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Title: Quantum Monte Carlo Simulations of Bosonic and Fermionic Impurities in a Two-Dimensional Hard-Core Boson System

Abstract

A two-dimensional lattice hard-core boson system with a small fraction of bosonic or fermionic impurities is studied. The impurity hopping and interactions are identical to those of the dominant bosons, so that effects due to quantum statistics can be isolated. A quantum Monte Carlo scheme is developed in which bosonic paths are sampled and the impurities are introduced at the level of summing over permutation cycles. For both types of impurities, an anomaly in the effective impurity interaction energy is found at the Kosterlitz-Thouless temperature; it changes from attractive for T>T{sub KT} to repulsive for T<T{sub KT}, suggesting that impurities strongly affect the vortex physics.

Authors:
 [1]
  1. Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215 (United States)
Publication Date:
OSTI Identifier:
21179718
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 101; Journal Issue: 12; Other Information: DOI: 10.1103/PhysRevLett.101.120405; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOSONS; COMPUTERIZED SIMULATION; FERMIONS; IMPURITIES; INTERACTIONS; MONTE CARLO METHOD; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Sandvik, Anders W. Quantum Monte Carlo Simulations of Bosonic and Fermionic Impurities in a Two-Dimensional Hard-Core Boson System. United States: N. p., 2008. Web. doi:10.1103/PHYSREVLETT.101.120405.
Sandvik, Anders W. Quantum Monte Carlo Simulations of Bosonic and Fermionic Impurities in a Two-Dimensional Hard-Core Boson System. United States. doi:10.1103/PHYSREVLETT.101.120405.
Sandvik, Anders W. Fri . "Quantum Monte Carlo Simulations of Bosonic and Fermionic Impurities in a Two-Dimensional Hard-Core Boson System". United States. doi:10.1103/PHYSREVLETT.101.120405.
@article{osti_21179718,
title = {Quantum Monte Carlo Simulations of Bosonic and Fermionic Impurities in a Two-Dimensional Hard-Core Boson System},
author = {Sandvik, Anders W},
abstractNote = {A two-dimensional lattice hard-core boson system with a small fraction of bosonic or fermionic impurities is studied. The impurity hopping and interactions are identical to those of the dominant bosons, so that effects due to quantum statistics can be isolated. A quantum Monte Carlo scheme is developed in which bosonic paths are sampled and the impurities are introduced at the level of summing over permutation cycles. For both types of impurities, an anomaly in the effective impurity interaction energy is found at the Kosterlitz-Thouless temperature; it changes from attractive for T>T{sub KT} to repulsive for T<T{sub KT}, suggesting that impurities strongly affect the vortex physics.},
doi = {10.1103/PHYSREVLETT.101.120405},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 12,
volume = 101,
place = {United States},
year = {2008},
month = {9}
}