Emergence of a Sharp Quantum Collective Mode in a One-Dimensional Fermi Polaron
| Autor: | Yi-Fan Qu, Tao Shi, Mikhail B. Zvonarev, Eugene Demler, Pavel E. Dolgirev |
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| Přispěvatelé: | Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
[PHYS]Physics [physics] Condensed Matter::Quantum Gases Condensed matter physics QC1-999 General Physics and Astronomy FOS: Physical sciences Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Polaron 01 natural sciences 010305 fluids & plasmas Impurity Quantum Gases (cond-mat.quant-gas) Condensed Matter::Superconductivity 0103 physical sciences Collective mode Condensed Matter::Strongly Correlated Electrons 010306 general physics Condensed Matter - Quantum Gases Quantum Excitation Fermi Gamma-ray Space Telescope |
| Zdroj: | Physical Review X, Vol 11, Iss 4, p 041015 (2021) Physical Review X Physical Review X, American Physical Society, 2021, 11 (4), ⟨10.1103/PhysRevX.11.041015⟩ Physical Review X, 11 (4) |
| ISSN: | 2160-3308 |
| DOI: | 10.1103/PhysRevX.11.041015⟩ |
| Popis: | The Fermi-polaron problem of a mobile impurity interacting with fermionic medium emerges in various contexts, ranging from the foundations of Landau's Fermi-liquid theory to electron-exciton interaction in semiconductors, to unusual properties of high-temperature superconductors. While classically the medium provides only a dissipative environment to the impurity, the quantum picture of polaronic dressing is more intricate and arises from the interplay of few- and many-body aspects of the problem. The conventional expectation for the dynamics of Fermi polarons is that it is dissipative in character, and any excess energy is rapidly emitted away from the impurity as particle-hole excitations. Here we report a strikingly different type of polaron dynamics in a one-dimensional system of the impurity interacting repulsively with the fermions. When the total momentum of the system equals the Fermi momentum, there emerges a sharp collective mode corresponding to long-lived oscillations of the polaronic cloud surrounding the impurity. This mode can be observed experimentally with ultracold atoms using Ramsey interferometry and radio-frequency spectroscopy. Physical Review X, 11 (4) ISSN:2160-3308 |
| Databáze: | OpenAIRE |
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