Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8203599 | Physics Letters A | 2018 | 4 Pages |
Abstract
A new variational technique for investigation of the ground state and correlation functions in 1D quantum magnets is proposed. A spin Hamiltonian is reduced to a fermionic representation by the Jordan-Wigner transformation. The ground state is described by a new non-local trial wave function, and the total energy is calculated in an analytic form as a function of two variational parameters. This approach is demonstrated with an example of the XXZ-chain of spin-1/2 under a staggered magnetic field. Generalizations and applications of the variational technique for low-dimensional magnetic systems are discussed.
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Authors
Yu.B. Kudasov, R.V. Kozabaranov,