Junior Researcher
Research Interests:
Ultracold Quantum Gases: Bose-Einstein condensation (BEC), polarons in quantum and solid state gases, quantum mixtures, strongly correlated many-body systems and quantum simulation; Quantum Optics and Quantum Simulation
Personal website:
https://cqm.unicam.it/luisardila
Selected publications:
Grusdt, F; Mostaan, N; Demler, E; Ardila, Luis A. Peña
Impurities and polarons in bosonic quantum gases: a review on recent progress Journal Article
In: Rep. Prog. Phys., vol. 88, no. 6, 2025, ISSN: 1361-6633.
@article{Grusdt2025,
title = {Impurities and polarons in bosonic quantum gases: a review on recent progress},
author = {F Grusdt and N Mostaan and E Demler and Luis A. Peña Ardila},
doi = {10.1088/1361-6633/add94b},
issn = {1361-6633},
year = {2025},
date = {2025-06-01},
urldate = {2025-06-01},
journal = {Rep. Prog. Phys.},
volume = {88},
number = {6},
publisher = {IOP Publishing},
abstract = {<jats:title>Abstract</jats:title>
<jats:p>This review describes the field of Bose polarons, arising when mobile impurities are immersed into a bosonic quantum gas. The latter can be realized by a Bose–Einstein condensate of ultracold atoms, or of exciton polaritons in a semiconductor, which has led to a series of experimental observations of Bose polarons near inter-species Feshbach resonances that we survey. Following an introduction to the topic, with references to its historic roots and a presentation of the Bose polaron Hamiltonian, we summarize state-of-the-art experiments. Next we provide a detailed discussion of polaron models, starting from the ubiquitous Fröhlich Hamiltonian that applies at weak couplings. Already this highly simplified model allows insights into ultra-violet divergencies, logarithmic and power-law, that need to be properly regularized. To capture the physics near a Feshbach resonance, two-phonon scattering terms on the impurity as well as phonon-phonon interactions need to be included. We proceed by a survey of concurrent theoretical methods used for solving strongly interacting Bose polaron problems, ranging from Lee–Low–Pines mean-field theory, Chevy-ansatz, Gross–Pitaevskii-equation to diagrammatic Monte Carlo approaches. The subsequent sections are devoted to the large bodies of work investigating strong coupling Bose polarons, including detailed comparisons with radio-frequency spectra obtained in ultracold atom experiments; to investigations of universal few-body and Efimov states associated with a Feshbach resonance in atomic mixtures; to studies of quantum dynamics and polarons out of equilibrium; Bose polarons in low-dimensional 1D and 2D quantum systems; induced interactions among polarons and bipolaron formation; and to Bose polarons at non-zero temperatures. We end our review by detailed discussions of closely related experimental setups and systems, including ionic impurities, systems with strong light-matter interactions, and variations and extensions of the Bose polaron concepts e.g. to baths with topological order or strong interactions relevant for correlated electrons. Finally, an outlook is presented, highlighting possible future research directions and open questions in the field as a whole.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:title>Abstract</jats:title>
<jats:p>This review describes the field of Bose polarons, arising when mobile impurities are immersed into a bosonic quantum gas. The latter can be realized by a Bose–Einstein condensate of ultracold atoms, or of exciton polaritons in a semiconductor, which has led to a series of experimental observations of Bose polarons near inter-species Feshbach resonances that we survey. Following an introduction to the topic, with references to its historic roots and a presentation of the Bose polaron Hamiltonian, we summarize state-of-the-art experiments. Next we provide a detailed discussion of polaron models, starting from the ubiquitous Fröhlich Hamiltonian that applies at weak couplings. Already this highly simplified model allows insights into ultra-violet divergencies, logarithmic and power-law, that need to be properly regularized. To capture the physics near a Feshbach resonance, two-phonon scattering terms on the impurity as well as phonon-phonon interactions need to be included. We proceed by a survey of concurrent theoretical methods used for solving strongly interacting Bose polaron problems, ranging from Lee–Low–Pines mean-field theory, Chevy-ansatz, Gross–Pitaevskii-equation to diagrammatic Monte Carlo approaches. The subsequent sections are devoted to the large bodies of work investigating strong coupling Bose polarons, including detailed comparisons with radio-frequency spectra obtained in ultracold atom experiments; to investigations of universal few-body and Efimov states associated with a Feshbach resonance in atomic mixtures; to studies of quantum dynamics and polarons out of equilibrium; Bose polarons in low-dimensional 1D and 2D quantum systems; induced interactions among polarons and bipolaron formation; and to Bose polarons at non-zero temperatures. We end our review by detailed discussions of closely related experimental setups and systems, including ionic impurities, systems with strong light-matter interactions, and variations and extensions of the Bose polaron concepts e.g. to baths with topological order or strong interactions relevant for correlated electrons. Finally, an outlook is presented, highlighting possible future research directions and open questions in the field as a whole.</jats:p>
<jats:p>This review describes the field of Bose polarons, arising when mobile impurities are immersed into a bosonic quantum gas. The latter can be realized by a Bose–Einstein condensate of ultracold atoms, or of exciton polaritons in a semiconductor, which has led to a series of experimental observations of Bose polarons near inter-species Feshbach resonances that we survey. Following an introduction to the topic, with references to its historic roots and a presentation of the Bose polaron Hamiltonian, we summarize state-of-the-art experiments. Next we provide a detailed discussion of polaron models, starting from the ubiquitous Fröhlich Hamiltonian that applies at weak couplings. Already this highly simplified model allows insights into ultra-violet divergencies, logarithmic and power-law, that need to be properly regularized. To capture the physics near a Feshbach resonance, two-phonon scattering terms on the impurity as well as phonon-phonon interactions need to be included. We proceed by a survey of concurrent theoretical methods used for solving strongly interacting Bose polaron problems, ranging from Lee–Low–Pines mean-field theory, Chevy-ansatz, Gross–Pitaevskii-equation to diagrammatic Monte Carlo approaches. The subsequent sections are devoted to the large bodies of work investigating strong coupling Bose polarons, including detailed comparisons with radio-frequency spectra obtained in ultracold atom experiments; to investigations of universal few-body and Efimov states associated with a Feshbach resonance in atomic mixtures; to studies of quantum dynamics and polarons out of equilibrium; Bose polarons in low-dimensional 1D and 2D quantum systems; induced interactions among polarons and bipolaron formation; and to Bose polarons at non-zero temperatures. We end our review by detailed discussions of closely related experimental setups and systems, including ionic impurities, systems with strong light-matter interactions, and variations and extensions of the Bose polaron concepts e.g. to baths with topological order or strong interactions relevant for correlated electrons. Finally, an outlook is presented, highlighting possible future research directions and open questions in the field as a whole.</jats:p>
Levinsen, J; Ardila, Luis A. Peña; Yoshida, S M.; Parish, M M.
Quantum Behavior of a Heavy Impurity Strongly Coupled to a Bose Gas Journal Article
In: Phys. Rev. Lett., vol. 127, no. 3, 2021, ISSN: 1079-7114.
@article{Levinsen2021,
title = {Quantum Behavior of a Heavy Impurity Strongly Coupled to a Bose Gas},
author = {J Levinsen and Luis A. Peña Ardila and S M. Yoshida and M M. Parish},
doi = {10.1103/physrevlett.127.033401},
issn = {1079-7114},
journal = {Phys. Rev. Lett.},
volume = {127},
number = {3},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ardila, Luis A. Peña; Jørgensen, N. B.; Pohl, T.; Giorgini, S.; Bruun, G. M.; Arlt, J. J.
Analyzing a Bose polaron across resonant interactions Journal Article
In: Phys. Rev. A, vol. 99, no. 6, 2019, ISSN: 2469-9934.
@article{PeñaArdila2019,
title = {Analyzing a Bose polaron across resonant interactions},
author = {Luis A. Peña Ardila and N. B. Jørgensen and T. Pohl and S. Giorgini and G. M. Bruun and J. J. Arlt},
doi = {10.1103/physreva.99.063607},
issn = {2469-9934},
journal = {Phys. Rev. A},
volume = {99},
number = {6},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Camacho-Guardian, A.; Ardila, Luis A. Peña; Pohl, T.; Bruun, G. M.
Bipolarons in a Bose-Einstein Condensate Journal Article
In: Phys. Rev. Lett., vol. 121, no. 1, 2018, ISSN: 1079-7114.
@article{Camacho-Guardian2018,
title = {Bipolarons in a Bose-Einstein Condensate},
author = {A. Camacho-Guardian and Luis A. Peña Ardila and T. Pohl and G. M. Bruun},
doi = {10.1103/physrevlett.121.013401},
issn = {1079-7114},
journal = {Phys. Rev. Lett.},
volume = {121},
number = {1},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Astrakharchik, G. E.; Ardila, Luis A. Peña; Jachymski, K; Negretti, A
Many-body bound states and induced interactions of charged impurities in a bosonic bath Journal Article
In: Nat Commun, vol. 14, no. 1, 2023, ISSN: 2041-1723.
@article{Astrakharchik2023,
title = {Many-body bound states and induced interactions of charged impurities in a bosonic bath},
author = {G. E. Astrakharchik and Luis A. Peña Ardila and K Jachymski and A Negretti},
doi = {10.1038/s41467-023-37153-0},
issn = {2041-1723},
journal = {Nat Commun},
volume = {14},
number = {1},
publisher = {Springer Science and Business Media LLC},
abstract = {<jats:title>Abstract</jats:title><jats:p>Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this problem. Here, we investigate the static properties of one and two ionic impurities in a bosonic bath using quantum Monte Carlo methods. We identify three bipolaronic regimes depending on the strength of the atom-ion potential and the number of its two-body bound states: a perturbative regime resembling the situation of a pair of neutral impurities, a non-perturbative regime that loses the quasi-particle character of the former, and a many-body bound state regime that can arise only in the presence of a bound state in the two-body potential. We further reveal strong bath-induced interactions between the two ionic polarons. Our findings show that numerical simulations are indispensable for describing highly correlated impurity models.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:title>Abstract</jats:title><jats:p>Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this problem. Here, we investigate the static properties of one and two ionic impurities in a bosonic bath using quantum Monte Carlo methods. We identify three bipolaronic regimes depending on the strength of the atom-ion potential and the number of its two-body bound states: a perturbative regime resembling the situation of a pair of neutral impurities, a non-perturbative regime that loses the quasi-particle character of the former, and a many-body bound state regime that can arise only in the presence of a bound state in the two-body potential. We further reveal strong bath-induced interactions between the two ionic polarons. Our findings show that numerical simulations are indispensable for describing highly correlated impurity models.</jats:p>
Biography
PhD from the Pitaevskii Center on BEC, University of Trento (2015). I held postdoctoral positions at the Max Planck Institute for the Physics of Complex Systems in Germany (2015-2017), Aarhus University in Denmark (2017-2019), and Hannover University in Germany (2019-2022). In 2023, I joined the University of Camerino as a Junior Assistant Professor (RTDa). In 2024, I joined the University of Trieste Physics Department as a Tenure-Track Assistant Professor (RTDb). My area of expertise and research interest is focused on atomic, molecular, and quantum optics, particularly in their intersection with condensed matter physics.