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:
-
- Princeton Univ., NJ (United States). Dept. of Physics
- Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy
- Univ. Würzburg (Germany). Inst. für Theoretische Physik und Astrophysik
- 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}
}
Web of Science
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