Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom

TL;DR

This study investigates how the spin susceptibility in a two-dimensional electron system varies with valley occupancy, revealing that a two-valley system exhibits a smaller effective g* m* than a single-valley system, challenging previous assumptions.

Contribution

It provides the first direct measurement of spin susceptibility dependence on valley degeneracy in a 2D electron system, showing that valley population affects electron interaction strength.

Findings

Spin susceptibility g* m* is smaller when both valleys are equally populated.

Counterintuitive dependence of electron interactions on valley degeneracy.

Challenges the assumption that multi-valley systems are effectively more dilute.

Abstract

We report measurements of the spin susceptibility, $\chi\propto g_v g^*m^*$, in an AlAs two-dimensional electron system where, via the application of in-plane stress, we transfer electrons from one conduction-band valley to another ($g_v$ is the valley degeneracy, and $m^*$ and $g^*$ are the electron effective mass and g-factor). At a given density, when the two valleys are equally populated ($g_v=2$), the measured $g^*m^*$ is smaller than when only one valley is occupied ($g_v=1$). This observation counters the common assumption that a two-valley two-dimensional system is effectively more dilute than a single-valley system because of its smaller Fermi energy.