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Bose Polarons in the Strongly Interacting Regime

Ming-Guang Hu, Michael J. Van de Graaff, Dhruv Kedar, John P. Corson, Eric A. Cornell, and Deborah S. Jin
Phys. Rev. Lett. 117, 055301 – Published 28 July 2016
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Abstract

When an impurity is immersed in a Bose-Einstein condensate, impurity-boson interactions are expected to dress the impurity into a quasiparticle, the Bose polaron. We superimpose an ultracold atomic gas of Rb87 with a much lower density gas of fermionic K40 impurities. Through the use of a Feshbach resonance and radio-frequency spectroscopy, we characterize the energy, spectral width, and lifetime of the resultant polaron on both the attractive and the repulsive branches in the strongly interacting regime. The width of the polaron in the attractive branch is narrow compared to its binding energy, even as the two-body scattering length diverges.

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  • Received 3 May 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.055301

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

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Bose Polarons that Strongly Interact

Published 28 July 2016

Researchers have used impurities within a Bose-Einstein condensate to simulate polarons—electron-phonon combinations in solid-state systems.

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Authors & Affiliations

Ming-Guang Hu, Michael J. Van de Graaff, Dhruv Kedar, John P. Corson, Eric A. Cornell, and Deborah S. Jin

  • JILA, NIST, and University of Colorado, Boulder, Colorado 80309, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA

See Also

Observation of Attractive and Repulsive Polarons in a Bose-Einstein Condensate

Nils B. Jørgensen, Lars Wacker, Kristoffer T. Skalmstang, Meera M. Parish, Jesper Levinsen, Rasmus S. Christensen, Georg M. Bruun, and Jan J. Arlt
Phys. Rev. Lett. 117, 055302 (2016)

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Vol. 117, Iss. 5 — 29 July 2016

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