
}

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Works referencing / citing this record:

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