Theory of Raman Scattering in One-Dimensional Quantum Antiferromagnets

Details Theory of Raman Scattering in One-Dimensional Quantum Antiferromagnets Theory of Raman Scattering in One-Dimensional Quantum Antiferromagnets

2011-05-11

arxiv.org/abs/1105.2259v1

Physics

Condensed Matter

Strongly Correlated Electrons

4+epsilon pages, 2 column version, 3 figures, 2 tables, Revtex

Scientific paper

We study theoretically the Raman scattering spectra in the one-dimensional quantum spin-1/2 antiferromagnets, a class of systems with strong quantum fluctuation and quantum liquid phases. With the Heisenberg interaction between the nearest-neighbor spins only, no magnetic Raman process exists. Additional interactions such as (i) magnetic anisotropy, (ii) bond dimerization, (iii) longer-range exchange interaction, (iv) tilting of the bond, and (v) staggered gyromagnetic tensor, lead to finite Raman scattering intensities with different behavior of spectra as a function of frequency, temperature, and magnetic field. Therefore, the Raman spectra offers a unique and important tool to study the microscopic Hamiltonian of one-dimensional quantum antiferromagnets.

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