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Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture

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Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture. / Fritsche, Isabella; Baroni, Cosetta; Dobler, Erich; Kirilov, Emil; Huang, Bo; Grimm, Rudolf; Bruun, Georg M.; Massignan, Pietro.

I: Physical Review A, Bind 103, Nr. 5, 053314, 05.2021.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Fritsche, I, Baroni, C, Dobler, E, Kirilov, E, Huang, B, Grimm, R, Bruun, GM & Massignan, P 2021, 'Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture', Physical Review A, bind 103, nr. 5, 053314. https://doi.org/10.1103/PhysRevA.103.053314

APA

Fritsche, I., Baroni, C., Dobler, E., Kirilov, E., Huang, B., Grimm, R., Bruun, G. M., & Massignan, P. (2021). Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture. Physical Review A, 103(5), [053314]. https://doi.org/10.1103/PhysRevA.103.053314

CBE

Fritsche I, Baroni C, Dobler E, Kirilov E, Huang B, Grimm R, Bruun GM, Massignan P. 2021. Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture. Physical Review A. 103(5):Article 053314. https://doi.org/10.1103/PhysRevA.103.053314

MLA

Vancouver

Fritsche I, Baroni C, Dobler E, Kirilov E, Huang B, Grimm R o.a. Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture. Physical Review A. 2021 maj;103(5). 053314. https://doi.org/10.1103/PhysRevA.103.053314

Author

Fritsche, Isabella ; Baroni, Cosetta ; Dobler, Erich ; Kirilov, Emil ; Huang, Bo ; Grimm, Rudolf ; Bruun, Georg M. ; Massignan, Pietro. / Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture. I: Physical Review A. 2021 ; Bind 103, Nr. 5.

Bibtex

@article{907e839068bc45f19f8f885ee56d4c0c,
title = "Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture",
abstract = "We investigate the properties of a strongly interacting imbalanced mixture of bosonic K41 impurities immersed in a Fermi sea of ultracold Li6 atoms. This enables us to explore the Fermi polaron scenario for large impurity concentrations including the case where they form a Bose-Einstein condensate. The system is characterized by means of radio-frequency injection spectroscopy and interspecies interactions are widely tunable by means of a well-characterized Feshbach resonance. We find that the energy of the Fermi polarons formed in the thermal fraction of the impurity cloud remains rather insensitive to the impurity concentration, even as we approach equal densities for both species. The apparent insensitivity to high concentration is consistent with a theoretical prediction, based on Landau's quasiparticle theory, of weak effective interaction between the polarons. The condensed fraction of the bosonic K41 gas is much denser than its thermal component, which leads to a break-down of the Fermi polaron description. Instead, we observe a new branch in the radio-frequency spectrum with a small energy shift, which is consistent with the presence of Bose polarons formed by Li6 fermions inside the K41 condensate. A closer investigation of the behavior of the condensate by means of Rabi oscillation measurements supports this observation, indicating that we have realized Fermi and Bose polarons, two fundamentally different quasiparticles, in one cloud.",
author = "Isabella Fritsche and Cosetta Baroni and Erich Dobler and Emil Kirilov and Bo Huang and Rudolf Grimm and Bruun, {Georg M.} and Pietro Massignan",
note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",
year = "2021",
month = may,
doi = "10.1103/PhysRevA.103.053314",
language = "English",
volume = "103",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "5",

}

RIS

TY - JOUR

T1 - Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture

AU - Fritsche, Isabella

AU - Baroni, Cosetta

AU - Dobler, Erich

AU - Kirilov, Emil

AU - Huang, Bo

AU - Grimm, Rudolf

AU - Bruun, Georg M.

AU - Massignan, Pietro

N1 - Publisher Copyright: © 2021 American Physical Society. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/5

Y1 - 2021/5

N2 - We investigate the properties of a strongly interacting imbalanced mixture of bosonic K41 impurities immersed in a Fermi sea of ultracold Li6 atoms. This enables us to explore the Fermi polaron scenario for large impurity concentrations including the case where they form a Bose-Einstein condensate. The system is characterized by means of radio-frequency injection spectroscopy and interspecies interactions are widely tunable by means of a well-characterized Feshbach resonance. We find that the energy of the Fermi polarons formed in the thermal fraction of the impurity cloud remains rather insensitive to the impurity concentration, even as we approach equal densities for both species. The apparent insensitivity to high concentration is consistent with a theoretical prediction, based on Landau's quasiparticle theory, of weak effective interaction between the polarons. The condensed fraction of the bosonic K41 gas is much denser than its thermal component, which leads to a break-down of the Fermi polaron description. Instead, we observe a new branch in the radio-frequency spectrum with a small energy shift, which is consistent with the presence of Bose polarons formed by Li6 fermions inside the K41 condensate. A closer investigation of the behavior of the condensate by means of Rabi oscillation measurements supports this observation, indicating that we have realized Fermi and Bose polarons, two fundamentally different quasiparticles, in one cloud.

AB - We investigate the properties of a strongly interacting imbalanced mixture of bosonic K41 impurities immersed in a Fermi sea of ultracold Li6 atoms. This enables us to explore the Fermi polaron scenario for large impurity concentrations including the case where they form a Bose-Einstein condensate. The system is characterized by means of radio-frequency injection spectroscopy and interspecies interactions are widely tunable by means of a well-characterized Feshbach resonance. We find that the energy of the Fermi polarons formed in the thermal fraction of the impurity cloud remains rather insensitive to the impurity concentration, even as we approach equal densities for both species. The apparent insensitivity to high concentration is consistent with a theoretical prediction, based on Landau's quasiparticle theory, of weak effective interaction between the polarons. The condensed fraction of the bosonic K41 gas is much denser than its thermal component, which leads to a break-down of the Fermi polaron description. Instead, we observe a new branch in the radio-frequency spectrum with a small energy shift, which is consistent with the presence of Bose polarons formed by Li6 fermions inside the K41 condensate. A closer investigation of the behavior of the condensate by means of Rabi oscillation measurements supports this observation, indicating that we have realized Fermi and Bose polarons, two fundamentally different quasiparticles, in one cloud.

UR - http://www.scopus.com/inward/record.url?scp=85106370060&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.103.053314

DO - 10.1103/PhysRevA.103.053314

M3 - Journal article

AN - SCOPUS:85106370060

VL - 103

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 5

M1 - 053314

ER -