Spontaneous light-mediated magnetism in cold atoms

I. Krešić, G. Labeyrie, G.R.M. Robb, G.-L. Oppo, P.M. Gomes, P. Griffin, R. Kaiser, T. Ackemann

Research output: Contribution to journalArticle

Abstract

Cold atom setups are now commonly employed in simulations of condensed matter phenomena. We present a novel approach to induce strong magnetic interactions between atoms on a self-organized lattice using diffraction of light. Diffractive propagation of structured light fields leads to an exchange between phase and amplitude modulated planes which can be used to couple atomic degrees of freedom via optical pumping nonlinearities. In the experiment a cold cloud of Rb atoms placed near a retro-reflecting mirror is driven by a detuned pump laser. We demonstrate spontaneous magnetic ordering in the Zeeman sublevels of the atomic ground state: anti-ferromagnetic structures on a square lattice and ferrimagnetic structures on a hexagonal lattice in zero and a weak longitudinal magnetic field, respectively. The ordered state is destroyed by a transverse magnetic field via coherent dynamics. A connection to the transverse (quantum) Ising model is drawn.
LanguageEnglish
Article number33
Number of pages9
JournalCommunications Physics
Volume1
DOIs
Publication statusPublished - 10 Jul 2018

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atoms
optical pumping
magnetic fields
Ising model
degrees of freedom
nonlinearity
pumps
mirrors
ground state
propagation
diffraction
lasers
simulation
interactions

Keywords

  • cold atoms
  • magnetic interactions
  • optical lattices

Cite this

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title = "Spontaneous light-mediated magnetism in cold atoms",
abstract = "Cold atom setups are now commonly employed in simulations of condensed matter phenomena. We present a novel approach to induce strong magnetic interactions between atoms on a self-organized lattice using diffraction of light. Diffractive propagation of structured light fields leads to an exchange between phase and amplitude modulated planes which can be used to couple atomic degrees of freedom via optical pumping nonlinearities. In the experiment a cold cloud of Rb atoms placed near a retro-reflecting mirror is driven by a detuned pump laser. We demonstrate spontaneous magnetic ordering in the Zeeman sublevels of the atomic ground state: anti-ferromagnetic structures on a square lattice and ferrimagnetic structures on a hexagonal lattice in zero and a weak longitudinal magnetic field, respectively. The ordered state is destroyed by a transverse magnetic field via coherent dynamics. A connection to the transverse (quantum) Ising model is drawn.",
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Spontaneous light-mediated magnetism in cold atoms. / Krešić, I.; Labeyrie, G.; Robb, G.R.M.; Oppo, G.-L.; Gomes, P.M.; Griffin, P.; Kaiser, R.; Ackemann, T.

In: Communications Physics, Vol. 1, 33, 10.07.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Spontaneous light-mediated magnetism in cold atoms

AU - Krešić, I.

AU - Labeyrie, G.

AU - Robb, G.R.M.

AU - Oppo, G.-L.

AU - Gomes, P.M.

AU - Griffin, P.

AU - Kaiser, R.

AU - Ackemann, T.

PY - 2018/7/10

Y1 - 2018/7/10

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AB - Cold atom setups are now commonly employed in simulations of condensed matter phenomena. We present a novel approach to induce strong magnetic interactions between atoms on a self-organized lattice using diffraction of light. Diffractive propagation of structured light fields leads to an exchange between phase and amplitude modulated planes which can be used to couple atomic degrees of freedom via optical pumping nonlinearities. In the experiment a cold cloud of Rb atoms placed near a retro-reflecting mirror is driven by a detuned pump laser. We demonstrate spontaneous magnetic ordering in the Zeeman sublevels of the atomic ground state: anti-ferromagnetic structures on a square lattice and ferrimagnetic structures on a hexagonal lattice in zero and a weak longitudinal magnetic field, respectively. The ordered state is destroyed by a transverse magnetic field via coherent dynamics. A connection to the transverse (quantum) Ising model is drawn.

KW - cold atoms

KW - magnetic interactions

KW - optical lattices

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