Condensed Matter Seminar

Friday, May 11th - h. 14:30

Aula Seminari (A-34)

C. Biagini (Univ. Firenze)

Zero-bias anomaly in high magnetic fields

Abstract

 A normal metal in a ultraquantum magnetic field is studied. It

is shown that the conventional three-dimensional (3D) Fermi liquid

adiabatically evolves in a one-dimensional (1D) interactng electron gas

(Luttinger Liquid). The crossover is studied both via bosonization and

with a perturbative treatment followed by a renormalization procedure.

This phase is characterized by the zero-bias anomaly in tunneling: the

tunneling conductance scales as a power-law of voltage or temperature.

The tunneling exponent increases with the magnetic field as $B\ln B$.

The zero-bias anomaly is most pronounced for tunneling along the

field direction and absent in the direction perpendicular to the field.