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11 results on '"Auerbach, Assa"'

2. The Large N Expansion

Author

Auerbach, Assa, Birman, Joseph L., editor, Lynn, Jeffrey W., editor, Silverman, Mark P., editor, Stanley, H. Eugene, editor, Voloshin, Mikhail, editor, and Auerbach, Assa

Published
1994
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3. The Nonlinear Sigma Model: Large N

Author

Auerbach, Assa, Birman, Joseph L., editor, Lynn, Jeffrey W., editor, Silverman, Mark P., editor, Stanley, H. Eugene, editor, Voloshin, Mikhail, editor, and Auerbach, Assa

Published
1994
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4. From Ground States to Excitations

Author

Auerbach, Assa, Birman, Joseph L., editor, Lynn, Jeffrey W., editor, Silverman, Mark P., editor, Stanley, H. Eugene, editor, Voloshin, Mikhail, editor, and Auerbach, Assa

Published
1994
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5. Spin Representations

Author

Auerbach, Assa, Birman, Joseph L., editor, Lynn, Jeffrey W., editor, Silverman, Mark P., editor, Stanley, H. Eugene, editor, Voloshin, Mikhail, editor, and Auerbach, Assa

Published
1994
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7. Disorder in Low Dimensions

Author

Auerbach, Assa, Birman, Joseph L., editor, Lynn, Jeffrey W., editor, Silverman, Mark P., editor, Stanley, H. Eugene, editor, Voloshin, Mikhail, editor, and Auerbach, Assa

Published
1994
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8. Quantum Magnetism Approaches to Strongly Correlated Electrons

Author

Auerbach, Assa, Berruto, Federico, Capriotti, Luca, Cardona, Manuel, editor, Fulde, Peter, editor, von Klitzing, Klaus, editor, Merlin, Roberto, editor, Queisser, Hans-Joachim, editor, Störmer, Horst, editor, Morandi, Giuseppe, editor, Sodano, Pasquale, editor, Tagliacozzo, Arturo, editor, and Tognetti, Valerio, editor

Published
2000
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10. p6 chiral resonating valence bonds in the kagome antiferromagnet.

Author

Capponi, Sylvain, Chandra, V. Ravi, Auerbach, Assa, and Weinstein, Marvin

Subjects
*VALENCE bonds, *ANTIFERROMAGNETIC materials, *HEISENBERG model, *SUPERLATTICES, *CHIRALITY
Abstract

The kagome Heisenberg antiferromagnet is mapped onto an effective Hamiltonian on the star superlattice by contractor renormalization. A comparison of ground-state energies on large lattices to density matrix renormalization group justifies truncation of effective interactions at range 3 (36 sites). Within our accuracy, magnetic and translational symmetries are not broken (i.e., a spin liquid ground state). However, we discover doublet spectral degeneracies which signal the onset of p6 chirality symmetry breaking. This is understood by a simple mean field analysis. Experimentally, the p6 chiral order parameter should split the optical phonon degeneracy near the zone center. The addition of weak next to nearest neighbor coupling is discussed. [ABSTRACT FROM AUTHOR]

Published
2013
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11. Spin transport of weakly disordered Heisenberg chain at infinite temperature.

Author

Khait, Ilia, Gazit, Snir, Yao, Norman Y., and Auerbach, Assa

Subjects
*HEISENBERG model, *SCALING laws (Nuclear physics), *CONTINUED fractions
Abstract

We study the disordered Heisenberg spin chain, which exhibits many-body localization at strong disorder, in the weak to moderate disorder regime. A continued fraction calculation of dynamical correlations is devised, using a variational extrapolation of recurrents. Good convergence for the infinite chain limit is shown. We find that the local spin correlations decay at long times as C~t-β, whereas the conductivity exhibits a low-frequency power law σ~ωα. The exponents depict subdiffusive behavior β<1/2,α>0 at all finite disorders and convergence to the scaling result α+2β=1 at large disorders. [ABSTRACT FROM AUTHOR]

Published
2016
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