Browsing by Author "Hallberg, Karen"
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Gottlieb, David; Lagos, Miguel; Hallberg, Karen; Balseiro, Carlos (1991)We introduce an approximate analytic solution for the S=1/2 one-dimensional antiferromagnetic Heisenberg model with coupling between nearest- and next-nearest-neighbor spins. Closed-form expressions for the ground state, ...
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Gottlieb, David; Montenegro, Maximiliano; Lagos, Miguel; Hallberg, Karen (1992)We present a variational approach to the Heisenberg antiferromagnetic model for spin 1/2 and anisotropic exchange, with an external longitudinal and transverse magnetic field. In the one-dimensional case, we calculate ...