Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Quantum Gases: Bosons II
Q 22.7: Vortrag
Dienstag, 1. März 2016, 16:00–16:15, e001
Towards the Bose Polaron in an ultracold gas — •Lars J. Wacker, Nils B. Jørgensen, Kristoffer T. Skalmstang, Rasmus S. Christensen, Georg Bruun, and Jan Arlt — Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
An impurity interacting with its surroundings leads to the formation of a quasi particle, called a polaron. This was first described by Landau as a bosonic phonon gas, formed in a solid by the interaction of an electron with the lattice displacements. Ultracold gases with their high degree of control allowed for first experimental investigations of the Fermi polaron in ultracold Fermi gases.
Likewise, bosonic polarons can be investigated using mixtures of ultracold bosonic gases. I present our study of the Bose polaron, employing a magnetic Feshbach resonance to tune the interaction between two spin states of 39K. We record the energy spectrum of the impurity for different interaction strengths, allowing us to distinguish between the mean field energy regime and the appearance of the polaronic signature in the spectrum.