Polarons in thet-J model
作者： A. Sherman , J. Sabczynski , M. Schreiber
DOI: 10.1007/BF01314006
关键词: Wave function 、 Phonon 、 Hubbard model 、 Effective mass (solid-state physics) 、 Condensed matter physics 、 Brillouin zone 、 Ground state 、 t-J model 、 Physics 、 Hamiltonian (quantum mechanics)
摘要: A convenient form of the Peierls-Hubbard Hamiltonian is obtained for case when Hubbard repulsion largest energy parameter. It allows to consider in spin-wave approximation properties one-hole low-lying excitations a 2d lattice. For parameters approximately corresponding La2CuO4 it shown that hole polarons CuO2 planes lightly doped samples are large size with solitonlike-shaped highly asymmetric wave function oriented along diagonals or small depending on value electron-phonon coupling. In both cases cooperative effect and electron-magnon interactions leads effective mass hopping transport excitations, preferential jumps former rotationally symmetric latter. hoping matrix elements which comparison phonon quantum competition between decrease total spin ground state increasing
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