Now showing items 1-13 of 13

    • Band Structure and Optical Properties of Kesterite Type Compounds: First principle calculations 

      Palaz S.; Unver H.; Ugur G.; Mamedov A.M.; Ozbay, E. (Institute of Physics Publishing, 2017)
      In present work, our research is mainly focused on the electronic structures, optical and magnetic properties of Cu2FeSnZ4 (Z = S, Se) compounds by using ab initio calculations within the generalized gradient approximation ...
    • Cat-state generation and stabilization for a nuclear spin through electric quadrupole interaction 

      Bulutay C. (American Physical Society, 2017)
      Spin cat states are superpositions of two or more coherent spin states (CSSs) that are distinctly separated over the Bloch sphere. Additionally, the nuclei with angular momenta greater than 1/2 possess a quadrupolar charge ...
    • A controllable spin prism 

      Hakiolu, T. (IOP Institute of Physics Publishing, 2009)
      Based on Khodas et al (2004 Phys. Rev. Lett. 92 086602), we propose a device acting like a controllable prism for an incident spin. The device is a large quantum well where Rashba and Dresselhaus spin-orbit interactions ...
    • Electronic structure of half-metallic ferromagnet Co2MnSi at high-pressure 

      Gökoǧlu, G.; Gülseren, O. (Springer New York LLC, 2010)
      In this study, first principles calculation results of the half-metallic ferromagnetic Heusler compound Co2MnSi are presented. All calculations are based on the spin-polarized generalized gradient approximation (σ-GGA) of ...
    • Excitonic condensation under spin-orbit coupling and BEC-BCS crossover 

      Hakioǧlu T.; Şahin, M. (The American Physical Society, 2007)
      The condensation of electron-hole pairs is studied at zero temperature and in the presence of a weak spin-orbit coupling (SOC) in coupled quantum wells. Under realistic conditions, a perturbative SOC can have observable ...
    • Magnetization of graphane by dehydrogenation 

      Şahin, H.; Ataca, C.; Ciraci, S. (AIP Publishing, 2009)
      Using first principles calculations, we show that each hydrogen vacancy created at graphane surface results in a local unpaired spin. For domains of hydrogen vacancies the situation is, however, complex and depends on the ...
    • Nuclear spin squeezing via electric quadrupole interaction 

      Korkmaz, Y. A.; Bulutay, C. (American Physical Society, 2016)
      Control over nuclear-spin fluctuations is essential for processes that rely on preserving the quantum state of an embedded system. For this purpose, squeezing is a viable alternative, so far that has not been properly ...
    • Quantum correlations of spin-1 atoms in an optical lattice 

      Öztop, B.; Oktel, M. Ö.; Müstecaplioǧlu, Ö. E. (Institute of Physics Publishing, 2009)
      In this work, we investigate the system of cold spin-1 atoms in a one dimensional optical lattice in relation with squeezing and entanglement. By using the corresponding Bose-Hubbard Hamiltonian, both superfluid and ...
    • Quantum entanglement of spin-1 bosons with coupled ground states in optical lattices 

      Öztop, B.; Oktel, M. Ö.; Müstecapliolu, Ö. E.; You, L. (IOP Institute of Physics Publishing, 2009)
      We examine particle entanglement, characterized by pseudo-spin squeezing, of spin-1 bosonic atoms with coupled ground states in a one-dimensional optical lattice. Both the superfluid and Mott-insulator phases are investigated ...
    • Simple test for hidden variables in spin-1 systems 

      Klyachko, A. A.; Can, M. A.; Binicioǧlu, S.; Shumovsky, A. S. (2008)
      We resolve an old problem about the existence of hidden parameters in a three-dimensional quantum system by constructing an appropriate Bell's type inequality. This reveals the nonclassical nature of most spin-1 states. ...
    • Spin filtering in a quantum ring with Rashba coupling 

      Tanatar, B.; Moldoveanu V. (2010)
      We study the effect of Rashba spin-orbit coupling on the spin interference in a non-interacting one-dimensional ring connected to two lead theoretically within the non-equilibrium Greens' function formalism. We compute the ...
    • Theory of the Pseudospin resonance in semiconductor bilayers 

      Abedinpour, S. H.; Polini, M.; MacDonald, A. H.; Tanatar, B.; Tosi, M. P.; Vignale, G. (The American Physical Society, 2007)
      The pseudospin degree of freedom in a semiconductor bilayer gives rise to a collective mode analogous to the ferromagnetic-resonance mode of a ferromagnet. We present a many-body theory of the dependence of the energy and ...
    • Unconventional pairing in excitonic condensates under Spin-orbit coupling 

      Can, M. A.; Hakioǧlu T. (The American Physical Society, 2009)
      It is shown that Rashba and Dresselhaus spin-orbit couplings enhance the conclusive power in the experiments on the excitonic condensate by at least three low temperature effects. First, spin-orbit coupling facilitates the ...