Seminar
Tuesday, 25 January, 2011
Group Seminar LMU: Probing the Equation of State of Strongly Correlated Quantum Gases
Tuesday, 25.01.2011 10 a.m. (s.t.) in H107, Fakultät für Physik LMU
Nir Navon, ENS Paris
In this talk we will present a recent experimental work performed at ENS on the thermodynamics of strongly correlated bulk quantum gases. We have developed a general method to probe with high precision the Equation of State (EoS) of homogeneous gases using trapped cold atoms. First, we will focus on strongly interacting fermionic 6Li, in two different spin states. The EoS has been measured in large sectors of the parameter space [1,2]. We will see how the normal phase is remarkably well described by Fermi liquid theory both versus spin excitations and thermal excitations [3].
Second, we will present recent work on bosonic 7Li with tunable interactions. We have measured the EoS of the Bose gas as a function of interaction at very low temperature [4]. For the first time in atomic Bose gases, we measured quantitatively the Lee-Huang-Yang beyond mean-field correction to the ground state energy. We have extended this study using out-of-equilibrium measurements of the Bose gas in the strongly interacting regime, which gives a first hint on properties of the hypothetical unitary Bose gas.
[1]S. Nascimbene, N. Navon, K. Jiang, F. Chevy, C. Salomon, Exploring the Thermodynamics of a Universal Fermi Gas, Nature 463, 1057 (2010).
[2] N. Navon, S. Nascimbene, F. Chevy, C. Salomon, The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions, Science 328, 729 (2010).
[3] S. Nascimbene, N. Navon, S. Pilati, F. Chevy, S. Giorgini, A. Georges, C. Salomon, A new Fermi liquid: the normal phase of a strongly interacting gas of cold atoms, cond-mat/arXiv:1012.4664 (2010)
[4] in preparation