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dc.contributor.authorScazza, F
dc.contributor.authorValtolina, G
dc.contributor.authorMassignan, Pietro Alberto
dc.contributor.authorRecati, Alessio
dc.contributor.authorAmico, A
dc.contributor.authorBurchianti, A
dc.contributor.authorFort, C
dc.contributor.authorInguscio, M
dc.contributor.authorZaccanti, M
dc.contributor.authorRoati, G
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationScazza, F., Valtolina, G., Massignan, P., Recati, A., Amico, A., Burchianti, A., Fort, C., Inguscio, M., Zaccanti, M., Roati, G. Repulsive Fermi polarons in a resonant mixture of ultracold 6Li atoms. "Physical review letters", 2017, vol. 118.
dc.description.abstractWe employ radio-frequency spectroscopy to investigate a polarized spin mixture of ultracold 6 Li atoms close to a broad Feshbach scattering resonance. Focusing on the regime of strong repulsive interactions, we observe well-defined coherent quasiparticles even for unitarity-limited interactions. We characterize the many-body system by extracting the key properties of repulsive Fermi polarons: the energy E + , the effective mass m * , the residue Z , and the decay rate G . Above a critical interaction, E + is found to exceed the Fermi energy of the bath, while m * diverges and even turns negative, thereby indicating that the repulsive Fermi liquid state becomes energetically and thermodynamically unstable.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica
dc.subject.lcshQuantum theory
dc.subject.otherFermi gases
dc.subject.otherPhysical Systems
dc.subject.otherUltracold gases
dc.subject.otherresonance Spectroscopy
dc.subject.otherCondensed Matter & Materials PhysicsAtomic
dc.subject.otherMolecular & Optical
dc.titleRepulsive Fermi polarons in a resonant mixture of ultracold 6Li atoms
dc.subject.lemacQuàntums, Teoria dels
dc.contributor.groupUniversitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/H2020/637738/EU/Superfluidity and ferromagnetism of unequal mass fermions with two- and three-body resonant interactions/PoLiChroM
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/H2020/705269/EU/Strongly correlated ultracold fermions in two-dimensional tailored optical potentials: pairing, superfluidity and disorder/SCOUTFermi2D
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7/307032/EU/Quantum simulation of two-dimensional fermionic systems/QUFERM2D
local.citation.authorScazza, F.; Valtolina, G.; Massignan, P.; Recati, A.; Amico, A.; Burchianti, A.; Fort, C.; Inguscio, M.; Zaccanti, M.; Roati, G.
local.citation.publicationNamePhysical review letters

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