arXiv subjects

Peter Prelovsek

Publications and source records attributed to Peter Prelovsek.

21 records · Page 2Linked to original sources

arXiv2000

Pseudo gap in the density of states in cuprates

In the framework of the t-J model for cuprates we analyze the development of a pseudo gap in the density of states (DOS), which at low doping starts to emerge for temperatures T<J and persists up to the optimum doping. The analysis is based on numerical results for spectral functions obtained with the finite-temperature Lanczos method for finite two-dimensional clusters. We find that the pseudo gap scales with J and is robust also in the presence of nearest neighbor repulsive interaction. Numerical results are additionally compared with the self consistent Born approximation (SCBA) results for hole-like (photoemission) and electron-like (inverse photoemission) spectra at T=0. The analysis is suggesting that the origin of the pseudo gap is in short-range antiferromagnetic (AFM) spin correlations and strong asymmetry between the hole and electron spectra in the underdoped regime.

cond-mat.str-el↗

arXiv1996

Electron Green's Function in the Planar t-J Model

The electron Green's functions $G({\bf k},ω)$ within the t-J model and in the regime of intermediate doping is studied analytically using equations of motion for projected fermionic operators and the decoupling of the self energy into the single-particle and spin fluctuations. It is shown that the assumption of marginal spin dynamics at T=0 leads to an anomalous quasiparticle damping. Numerical result show also a pronounced asymmetry between the hole ($ω<0$) and the electron ($ω>0$) part of the spectral function, whereby hole-like quasiparticles are generally overdamped.

cond-mat.str-el↗

arXiv1996

Hall effect of charge carriers in a correlated system

The dynamical Hall response in a correlated electronic system is analysed within the linear response theory for tight binding models. At $T=0$ the d.c. Hall constant for a single quasiparticle is expressed explicitly via the charge stiffness, and a semiclassical result is recovered. As expected a hole-like response is found for the mobile hole introduced into a quantum antiferromagnet, as represented by the $t-J$ model.

cond-mat↗