Browsing by Author "Gottlieb, David"
Now showing items 1-6 of 6
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(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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(1993)The exact solution of the Hubbard-Peierls model is given in a cluster of six atoms and three spinless electrons. Phonons with wave vector k=π are retained and quantum mechanically analyzed. Energy level and several averages ...
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(1999)We analyze a one-dimensional spin system with two Dzialoshinsky-Moriya-like interactions which couple spins in pairs and triads, respectively. In spite of its intricate aspect, we obtain a very simple solution by means of ...
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(1993)We examine the nature of the singlet excitations introduced recently to describe the spin dynamics of the antiferromagnetic Heisenberg model with anisotropic coupling. It is shown that they excite spin waves polarized ...
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(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 ...
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(Universidad de Chile, 1991)
