Volume 87, Number 6, September 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||06 October 2009|
Quantum non-magnetic state near metal-insulator transition —A possible candidate of spin liquid state
Department of Physics, Beijing Normal University - Beijing 100875, China
Corresponding author: email@example.com
Accepted: 8 September 2009
In this paper, based on the formulation of an non-linear model, we study the two-dimensional -flux Hubbard model at half-filling. A quantum non-magnetic insulator is explored near the metal-insulator transition that may be a possible candidate of the spin liquid state. Such quantum non-magnetic insulator on square lattice is not induced by frustrations. Instead, it originates from quantum spin fluctuations with relatively small effective spin moments. In the strong-coupling limit, our results of the spin velocity and spin order parameter agree with results obtained from earlier calculations.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 75.10.-b – General theory and models of magnetic ordering
© EPLA, 2009
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