Bose polarons near quantum criticality
Top Cited Papers
- 10 April 2020
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 368 (6487), 190-+
- https://doi.org/10.1126/science.aax5850
Abstract
The emergence of quasiparticles in interacting matter represents one of the cornerstones of modern physics. However, in the vicinity of a quantum critical point, the existence of quasiparticles comes under question. Here, we created Bose polarons near quantum criticality by immersing atomic impurities in a Bose-Einstein condensate (BEC) with near-resonant interactions. Using radiofrequency spectroscopy, we probed the energy, spectral width, and short-range correlations of the impurities as a function of temperature. Far below the superfluid critical temperature, the impurities formed well-defined quasiparticles. Their inverse lifetime, given by their spectral width, increased linearly with temperature at the so-called Planckian scale, consistent with quantum critical behavior. Close to the BEC critical temperature, the spectral width exceeded the impurity's binding energy, signaling a breakdown of the quasiparticle picture.Funding Information
- National Science Foundation
- David and Lucile Packard Foundation
- Air Force Office of Scientific Research
- Army Research Office
- Gordon and Betty Moore Foundation (GBMF5279)
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