Quantum many-body Theory and Simulation

Research Strand:

Theoretical and Computational Condensed-Matter Physics (Condensed Matter Physics)

I am interested in studying emerging quantum phenomena in different setups, ranging from atomic to solid-state systems:

—Quantum many-body systems.

—Ultracold quantum gases.

— Strongly Correlated Systems.

— Quantum simulation.

— Computational methods for many-particle problems.

More info:

Personal website

Head of Research Group

Head:

Luis A. Peña Ardila

Info

Research

Impurities and polarons in quantum neutral matter

Research on neutral impurities in quantum gases focuses on studying the behavior and effects of non-charged particles (neutral impurities) within ultra-cold atomic or molecular gases. These impurities are typically introduced into the quantum gas, and their interactions with the surrounding atoms or molecules are investigated. The study of neutral impurities in quantum gases has provided valuable insights into various physical phenomena, including quantum dynamics, quantum phase transitions, and many-body physics. This research is significant for understanding fundamental aspects of quantum systems and has potential applications in quantum computing, quantum simulation, and precision measurements.

Selected Publications

J. Levinsen, LAPA et.al. PRL (Edit. Sug) 127, 033401 (2021)

LAPA. PRA 103, 033323 (2021).

LAPA, N. B. Jørgensen, et.al, PRA 99. 063607 (2019).

A. Camacho-Guardian, LAPA, et.al, PRL. 121, 013401 (2018)

LAPA and S. Giorgini. PRA 92. 033612 (2015).

Exotic states of the matter

Quantum droplets and superfluid solids, also known as supersolids, are fascinating phenomena observed in ultracold quantum gases. Quantum droplets are stable, self-bound entities formed by interactions between particles in a gas. Unlike traditional droplets, which are held together by surface tension, quantum droplets arise due to quantum fluctuations and repulsive interparticle interactions. These droplets exhibit unique properties such as density profiles that are spatially localized, effectively behaving as a macroscopic quantum object. On the other hand, supersolids are intriguing states of matter that combine characteristics of both solids and superfluids. In supersolids, atoms arrange in a crystal-like lattice while simultaneously flowing as a superfluid. These exotic states emerge when the repulsive interactions between atoms are balanced with quantum fluctuations, resulting in simultaneous long-range order and coherence. The study of quantum droplets and supersolids in ultracold quantum gases offers valuable insights into the fundamental nature of matter and opens up possibilities for exploring novel quantum phenomena and potential applications in quantum technologies.

Selected Publications

T. Bland, E. Poli, LAPA, et.al., PRA 106 053322 (2022)

D. Edler, LAPA, et.al. PRR 4, 033017 (2022)

R. Bisset, LAPA, and L. Santos. PRL 126, 025301 (2021)

D. Scheiermann, LAPA, et.al.. arXiv:2202.08259 (2022).

Atom-ion quantum hybrid systems

Atom-ion systems in ultracold gases provide a unique platform for studying a wide range of intriguing phenomena in quantum physics. One fascinating aspect is the formation of ion Bose polaron and ion Fermi polaron complexes. In an ion Bose polaron, an impurity ion interacts with a surrounding gas of bosonic atoms. The strong attractive interaction between the ion and the bosons leads to the dressing of the ion by the bosonic cloud, effectively forming a quasiparticle. This dressing modifies the properties of the ion, such as its mass and spectral features, creating a novel hybrid state. Similarly, in an ion Fermi polaron, the impurity ion interacts with a gas of fermionic atoms. Due to the Pauli exclusion principle, the dressing effect is different compared to the Bose polaron case, resulting in distinct behaviors and characteristics. These atom-ion systems with ultracold gases offer rich opportunities for studying the physics of polaron formation, many-body interactions, and quantum impurity effects, contributing to our understanding of strongly correlated systems and opening up avenues for potential applications in quantum simulation and information processing.

Selected Publications

LAPA. Nat Rev Phys, 4, 214 (2022).

R. Pessoa, S. A. Vitiello, and LAPA . Phys. Rev. Lett. 133, 233002 (2024)

G. E. Astrakharchik, L. A. Peña Ardila, K. Jachymski, and A. Negretti. Nat. Commun. 14, 1647 (2023)

G. E. A and LAPA, et.al. Comm Phy. 4, 94 (2021)

Quantum phenomena in condensed matter systems

People

Publications

All publications are available on:

ALL PUBLICATIONS:

Charged impurities in a Bose-Einstein condensate: Many-body bound states and induced interactions. Grigory E. Astrakharchik and LAP Ardila, Krzysztof Jachymski & Antonio Negretti. Nat Commun. 14, 1647 (2023). https://doi.org/10.1038/s41467-023-37153-0

Catalyzation of supersolidity in binary dipolar condensates. D. Scheiermann, LAP Ardila, T. Bland, R. N. Bisset, and L. Santos. Phys. Rev. A (Letter) 107, L021302 (2023). https://doi.org/10.1103/PhysRevA.107.L021302.

Domain supersolids in binary dipolar condensates.T. Bland, E. Poli, LAP Ardila, L. Santos, F. Ferlaino, and R. N. Bisset. Phys. Rev. A 106, 053322 (2022) https://doi.org/10.1103/PhysRevA.106.053322

Universal Properties of Anisotropic Dipolar Bosons in Two Dimensions. J. Sánchez-Baena, LAP Ardila, G. Astrakharchik, F. Mazzanti. SciPost Phys. 13, 031 (2022). https://scipost.org/10.21468/SciPostPhys.13.2.031

Anomalous buoyancy of quantum bubbles in immiscible Bose mixtures. D. Edler, LAP Ardila, C. Cabrera and L. Santos. Phys. Rev. Research 4, 033017 (2022) https://doi.org/10.1103/PhysRevResearch.4.033017

Monte Carlo methods for impurity physics in ultracold Bose quantum gases. LAP Ardila. Nat Rev Phys , 4, 214-Tools of Trade (2022). https://doi.org/10.1038/s42254-022-00443-5.

Ultra-Dilute Gas of Polarons in a Bose–Einstein Condensates. LAP Ardila. Atoms 10 (29) (2022). https://doi.org/10.3390/atoms10010029.

Finite range effects in the unitary Fermi polaron. Renato Pessoa, S. A. Vitiello, and LAP Ardila. Phys. Rev. A 104, 043313 (2021). https://doi.org/10.1103/PhysRevA.104.043313.

Quantum Behavior of a Heavy Impurity Strongly Coupled to a Bose Gas. Jesper Levinsen, LAP Ardila, Shuhei M. Yoshida, and Meera M. Parish. Phys. Rev. Lett 127, 033401 (2021) - Editors’ suggestion. https://doi.org/10.1103/PhysRevLett.127.033401.

Dynamical formation of polarons in a Bose-Einstein condensate: A variational approach. LAP Ardila. Phys. Rev. A 103, 033323 (2021). https://doi.org/10.1103/PhysRevA.103.033323.

Quantum Droplets of Dipolar Mixtures. R. N. Bisset, LAP Ardila, and L. Santos. Phys. Rev. Lett 126, 025301 (2021). https://doi.org/10.1103/PhysRevLett.126.025301.

Ionic polaron in a Bose-Einstein condensate. Grigory E. Astrakharchik and LAP Ardila, Richard Schmidt, Krzysztof Jachymski & Antonio Negretti. Communications Physics (Springer Nature) 4, Article number: 94 (2021). https://doi.org/10.1038/s42005-021-00597-1.

Strong coupling Bose polarons in a two-dimensional gas. LAP Ardila, G. E. Astrakharchik, and S. Giorgini. Phys. Rev. Research 2, 023405 (2020). https://doi.org/10.1103/PhysRevResearch.2.023405

Analyzing the Bose polaron Across Resonant interactions. LAP Ardila, N. B. Jørgensen, T. Pohl, S. Giorgini, G. M. Bruun and J. J. Arlt. Phys. Rev. A 99. 063607 (2019). https://doi.org/10.1103/PhysRevA.99.063607.

Ground-state properties of the Dipolar Bose-Polaron. LAP Ardila and Thomas Pohl. J. Phys. B: At. Mol. Opt. Phys. 52 (2019). https://doi.org/10.1088/1361-6455/aaf35e.

Critical slowdown of non-equilibrium polaron dynamics. K Knakkergaard,LAP Ardila, G. M. Bruun and Thomas Pohl. New J. Phys, 21 043014 (2019). https://doi.org/10.1088/1367-2630/ab0a81.

Measuring the single-particle density matrix for fermions and hard-core bosons in an optical lattice. LAP Ardila, Markus Heyl, André Eckardt. Phys. Rev. Lett 121, 260401 (2018). https://doi.org/10.1103/PhysRevLett.121.260401.

Bipolarons in a Bose-Einstein Condensate. A. Camacho-Guardian, LAP Ardila, T. Pohl, and G. M. Bruun. Phys. Rev. Lett. 121, 013401 (2018). https://doi.org/10.1103/PhysRevLett.121.013401.

Bose Polaron Problem: effect of mass imbalance on binding energy. LAP Ardila, S. Giorgini. Phys. Rev. A. 94. 063640 (2016) https://doi.org/10.1103/PhysRevA.94.063640

Impurity in a Bose-Einstein condensate: study of the attractive and repulsive branch using quantum Monte-Carlo methods. LAP Ardila and S. Giorgini. Phys. Rev. A 92. 033612 (2015). https://doi.org/10.1103/PhysRevA.92.033612.

Elastic constants of hcp 4He: path integral Monte-Carlo results vs. experiment. LAP Ardila, Silvio A. Vitiello & Maurice de Koning. Phys. Rev. B 84, 094119 (2011). https://doi.org/10.1103/PhysRevB.84.094119

Last update: 04-26-2025 - 11:26

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