Spin polaron in a magnetic field

Details Spin polaron in a magnetic field Spin polaron in a magnetic field

1997-07-25

arxiv.org/abs/cond-mat/9707264v2

published in Phys.Rev.B 57, 6413 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 8 figures, 1 table

Scientific paper

10.1103/PhysRevB.57.6413

The influence of the homogeneous magnetic field on a single mobile hole in a magnetic insulator, as represented by the two-dimensional t-J model, is investigated by considering the coupling of the field to the orbital current. The energy of the J=0 system is analysed via the high-temperature expansion and the small system diagonalization. The susceptibility is shown to be diamagnetic and diverging at low temperatures T. In contrast, in the antiferrmagnetic J>0 case small systems generically reveal a tendency towards a paramagnetic response in larger fields at low T. By employing at T=0 the cumulant expansion we study the ground state in arbitrary B, showing a behavior very sensitive to the character of the quasiparticle dispersion and the magnetic-field strength. At low B the perturbation and small-systems results are consistent with a pronounced diamagnetic susceptibility at T->0, but indicate on a suppressed contribution at intermediate T~J.

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