Half-filled periodic Anderson model and a model with the resonating-valence-bond ground state

Zsolt Gulácsi

Kensuke Kimura, Yasuhiro Hatsugai, Mahito Kohmoto

A one-parameter family of models interpolates between the periodic Anderson model with infinite repulsion at half-filling and a model whose ground state is exactly the resonating-valence-bond state. It is shown numerically that the excitation gap does not collapse. Therefore the ground states of the two models are adiabatically connected.

M. Gulácsi, Ian P. McCulloch

A one-parameter family of models that interpolates between the periodic A nderson model with infinite repulsion at half-filling and a model whose ground state is exactly the Resonating-Valence-Bond state is studied. It is shown numerically that the excitation gap does not collapse. Therefore the ground states of the two models are adiabatically connected. 1 I.

J. Callaway

The resonant valence-bond state, proposed by Anderson as a possible ground state in certain antiferromagnetic systems, and relevant to the problem of high-temperature superconductivity, is studied by numerical simulation on a finite cluster. It is found to be the ground state of a simple Hubbard model with a half-filled band on a centered hexagon for a range of intermediate values of the electron interaction parameter. A singlet ground state is obtained away from the half-filled limit for the same parameters.

Sushil Lamba, S. K. Joshi