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# Search results

30,959 records were found.

## First principles perspective on the microscopic model for Cs2CuCl4 and Cs2CuBr4

Comment: 4 pages; to appear in Journal of Physics: Conference Series (proceedings of HFM2008)

## Universal conductivity and dimensional crossover in multi-layer graphene

We show, by exact Renormalization Group methods, that in multi-layer graphene the dimensional crossover energy scale is decreased by the intra-layer interaction, and that for temperatures and frequencies greater than such scale the conductivity is close to the one of a stack of independent layers up to small corrections.

## Thermalization and dissipation in out of equilibrium quantum systems: A perturbative renormalization group approach

Comment: 17 pages, 12 figures

## Topological effects at short antiferromagnetic Heisenberg chains

Comment: 4 pages, 6 figures

## Real-space renormalization group study of the Hubbard model on a non-bipartite lattice

We present the real-space block renormalization group equations for fermion systems described by a Hubbard Hamiltonian on a triangular lattice with hexagonal blocks. The conditions that keep the equations from proliferation of the couplings are derived. Computational results are presented including the occurrence of a first-order metal-insulator transition at the critical value of $U/t \approx 12.5$.

## Spontaneous time reversal symmetry breaking in the pseudogap state of high-Tc superconductors

Comment: 11 pages, 4 figures

## Magnetoresistance in the SDW state of (TMTSF)2PF6 above T*~4K; Novel effect due to the Landau quantization

Comment: 7 pages, 10 figures, EPL latex

## Density dependent spin polarisation in ultra low-disorder quantum wires

Comment: 5 Pages 4 Figures email:djr@jupiter.phys.unsw.edu.au

## Green's function approach to the magnetic properties of the kagome antiferromagnet

The $S=1/2$ Heisenberg antiferromagnet is studied on the kagom\'e lattice by using a Green's function method based on an appropriate decoupling of the equations of motion. Thermodynamic properties as well as spin-spin correlation functions are obtained and characterize this system as a two-dimensional quantum spin liquid. Spin-spin correlation functions decay exponentially with distance down to low temperature and the calculated missing entropy at T=0 is found to be $0.46\ln{2}$. Within the present scheme, the specific heat exhibits a single peak structure and a $T^2$ dependence at low temperature.

## Low energy electronic states and triplet pairing in layered cobaltates

Comment: 4 pages, 3 figures