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Title: Cross-correlation spin noise spectroscopy of heterogeneous interacting spin systems

Abstract

Interacting multi-component spin systems are ubiquitous in nature and in the laboratory. As such, investigations of inter-species spin interactions are of vital importance. Traditionally, they are studied by experimental methods that are necessarily perturbative: e.g., by intentionally polarizing or depolarizing one spin species while detecting the response of the other(s). Here, we describe and demonstrate an alternative approach based on multi-probe spin noise spectroscopy, which can reveal inter-species spin interactions - under conditions of strict thermal equilibrium - by detecting and cross-correlating the stochastic fluctuation signals exhibited by each of the constituent spin species. Specifically, we consider a two-component spin ensemble that interacts via exchange coupling, and we determine cross-correlations between their intrinsic spin fluctuations. The model is experimentally confirmed using “two-color” optical spin noise spectroscopy on a mixture of interacting Rb and Cs vapors. Noise correlations directly reveal the presence of inter-species spin exchange, without ever perturbing the system away from thermal equilibrium. These non-invasive and noise-based techniques should be generally applicable to any heterogeneous spin system in which the fluctuations of the constituent components are detectable.

Authors:
 [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1200894
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Roy, Dibyendu, Yang, Luyi, Crooker, Scott A., and Sinitsyn, Nikolai A. Cross-correlation spin noise spectroscopy of heterogeneous interacting spin systems. United States: N. p., 2015. Web. doi:10.1038/srep09573.
Roy, Dibyendu, Yang, Luyi, Crooker, Scott A., & Sinitsyn, Nikolai A. Cross-correlation spin noise spectroscopy of heterogeneous interacting spin systems. United States. https://doi.org/10.1038/srep09573
Roy, Dibyendu, Yang, Luyi, Crooker, Scott A., and Sinitsyn, Nikolai A. 2015. "Cross-correlation spin noise spectroscopy of heterogeneous interacting spin systems". United States. https://doi.org/10.1038/srep09573. https://www.osti.gov/servlets/purl/1200894.
@article{osti_1200894,
title = {Cross-correlation spin noise spectroscopy of heterogeneous interacting spin systems},
author = {Roy, Dibyendu and Yang, Luyi and Crooker, Scott A. and Sinitsyn, Nikolai A.},
abstractNote = {Interacting multi-component spin systems are ubiquitous in nature and in the laboratory. As such, investigations of inter-species spin interactions are of vital importance. Traditionally, they are studied by experimental methods that are necessarily perturbative: e.g., by intentionally polarizing or depolarizing one spin species while detecting the response of the other(s). Here, we describe and demonstrate an alternative approach based on multi-probe spin noise spectroscopy, which can reveal inter-species spin interactions - under conditions of strict thermal equilibrium - by detecting and cross-correlating the stochastic fluctuation signals exhibited by each of the constituent spin species. Specifically, we consider a two-component spin ensemble that interacts via exchange coupling, and we determine cross-correlations between their intrinsic spin fluctuations. The model is experimentally confirmed using “two-color” optical spin noise spectroscopy on a mixture of interacting Rb and Cs vapors. Noise correlations directly reveal the presence of inter-species spin exchange, without ever perturbing the system away from thermal equilibrium. These non-invasive and noise-based techniques should be generally applicable to any heterogeneous spin system in which the fluctuations of the constituent components are detectable.},
doi = {10.1038/srep09573},
url = {https://www.osti.gov/biblio/1200894}, journal = {Scientific Reports},
issn = {2045-2322},
number = ,
volume = 5,
place = {United States},
year = {Thu Apr 30 00:00:00 EDT 2015},
month = {Thu Apr 30 00:00:00 EDT 2015}
}

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Cited by: 24 works
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Works referencing / citing this record:

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