Quantum Monte Carlo Simulations of Bosonic and Fermionic Impurities in a TwoDimensional HardCore Boson System
Abstract
A twodimensional lattice hardcore 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 KosterlitzThouless 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:

 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 00319007
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOSONS; COMPUTERIZED SIMULATION; FERMIONS; IMPURITIES; INTERACTIONS; MONTE CARLO METHOD; TWODIMENSIONAL CALCULATIONS
Citation Formats
Sandvik, Anders W. Quantum Monte Carlo Simulations of Bosonic and Fermionic Impurities in a TwoDimensional HardCore 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 TwoDimensional HardCore 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 TwoDimensional HardCore 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 TwoDimensional HardCore Boson System},
author = {Sandvik, Anders W},
abstractNote = {A twodimensional lattice hardcore 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 KosterlitzThouless 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 = {00319007},
number = 12,
volume = 101,
place = {United States},
year = {2008},
month = {9}
}
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