Researcher:
Doko, Enis

Profile Picture
ORCID

Job Title

PhD Student

First Name

Enis

Last Name

Doko

Name

Name Variants

Doko, Enis

Email Address

Birth Date

Filters

2012 - 20173

Advanced Search

Filter by

Settings

Researcher Of Publications: search.filters.isAuthorOfPublication.0d5d7710-a15f-4e3b-8065-318ae0058dd6

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    PublicationOpen Access
    Counterflow of spontaneous mass currents in trapped spin-orbit-coupled Fermi gases
    (American Physical Society (APS), 2012) Subaşı, Ahmet Levent; Department of Physics; Işkın, Menderes; Doko, Enis; Faculty Member; Department of Physics; College of Sciences; 29659; N/A
    We use the Bogoliubov-de Gennes formalism and study the ground-state phases of trapped spin-orbit-coupled Fermi gases in two dimensions. Our main finding is that the presence of a symmetric (Rashba-type) spin-orbit coupling spontaneously induces counterflowing mass currents in the vicinity of the trap edge, i.e., up arrow and down arrow particles circulate in opposite directions with equal speed. These currents flow even in noninteracting systems, but their strength decreases toward the molecular Bose-Einstein-condensate limit, which can be achieved by increasing either the spin-orbit coupling or the interaction strength. These currents are also quite robust against the effects of asymmetric spin-orbit couplings in the x and y directions, gradually reducing to zero as the spin-orbit coupling becomes one dimensional. We compare our results with those of chiral p-wave superfluids and superconductors.
  • Thumbnail Image
    PublicationOpen Access
    Interplay between Rashba spin-orbit coupling and adiabatic rotation in a two-dimensional Fermi gas
    (American Physical Society (APS), 2017) Subaşı, Ahmet Levent; Department of Physics; Işkın, Menderes; Doko, Enis; Faculty Member; Department of Physics; College of Sciences; 29659; N/A
    We explore the trap profiles of a two-dimensional atomic Fermi gas in the presence of a Rashba spin-orbit coupling and under an adiabatic rotation. We first consider a noninteracting gas and show that the competition between the effects of Rashba coupling on the local density of single-particle states and the Coriolis effects caused by rotation gives rise to a characteristic ring-shaped density profile that survives at experimentally accessible temperatures. Furthermore, Rashba splitting of the Landau levels gives the density profiles a ziggurat shape in the rapid-rotation limit. We then consider an interacting gas under the BCS mean-field approximation for local pairing, and study the pair-breaking mechanism that is induced by the Coriolis effects on superfluidity, where we calculate the critical rotation frequencies both for the onset of pair breaking and for the complete destruction of superfluidity in the system. In particular, by comparing the results of a fully-quantum-mechanical Bogoliubov-de Gennes approach with those of a semiclassical local-density approximation, we construct extensive phase diagrams for a wide range of parameter regimes in the trap where the aforementioned competition may, e.g., favor an outer normal edge that is completely phase separated from the central superfluid core by vacuum.
  • Thumbnail Image
    PublicationOpen Access
    Rotating a Rashba-coupled Fermi gas in two dimensions
    (American Physical Society (APS), 2016) Subaşı, A. L.; Department of Physics; Işkın, Menderes; Doko, Enis; Faculty Member; Department of Physics; College of Sciences; 29659; N/A