Inversion symmetry breaking in spin patterns by a weak magnetic field

I. Krešić, G. R. M. Robb, G. Labeyrie, R. Kaiser, T. Ackemann

Research output: Contribution to journalArticle

Abstract

Laser driven cold atoms near a plane retro-reflecting mirror exhibit self-organization above a pump threshold. We analyze the properties of self-organized spin patterns in the ground state of cold rubidium atoms. Antiferromagnetic patterns in zero magnetic field give way to ferrimagnetic patterns if a small longitudinal field is applied. We demonstrate how the experimental system can be modeled as spin-1 atoms diffractively coupled by the light reflected by the mirror. The roles of both dipolar and quadrupolar magnetization components in determining the threshold and symmetry variations with a weak longitudinal magnetic field are examined. Although the magnetic structures correspond dominantly to a lattice of magnetic dipoles, the symmetry breaking to ferrimagnetic structures in a finite field is mediated by the coupling to a homogenous quadrupole (alignment), not possible in a spin-1/2 system. Our study provides a basis for further exploration of instabilities in driven multilevel systems with feedback.
LanguageEnglish
Article number053851
Number of pages13
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume99
Issue number5
DOIs
Publication statusPublished - 30 May 2019

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broken symmetry
inversions
magnetic fields
mirrors
atoms
thresholds
rubidium
magnetic dipoles
quadrupoles
alignment
pumps
magnetization
ground state
symmetry
lasers

Keywords

  • spin patterns
  • cold rubidium atoms
  • zero magnetic field

Cite this

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title = "Inversion symmetry breaking in spin patterns by a weak magnetic field",
abstract = "Laser driven cold atoms near a plane retro-reflecting mirror exhibit self-organization above a pump threshold. We analyze the properties of self-organized spin patterns in the ground state of cold rubidium atoms. Antiferromagnetic patterns in zero magnetic field give way to ferrimagnetic patterns if a small longitudinal field is applied. We demonstrate how the experimental system can be modeled as spin-1 atoms diffractively coupled by the light reflected by the mirror. The roles of both dipolar and quadrupolar magnetization components in determining the threshold and symmetry variations with a weak longitudinal magnetic field are examined. Although the magnetic structures correspond dominantly to a lattice of magnetic dipoles, the symmetry breaking to ferrimagnetic structures in a finite field is mediated by the coupling to a homogenous quadrupole (alignment), not possible in a spin-1/2 system. Our study provides a basis for further exploration of instabilities in driven multilevel systems with feedback.",
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Inversion symmetry breaking in spin patterns by a weak magnetic field. / Krešić, I.; Robb, G. R. M.; Labeyrie, G.; Kaiser, R.; Ackemann, T.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 99, No. 5, 053851, 30.05.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Inversion symmetry breaking in spin patterns by a weak magnetic field

AU - Krešić, I.

AU - Robb, G. R. M.

AU - Labeyrie, G.

AU - Kaiser, R.

AU - Ackemann, T.

PY - 2019/5/30

Y1 - 2019/5/30

N2 - Laser driven cold atoms near a plane retro-reflecting mirror exhibit self-organization above a pump threshold. We analyze the properties of self-organized spin patterns in the ground state of cold rubidium atoms. Antiferromagnetic patterns in zero magnetic field give way to ferrimagnetic patterns if a small longitudinal field is applied. We demonstrate how the experimental system can be modeled as spin-1 atoms diffractively coupled by the light reflected by the mirror. The roles of both dipolar and quadrupolar magnetization components in determining the threshold and symmetry variations with a weak longitudinal magnetic field are examined. Although the magnetic structures correspond dominantly to a lattice of magnetic dipoles, the symmetry breaking to ferrimagnetic structures in a finite field is mediated by the coupling to a homogenous quadrupole (alignment), not possible in a spin-1/2 system. Our study provides a basis for further exploration of instabilities in driven multilevel systems with feedback.

AB - Laser driven cold atoms near a plane retro-reflecting mirror exhibit self-organization above a pump threshold. We analyze the properties of self-organized spin patterns in the ground state of cold rubidium atoms. Antiferromagnetic patterns in zero magnetic field give way to ferrimagnetic patterns if a small longitudinal field is applied. We demonstrate how the experimental system can be modeled as spin-1 atoms diffractively coupled by the light reflected by the mirror. The roles of both dipolar and quadrupolar magnetization components in determining the threshold and symmetry variations with a weak longitudinal magnetic field are examined. Although the magnetic structures correspond dominantly to a lattice of magnetic dipoles, the symmetry breaking to ferrimagnetic structures in a finite field is mediated by the coupling to a homogenous quadrupole (alignment), not possible in a spin-1/2 system. Our study provides a basis for further exploration of instabilities in driven multilevel systems with feedback.

KW - spin patterns

KW - cold rubidium atoms

KW - zero magnetic field

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DO - 10.1103/PhysRevA.99.053851

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