Pseudo-gap and spin polarization in a two-dimensional electron gas

Abstract

Tunnelling density of states in the vicinity of Fermi level of a two-dimensional electron gas subjected to an external parallel and zeroth magnetic field is calculated. It reveals a pseudo-gap recently observed in the experiments. The gap originates in spin polarization of 2DEG. Non-monotonic dependence of energy on a Landau level filling factor (density) was obtained. It implies the tunneling current peculiarities at filling factors 1/2 and 1. The Ising-like model of the exchange interaction in 2DEG was exploited instead of the conventional one. It was crucial to achieve even a qualitative agreement with experimental data.

6 pages, 3 figure; corrected typos, improved figures

References in corpus (4)

• The effect of a parallel magnetic field on the Boltzmann conductivity and the Hall coefficient of a disordered two dimensional Fermi liquid
• Tunneling measurements of the coulomb pseudogap in a two-dimensional electron system in a quantizing magnetic field
• Tunneling into Ferromagnetic Quantum Hall States: Observation of a Spin Bottleneck
• Spontaneous Magnetisation in a Quantum Wire