Transverse Pseudospin Susceptibility and Tunneling Parameters of Double Layer Electron Gas Systems

TL;DR

This paper investigates how interactions affect the tunneling parameters and pseudospin susceptibility in double-layer electron gas systems, highlighting the impact on measurable magnetic oscillation frequencies.

Contribution

It introduces the influence of electron interactions on tunneling and pseudospin susceptibility, extending understanding beyond non-interacting models.

Findings

Interactions modify the beating frequency in magnetic oscillations.

The effect is similar to exchange-correlation enhanced spin-splitting.

Tunneling amplitude t is crucial for modeling double-layer systems.

Abstract

The subbands of weakly coupled double-layer two dimensional electron gas systems consist of narrowly spaced pairs whose corresponding wavefunctions are symmetric and antisymmetric combinations of isolated layer subband wavefunctions. The energetic spacing within a pair is 2t where t is the interlayer tunneling amplitude. t is an important parameter in modeling these systems and, if interactions could be neglected, it would be proportional to beating frequencies seen in weak-field magnetic oscillations experiments and therefore readily measurable. We point out that interactions alter the beating frequency. We discuss similarities and differences between this effect and exchange-correlation enhanced spin-splitting.