Effects of a magnetic field on the one-dimensional spin-orbital model
نویسندگان
چکیده
We study the effects of a uniform magnetic field on the one-dimensional spinorbital model in terms of effective field theories. Two regions are examined: one around the SU(4) point (J=K/4) and the other with K ≪ J [see Eq. (1)]. We found that when J ≤ K/4, the spin and orbital correlation functions exhibit power-law decay with non-universal exponents. In the region with J > K/4, the excitation spectrum has a gap. When the magnetic field is beyond some critical value, a quantum phase transition occurs. However, the correlation functions around the SU(4) point and the region with K ≪ J exhibit distinct behavior. This results from different structures of excitation spectra in both regime. Typeset using REVTEX 1
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تاریخ انتشار 2008