Boston University

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

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Showing 2010 · cond-mat.str-elShow all

16 papers · 2 filters

cond-mat.str-el2010★ 1.1k cited

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…

cond-mat.str-el2010★ 1.2k cited

Electron-Electron Interactions in Graphene: Current Status and Perspectives

Valeri N. Kotov, Bruno Uchoa, Vitor M. Pereira +2

We review the problem of electron-electron interactions in graphene. Starting from the screening of long range interactions in these systems, we discuss the existence of an emergin…

cond-mat.str-el2010★ 28 cited

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…

cond-mat.str-el2010★ 70 cited

Properties of Resonating-Valence-Bond Spin Liquids and Critical Dimer Models

Ying Tang, Anders W. Sandvik, Christopher L. Henley

We use Monte Carlo simulations to study properties of Anderson's resonating-valence-bond (RVB) spin-liquid state on the square lattice (i.e., the equal superposition of all pairing…

cond-mat.str-el2010★ 37 cited

Example of a first-order Néel to Valence-Bond-Solid transition in two-dimensions

Arnab Sen, Anders W. Sandvik

We consider the $S = 1/2$ Heisenberg model with nearest-neighbor interaction $J$ and an additional multi-spin interaction $Q_{3}$ on the square lattice. The $Q_{3}$ term consists of thre…

cond-mat.str-el2010★ 46 cited

Fractional spin textures in the frustrated magnet SrCr $_{9 p}$ Ga $_{12 - 9 p}$ O $_{19}$

Arnab Sen, Kedar Damle, Roderich Moessner

We consider the archetypal frustrated antiferromagnet SrCr $_{9 p}$ Ga $_{12 - 9 p}$ O $_{19}$ in its well-known spin-liquid state, and demonstrate that a Cr $^{3 +}$ spin $S = 3/2$ ion in dire…

cond-mat.str-el2010★ 22 cited

Quantum phase transitions in disordered dimerized quantum spin models and the Harris criterion

Dao-Xin Yao, Jonas Gustafsson, E. W. Carlson +1

We use quantum Monte Carlo simulations to study effects of disorder on the quantum phase transition occurring versus the ratio g=J/J' in square-lattice dimerized S=1/2 Heisenberg a…

cond-mat.str-el2010★ 152 cited

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…

cond-mat.str-el2010★ 9 cited

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…

cond-mat.str-el2010★ 2 cited

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…

cond-mat.str-el2010★ 7 cited

Temperature-Dependent Anomalies in the Structure of the (001) Surface of LiCu2O2

Xuetao Zhu, Yangyang Yao, H. C. Hsu +2

Surface corrugation functions, derived from elastic helium atom scattering (HAS) diffraction patterns at different temperatures, reveal that the Cu2+ rows in the (001) surface of L…

cond-mat.str-el2010★ 159 cited

Isolated Flat Bands and Spin-1 Conical Bands in Two-Dimensional Lattices

Dmitry Green, Luiz Santos, Claudio Chamon

Dispersionless bands, such as Landau levels, serve as a good starting point for obtaining interesting correlated states when interactions are added. With this motivation in mind, w…

cond-mat.str-el2010★ 32 cited

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…

cond-mat.str-el2010★ 95 cited

Ground states of a frustrated quantum spin chain with long-range interactions

Anders W. Sandvik

The ground state of a spin-1/2 Heisenberg chain with both frustration and long-range interactions is studied using Lanczos exact diagonalization. The evolution of the well known di…

cond-mat.str-el2010★ 202 cited

Continuous quantum phase transition between an antiferromagnet and a valence-bond-solid in two dimensions; evidence for logarithmic corrections to scaling