Biomedical subjects

A G Yashenkin

Publications and source records attributed to A G Yashenkin.

2 recordsLinked to original sources

PubMed2001

Nesting symmetries and diffusion in disordered d-wave superconductors.

The low-energy density of states (DOS) of disordered 2D d-wave superconductors is extremely sensitive to details of both the disorder model and the electronic band structure. Using diagrammatic methods and numerical solutions of the Bogoliubov--de Gennes equations, we show that the physical origin of this sensitivity is the existence of a novel diffusive mode with momentum close to (pi,pi) which is gapless only in systems with a global nesting symmetry. We find that in generic situations the DOS vanishes at the Fermi level. However, proximity to the highly symmetric case may nevertheless lead to observable nonmonotonic behavior of the DOS in the cuprates.

Journal Article↗

PubMed2001

Interacting random Dirac fermions in superconducting cuprates.

We study the effects of quasiparticle interactions on disorder-induced localization of Dirac-like nodal excitations in superconducting high- Tc cuprates. As suggested by the experimental angle-resolved photoemission spectroscopy and terahertz conductivity data in Bi2Sr2CaCu2O(8+delta), we focus on the interactions mediated by the order parameter fluctuations near an incipient second pairing transition d --> d + is(id'). We find interaction corrections to the density of states, specific heat, and conductivity as well as phase and energy relaxation rates and assess the applicability of the recent localization scenarios for noninteracting random Dirac fermions to the cuprates.

Journal Article↗