Einstein--de Haas fluctuation of a nanoparticle in spin polarized gases

TL;DR

This paper presents a theoretical model describing how angular momentum transfer from a spin-polarized gas induces rotational motion in a nanoparticle, enabling potential control of nano-spintronic systems in gaseous environments.

Contribution

It introduces a microscopic spin tunneling model and derives a stochastic differential equation to describe angular momentum transfer to nanoparticles in gases.

Findings

AM transfer rate can be inferred from the SDE

Model links microscopic spin tunneling to macroscopic rotation

Potential for manipulating nano-spintronic systems

Abstract

We theoretically study angular momentum (AM) transfer from a spin-polarized dilute gas into an nanoparitcle (NP) tightly trapped in optical tweezers. We formulate a microscopic model based on the spin tunneling Hamiltonian method and derive a macroscopic stochastic differential equation (SDE) which governs the AM-transfer-induced rotational motion of the NP. It is shown that the AM transfer rate at the NP surface can be extracted via the inference of the SDE. This work will open the door to the manipulation of nano-spintronic systems in gaseous environments.