Two-parameter extended Hubbard Hamiltonian with supersymmetry |
| |
Authors: | A Montorsi |
| |
Institution: | (1) Department of Physics, University of Illinois at Urbana-Champaign, 61801, USA and Dipartimento di Fisica and Unitá INFM, Politecnico di Torino, 10129 Torino, Italia, IT |
| |
Abstract: | We investigate under which circumstances extended Hubbard models, including bond-charge, exchange, and pair-hopping terms,
are invariant under gl
(2,1) superalgebra. This happens for a two-parameter Hamiltonian which includes as particular cases the t
-
J, the EKS and the one-parameter BGLZ Hamiltonians, all integrable in one dimension. We show that the two parameter Hamiltonian
can be recasted as the sum of the BGLZ Hamiltonian plus the graded permutation operator of electronic states on neighbouring
sites. The integrability of the corresponding one-dimensional model is discussed.
Received: 17 February 1998 / Received in final form: 6 March 1998 / Accepted: 17 April 1998 |
| |
Keywords: | PACS 71 27 +a Strongly correlated electron systems heavy fermions - 75 10 Lp Band and itinerant models |
本文献已被 SpringerLink 等数据库收录! |
|