Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 95: Cold Atomic Gases, Superfluids, Quantum Fluids and Solids
TT 95.2: Talk
Thursday, March 15, 2018, 15:15–15:30, HFT-FT 131
Bose-Einstein condensation of a non-ideal Bose gas of atoms with large spin — •Andrei Pavlov1, Vladimir Babichenko2, and Ilya Polishchuk2,3 — 1IFW Dresden, Dresden, Germany — 2Kurchatov Institute, Moscow, Russia — 3MIPT, Dolgoprudnii, Russia
A non-ideal diluted quantum Bose gas of atoms with spin-spin interaction of dipole type is described in the spin coherent states representation. Large values of spin can be treated quasi-classically up to exponentially small corrections, that allows to derive effective interaction between particles of the gas. A preferable ground state configuration of the system is determined by this effective interaction, the spin-spin coupling constant regulates whether the system takes ferromagnetic or antiferromagnetic ground state. The coupling constants of long-ranged spin-spin interaction and short-ranged scattering also define a condition when the system collapses, causing formation of molecules.