Self-organization in cold atoms mediated by diffractive coupling
Ackemann, Thorsten and Labeyrie, Guillaume and Baio, Giuseppe and Krešić, Ivor and Walker, Josh G. M. and Costa Boquete, Adrian and Griffin, Paul and Firth, William J. and Kaiser, Robin and Oppo, Gian-Luca and Robb, Gordon R.M. (2021) Self-organization in cold atoms mediated by diffractive coupling. Atoms, 9 (3). 35. ISSN 2218-2004 (https://doi.org/10.3390/atoms9030035)
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Abstract
This article discusses self-organization in cold atoms via light-mediated interactions induced by feedback from a single retro-reflecting mirror. Diffractive dephasing between the pump beam and the spontaneous sidebands selects the lattice period. Spontaneous breaking of the rotational and translational symmetry occur in the 2D plane transverse to the pump. We elucidate how diffractive ripples couple sites on the self-induced atomic lattice. The nonlinear phase shift of the atomic cloud imprinted onto the optical beam is the parameter determining coupling strength. The interaction can be tailored to operate either on external degrees of freedom leading to atomic crystallization for thermal atoms and supersolids for a quantum degenerate gas, or on internal degrees of freedom like populations of the excited state or Zeeman sublevels. Using the light polarization degrees of freedom on the Poincaré sphere (helicity and polarization direction), specific irreducible tensor components of the atomic Zeeman states can be coupled leading to spontaneous magnetic ordering of states of dipolar and quadrupolar nature. The requirements for critical interaction strength are compared for the different situations. Connections and extensions to longitudinally pumped cavities, counterpropagating beam schemes and the CARL instability are discussed.
ORCID iDs
Ackemann, Thorsten ORCID: https://orcid.org/0000-0003-2727-7395, Labeyrie, Guillaume, Baio, Giuseppe, Krešić, Ivor ORCID: https://orcid.org/0000-0001-8349-4605, Walker, Josh G. M. ORCID: https://orcid.org/0000-0001-5966-0183, Costa Boquete, Adrian, Griffin, Paul ORCID: https://orcid.org/0000-0002-0134-7554, Firth, William J., Kaiser, Robin, Oppo, Gian-Luca ORCID: https://orcid.org/0000-0002-5376-4309 and Robb, Gordon R.M. ORCID: https://orcid.org/0000-0002-3004-5926;-
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Item type: Article ID code: 76791 Dates: DateEvent23 June 2021Published9 June 2021AcceptedSubjects: Science > Physics Department: Faculty of Science > Physics
Strategic Research Themes > Ocean, Air and SpaceDepositing user: Pure Administrator Date deposited: 16 Jun 2021 09:26 Last modified: 23 Sep 2024 00:51 URI: https://strathprints.strath.ac.uk/id/eprint/76791