Manifestation of spin degrees of freedom in the double fractional quantum Hall system

TL;DR

This paper numerically investigates a double fractional quantum Hall system, revealing a novel spin-unpolarized quantum liquid and highlighting the role of spin in charge excitations, influenced by interlayer correlations.

Contribution

It predicts a new spin-unpolarized quantum liquid specific to multi-species systems and links spin states to inter-layer electron correlations.

Findings

Existence of a novel spin-unpolarized quantum liquid.

Spin involvement in charge-excitation modes.

Interlayer tunneling affects spin dynamics.

Abstract

The double fractional quantum Hall system of spin 1/2 electrons is numerically studied to predict that there exists a novel spin-unpolarized quantum liquid specific to the multi-species system, which exemplifies a link between the spin state and the inter-layer electron correlation. Even when the ground state is spin-polarized, the lowest charge-excitation mode involves the spin when the interlayer tunneling is considered.