Abstract
The Notion Of A Polaron, Originally Introduced In The Context Of Electrons In Ionic Lattices, Helps Us To Understand How A Quantum Impurity Behaves When Being Immersed In And Interacting With A Many-Body Background. We Discuss The Impact Of The Impurities On The Medium Particles By Considering Feedback Effects From Polarons That Can Be Realized In Ultracold Quantum Gas Experiments. In Particular, We Exemplify The Modifications Of The Medium In The Presence Of Either Fermi Or Bose Polarons. Regarding Fermi Polarons We Present A Corresponding Many-Body Diagrammatic Approach Operating At Finite Temperatures And Discuss How Mediated Two-And Three-Body Interactions Are Implemented Within This Framework. Utilizing This Approach, We Analyze The Behavior Of The Spectral Function Of Fermi Polarons At Finite Temperature By Varying Impurity-Medium Interactions As Well As Spatial Dimensions From Three To One. Interestingly, We Reveal That The Spectral Function Of The Medium Atoms Could Be A Useful Quantity For Analyzing The Transition/crossover From Attractive Polarons To Molecules In Three-Dimensions. As For The Bose Polaron, We Showcase The Depletion Of The Background Bose-Einstein Condensate In The Vicinity Of The Impurity Atom. Such Spatial Modulations Would Be Important For Future Investigations Regarding The Quantification Of Interpolaron Correlations In Bose Polaron Problems.
Recommended Citation
H. Tajima et al., "Polaron Problems In Ultracold Atoms: Role Of A Fermi Sea Across Different Spatial Dimensions And Quantum Fluctuations Of A Bose Medium," Atoms, vol. 9, no. 1, article no. 18, MDPI, Mar 2021.
The definitive version is available at https://doi.org/10.3390/atoms9010018
Department(s)
Physics
Publication Status
Open Access
Keywords and Phrases
Bose–Einstein condensate; Fermi degenerate gases; Impurity; Interpolaron correlations; Polaron; Quantum depletion; Spectroscopy of quasiparticles; Ultracold atoms
International Standard Serial Number (ISSN)
2218-2004
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2024 The Authors, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
01 Mar 2021
Comments
Japan Society for the Promotion of Science, Grant 17K05445