Ultracold atomic Fermi gases

Giacomo Roati & Francesco Scazza

Mo, 22 Feb 2016, at 10:00. Aula Querzoli

PDFs of the presentations Roati and Scazza

Ultracold atoms emerged as ideal quantum simulators of many-body phenomena, becoming a versatile test bed of quantum Hamiltonians. In particular, the production of ultracold fermionic systems has opened up a new way of studying condensed matter problems with higher controllability and unprecedented clarity.

In the first part of this lecture, we will introduce the main aspects of the physics of degenerate Fermi gases starting from the basic concepts related to the Fermi statistics [1]. We will describe the intriguing mechanism of Cooper pairing that gives rise to superfluidity in these systems, in close analogy to what happens in ordinary superconductors. This will give me the possibility of describing in some details the phenomenology of the BEC-BCS crossover in cold atomic systems [2].

In the second part of the lecture, we will explore the physics of ultracold atoms in optical lattices [3], which act as quantum simulators of solid-state materials with crystalline structure. We will give a particular emphasis to the Fermi-Hubbard Hamiltonian and its intriguing quantum phases, discussing some of the most fundamental experimental achievements in this direction.

[1] D. Jin, "A Fermi gas of atoms", Physics world 27-31 (2002)

[2] B. Goss Levi, "Images of vortices reveal superfluidity in a Fermi gas", Physics Today 58, 25-27, (2005)

[3] M. Greiner and S. Folling, "Optical lattices", Nature 453, 737-738 (2008)