Double Nuclear Spin Relaxation in Hybrid Quantum Hall Systems

TL;DR

This paper investigates the relaxation dynamics of a double nuclear spin ensemble coupled to Nambu-Goldstone bosons in GaAs semiconductors, revealing both collective superradiant decay and individual thermalization effects in a solid-state quantum system.

Contribution

It demonstrates the coexistence of collective and individual relaxation processes in a hybrid nuclear spin system, highlighting superradiant decay in solid-state quantum regimes.

Findings

Observation of superradiant decay in nuclear spins

Identification of distinct collective and individual relaxation timescales

Potential for exploring novel collective behaviors in solid-state quantum systems

Abstract

Recent advances in quantum engineering have given us the ability to design hybrid systems with novel properties normally not present in the regime they operate in. The coupling of spin ensembles and magnons to microwave resonators has for instance lead to a much richer understanding of collective effects in these systems and their potential quantum applications. We can also hybridize electron and nuclear spin ensembles together in the solid-state regime to investigate collective effects normally only observed in the atomic, molecular and optical world. Here we explore in the solid state regime the dynamics of a double domain nuclear spin ensemble coupled to the Nambu-Goldstone boson in GaAs semiconductors and show it exhibits both collective and individual relaxation (thermalization) on very different time scales. Further the collective relaxation of the nuclear spin ensemble is what one would expect from superradiant decay. This opens up the possibility for the exploration of novel collective behaviour in solid state systems where the natural energies associated with those spins are much less than the thermal energy.