Thermodynamics and tunneling spectroscopy in the pseudogap regime of the boson–fermion model

Motivated by the STM experimental data on Bi 2Sr 2CaCu 2O 8+ x which indicate the tunneling conductance asymmetry σ(− V)≠ σ( V), we report that such a behavior can be explained in terms of the boson–fermion model. It has been shown in the recent studies, based on various selfconsistent techniques to capture the many-body effects, that the low energy spectrum of the boson–fermion model is featured by an appearance of the pseudogap at T ∗>T c . We argue that the pseudogap structure has to exhibit a particle–hole asymmetry. This asymmetry may eventually depend on the boson concentration.