Asymmetric Tunneling Conductance in Doped Antiferromagnets
A. Maciąg and P. Wróbel
Institute for Low Temperature and Structure Research, P.O. Box 1410, 50-950 Wrocław 2, Poland
Full Text PDF
Received: 25 09 2005;
We calculate the tunneling conductance in the framework of the spin polaron model, which is an effective model for the t-J model, in the limit where at least short-range antiferromagnetic correlations exist. We show that both in the normal state and in the superconducting state the asymmetry of tunneling conductance is present. This fact is the implication of the particle-hole asymmetry of the spin polaron Hamiltonian in the limit of low density of spin polarons which are quasiparticles emerging in a hole doped antiferromagnet. Experimental evidence of analogous asymmetric tunneling conductance was found in the tunneling spectroscopy measurements of high T_c superconductors.
DOI: 10.12693/APhysPolA.109.607
PACS numbers: 71.10.Fd, 74.20.Mn, 74.25.Fy