CCQ Lunch Seminar
Speaker: Juan Sanchez-Baena: "Spin orbit coupling in quantum systems and dipole-dipole scattering"
Oplysninger om arrangementet
Tidspunkt
Sted
Via Zoom
Abstract:
We present a Quantum Monte Carlo approach to the computation of properties of the ground state of a many-body system featuring Spin Orbit Coupling (SOC). We brie y describe how the basic Diusion Monte Carlo (DMC) method must be modied in order to describe SOC systems. For the specic case of Raman SOC, which is of experimental relevance, we show that the increase of inter-atomic correlations signicantly modies the phase diagram of the system with respect to mean eld calculations. Specically, the region of a stripe phase with super uid properties is enhanced. Within the framework of the Bogoliubov-de Gennes theory, we study the role of quantum uctuations in the stabilization of a Raman SOC stripe system which is unstable at the mean eld level due to the presence of attractive inter-spin interactions. We report that quantum uctuations indeed stabilize the system, leading to either a gas or a liquid as a function of the parameters of the Hamiltonian. We also show that the nite, stabilized system admits droplet-like solutions which feature internal structure, thus mixing solid-like and liquid-like properties. Finally, we brie y comment on dipole-dipole scattering without SOC, and show two examples where the computation of the s-wave scattering length is relevant to link theoretical and experimental results.