Dr. Banerjee erforscht Quantengaugetheorie auf dem Gitter, insbesondere wie Quantensimulatoren komplexe Vielteilchensysteme mit Eichsymmetrien abbilden können. Seine aktuelle Arbeit konzentriert sich auf Phasenübergänge in Quantenlink-Modellen, das Verhalten von Fermionen unter Eichfeldern und die Vermeidung des Fermion-Vorzeichenproblems — ein zentrales Hindernis bei numerischen Simulationen. Die Ergebnisse sind relevant für die Grundlagenforschung in Quantenfeld- und Festkörpertheorie sowie für die Entwicklung von Quantenalgorithmen zur Simulation von Quantenchromodynamik und verwandten Systemen.
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Dr. Debasish Banerjee
HU-FIS-Profil ↗Förderer: DFG Eigene Stelle (Sachbeihilfe) Zeitraum: 08/2018 - 11/2020 Projektleitung: Dr. Debasish Banerjee, Prof. Dr. Agostino Patella
Physical Review Letters · DOI
Using a Fermi-Bose mixture of ultracold atoms in an optical lattice, we construct a quantum simulator for a U(1) gauge theory coupled to fermionic matter. The construction is based on quantum links which realize continuous gauge symmetry with discrete quantum variables. At low energies, quantum link models with staggered fermions emerge from a Hubbard-type model which can be quantum simulated. This allows us to investigate string breaking as well as the real-time evolution after a quench in gauge theories, which are inaccessible to classical simulation methods.
Physical Review Letters · DOI
Using ultracold alkaline-earth atoms in optical lattices, we construct a quantum simulator for U(N) and SU(N) lattice gauge theories with fermionic matter based on quantum link models. These systems share qualitative features with QCD, including chiral symmetry breaking and restoration at nonzero temperature or baryon density. Unlike classical simulations, a quantum simulator does not suffer from sign problems and can address the corresponding chiral dynamics in real time.
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · DOI
The momentum diffusion coefficient for heavy quarks is studied in a deconfined gluon plasma in the static approximation by investigating a correlation function of the color electric field using Monte Carlo techniques. The diffusion coefficient is extracted from the long-distance behavior of such a correlator. For temperatures ${T}_{c}<T\ensuremath{\lesssim}2{T}_{c}$, our nonperturbative estimate of the diffusion coefficient is found to be very different from the leading-order perturbation theory and is in the right ballpark to explain the heavy quark flow seen by the PHENIX Collaboration at the RHIC experiment.