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- Fermi National Accelerator LaboratoryUS158 papers
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6 papers · 2 filters
Fractional quantum Hall states at zero magnetic field
Titus Neupert, Luiz Santos, Claudio Chamon +1
We present a simple prescription to flatten isolated Bloch bands with non-zero Chern number. We first show that approximate flattening of bands with non-zero Chern number is possib…
Thermodynamics of a gas of deconfined bosonic spinons in two dimensions
Anders W. Sandvik, Valeri N. Kotov, Oleg P. Sushkov
We consider the quantum phase transition between a Neel antiferromagnet and a valence-bond solid (VBS) in a two-dimensional system of S=1/2 spins. Assuming that the excitations of…
Kondo Quantum Criticality of Magnetic Adatoms in Graphene
Bruno Uchoa, T. G. Rappoport, A. H. Castro Neto
We examine the exchange Hamiltonian for magnetic adatoms in graphene with localized inner shell states. On symmetry grounds, we predict the existence of a class of orbitals that le…
Definitions of entanglement entropy of spin systems in the valence-bond basis
Yu-Cheng Lin, Anders W. Sandvik
The valence-bond structure of spin-1/2 Heisenberg antiferromagnets is closely related to quantum entanglement. We investigate measures of entanglement entropy based on transition g…
Effects of edge disorder in nano-scale antiferromagnetic clusters
Wanzhou Zhang, Wenan Guo, Kaj H Hoglund +2
We study the distribution of local magnetic susceptibilities in the two-dimensional antiferromagnetic S=1/2 Heisenberg model on various random clusters, in order to determine wheth…
Symmetry breaking and criticality in tensor-product states
Chen Liu, Ling Wang, Anders W. Sandvik +2
We discuss variationally optimized matrix-product states for the transverse-field Ising chain, using D*D matrices with small D=2-10. For finite system size N there are energy minim…