Browsing by Subject "charged-neutral mixture"

Now showing 1 - 3 of 3

Open Access
Dark current control in InAs/GaSb superlattice photodetectors
(2013) Muti, Abdullah
Bose-Einstein Condensation (BEC) was introduced by Einstein 1925. It took 70 years to confirm BEC by experiments. BEC creates a suitable environment to observe macroscopic-quantum behavior. Condensates consist of ultracold atoms allow physicists to create superfluids and also they allow to manipulate these quantum structures easily. One of the main tool needed to manipulate these structures is synthetic magnetic field. Under the light of these experimental achievements we studied the angular momentum transfer in the N-body systems. First of all, to develop physical intuition, we solved 2-body problem. This problem can be defined as: The system consist of two particles and confined in a ring. Particles interact with each other and charged one coupled to the magnetic field. We used two approaches to solve the system and compared these approaches in the small limit of inter-particle interaction. Finally, we studied N-body systems and vortex transfer in the two-component superfluid mixtures via Gross-Pitaevski equation and Bogoulibov equations. We observed that for various parameters neutral-neutral mixtures do not possess vortex transfer, yet charged-neutral mixtures coupled to the magnetic field experience vortex transfer.
Open Access
Pairing in charged-neutral fermion mixtures under an artificial magnetic field
(2012) Ünal, Fatma Nur
Bose-Einstein condensations (BEC), pairing behaviour, vortex formations in superconductivity and superfluidity are just a few examples of fascinating features of ultracold gases. In this thesis, we study charged-neutral cold atom mixtures which are obtained by placing a neutral mixture under an artificial magnetic field coupling only one of the components. We begin with two distinguishable (charged-neutral) particles on a ring trap. Charged particle gains angular momentum due to a magnetic field along the axis of the ring and we see that there is a big angular momentum transfer to neutral particle in orders of ¯h. This work is set forth to guide us in the many body problem of vortex transformation in charged-neutral superfluid mixtures. In the main part of the thesis, we examine charged-neutral fermion mixtures. Thanks to artificial magnetic fields, Cooper pairs whose only one component coupling to magnetic field can be created now. We calculate the gap equation for this system and solve for the critical temperature. We show that critical temperature decreases for the increasing magnetic field.
Open Access
Vortex transfer in charged-neutral superfluid mixtures
(2013) Kaya, Semih
Bose-Einstein Condensation (BEC) was introduced by Einstein 1925. It took 70 years to confirm BEC by experiments. BEC creates a suitable environment to observe macroscopic-quantum behavior. Condensates consist of ultracold atoms allow physicists to create superfluids and also they allow to manipulate these quantum structures easily. One of the main tool needed to manipulate these structures is synthetic magnetic field. Under the light of these experimental achievements we studied the angular momentum transfer in the N-body systems. First of all, to develop physical intuition, we solved 2-body problem. This problem can be defined as: The system consist of two particles and confined in a ring. Particles interact with each other and charged one coupled to the magnetic field. We used two approaches to solve the system and compared these approaches in the small limit of inter-particle interaction. Finally, we studied N-body systems and vortex transfer in the two-component superfluid mixtures via Gross-Pitaevski equation and Bogoulibov equations. We observed that for various parameters neutral-neutral mixtures do not possess vortex transfer, yet charged-neutral mixtures coupled to the magnetic field experience vortex transfer.