Ian Affleck

Observation of<i>S</i>=1/2 degrees of freedom in an<i>S</i>=1 linear-chain Heisenberg antiferromagnet

THe ground state of the typical spin-1 linear-chain Heisenberg antiferromagnet Ni(${\mathrm{C}}_{2}$${\mathrm{H}}_{8}$${\mathrm{N}}_{2}$${)}_{2}$${\mathrm{NO}}_{2}$(${\mathrm{Cl...

Large-<i>n</i>limit of the Heisenberg-Hubbard model: Implications for high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors

The Heisenberg-Hubbard model is solved in the large-n limit to gain insight into its relevance to the coppper-oxide materials. A gapless disordered ground state is found for the...

Critical theory of overscreened Kondo fixed points

The Kondo effect, conformal field theory and fusion rules

Superconducting Abrikosov transition in the large-N limit

Quantum-Statistical Metastability

Consider a system rendered unstable by both quantum tunneling and thermodynamic fluctuation. The tunneling rate $\ensuremath{\Gamma}$, at temperature ${\ensuremath{\beta}}^{\ens...