Sen, Diptiman and Chitra, R (1995) Large-U limit of a Hubbard model in a magnetic field: Chiral spin interactions and paramagnetism. In: Physical Review B, 51 (3). pp. 1922-1925.
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We consider the large- U limit of the one-band Hubbard model at half-filling on a nonbipartite twodimensional lattice. An external magnetic field can induce a three-spin chiral interaction at order $1/U^2$. We discuss situations in which, at low temperatures, the chiral term may have a larger effect than the Pauli coupling of electron spins to a magnetic field. We present a model that explicitly demonstrates this. The ground state is a singlet with a gap; hence the spin susceptibility is zero while the chiral susceptibility is finite and paramagnetic.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to American Institute Of Physics.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Centre for Theoretical Studies
Division of Physical & Mathematical Sciences > Physics
|Date Deposited:||15 Sep 2006|
|Last Modified:||19 Sep 2010 04:31|
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