Browsing by Keywords "Quantum theory"

Now showing items 21-40 of 54

    • Kuantum beden ve şiir 

      Kozalı, Şükran (1996)

    • Landau quantization of two-dimensional heavy holes, energy spectrum of magnetoexcitons and Auger-recombination lines 

      Podlesny I.V.; Moskalenko, S.A.; Hakioǧlu, T.; Kiselyov, A.A.; Gherciu L. (2013)
      The Landau quantization of the two-dimensional (2D) heavy holes, its influence on the energy spectrum of 2D magnetoexcitons, as well as their optical orientation are studied. The Hamiltonian of the heavy holes is written ...

    • Microcavity enhanced amorphous silicon photoluminescence 

      Serpengüzel, Ali; Aydınlı, Atilla; Bek, Alpan (IEEE, 1997)
      A microcavity enhancement of room temperature photoluminescence (PL) of a hydrogenated amorphous silicon (a-Si:h) was performed. A quantum confinement model was developed to describe the occurrence of the PL in the bulk ...

    • Near-UV InGaN/GaN-based dual-operation quantum optoelectronic devices 

      Özel, Tuncay; Sarı, Emra; Nizamoğlu, Sedat; Demir, Hilmi Volkan (SPIE, 2007)
      We present a novel dual-operation InGaN/GaN based quantum optoelectronic device (QOD) that operates as a quantum electroabsorption modulator in reverse bias and as a light emitter in forward bias in the spectral range of ...

    • Non-local, non-commutative picture in quantum mechanics and distinguished continuous canonical maps 

      Hakioglu, T. (IOP Science, 2002)
      It is shown that continuous classical nonlinear canonical (Poisson) maps have a distinguished role in quantum mechanics. They act unitarily on the quantum phase space and generate h-independent quantum nonlinear canonical ...

    • Non-Markovian dynamics in ultracold Rydberg aggregates 

      Genkin, M.; Schönleber, D. W.; Wüster, S.; Eisfeld, A. (Institute of Physics Publishing Ltd., 2016)
      We propose a setup of an open quantum system in which the environment can be tuned such that either Markovian or non-Markovian system dynamics can be achieved. The implementation uses ultracold Rydberg atoms, relying on ...

    • Nonadditivity of critical Casimir forces 

      Callegari, Agnese; Paladugu, Sathyanarayana; Tuna, Yazgan; Barth, Lukas; Dietrich, S.; Gambassi, A.; Volpe, Giovanni (OSA, 2017)
      We provide the first experimental evidence of nonadditivity for critical Casimir forces: the force that two colloidal particles exert together on a third one differs from the sum of the forces they exert separately.

    • Nonthermal Quantum Channels as a Thermodynamical Resource 

      Navascués, M.; García-Pintos L.P. (American Physical Society, 2015)
      Quantum thermodynamics can be understood as a resource theory, whereby thermal states are free and the only allowed operations are unitary transformations commuting with the total Hamiltonian of the system. Previous ...

    • 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 ...

    • The off-resonant aspects of decoherence and a critique of the two-level approximation 

      Savran, K.; Hakioǧlu T.; Mese, E.; Sevinçli, H. (IOP Institute of Physics, 2006)
      Conditions in favour of a realistic multilevelled description of a decohering quantum system are examined. In this regard the first crucial observation is that the thermal effects, contrary to the conventional belief, play ...

    • On the possibility of grafting conducting polymers into insulating ones 

      Bahçeci, S.; Toppare, L.; Yurtsever, E. (Elsevier, 1996)
      The possibility of grafting between conducting polymers, like polypyrrole (PPy) and polyaniline (PAn), and insulating polymers, such as polybisphenol A carbonate (PC) and polyamide (PA), is studied via semi-empirical methods ...

    • Persistent currents in mesoscopic loops and networks 

      Kulik, Igor O. (TÜBİTAK, 2003)
      The paper describes persistent (also termed "permanent", or "non-decaying") currents in mesoscopic metallic and macromolecular rings, cylinders and networks. The current arises as a response of system to Aharonov-Bohm flux ...

    • Persistent perfect entanglement in atomic systems 

      Çakır, Özgür; Can, M. Ali; Klyachko, Alexander A.; Shumovsky, Alexander S. (IOP, 2004)
      It is shown that the system of an even number of three-level atoms in the Λ configuration in a cavity can evolve into a persistent maximum entangled state. The time of formation of such an entangled state is estimated.

    • Photonic band gap via quantum coherence in vortex lattices of Bose-Einstein condensates 

      Müstecaplioǧlu, O. E.; Oktel, M. Ö. (The American Physical Society, 2005)
      We investigate the optical response of an atomic Bose-Einstein condensate with a vortex lattice. We find that it is possible for the vortex lattice to act as a photonic crystal and create photonic band gaps, by enhancing ...

    • Quantum canonical transformations in star-product formalism 

      Dereli, T.; Hakioğlu, Tuğrul; Temen, A. (IOP, 2013)
      We study construction of the star-product version of three basic quantum canonical transformations which are known as the generators of the full canonical algebra. By considering the fact that star-product of c-number ...

    • Quantum Dynamics of Long-Range Interacting Systems Using the Positive-P and Gauge-P Representations 

      Wüster, S.; Corney, J. F.; Rost, J. M.; Deuar, P. (American Physical Society, 2017)
      We provide the necessary framework for carrying out stochastic positive-P and gauge-P simulations of bosonic systems with long-range interactions. In these approaches, the quantum evolution is sampled by trajectories in ...

    • Quantum information processing in solid states: A critique of two-level approximation 

      Savran K.; Hakioğlu T. (World Scientific Publishing Co., 2005)
      We examine the effect of multilevels on decoherence and dephasing properties of a quantum system consisting of a non-ideal two level subspace, identified as the qubit and a finite set of higher energy levels above this ...

    • Quantum mechanical simulation of charge transport in very small semiconductor structures 

      Yalabik, M. C.; Diff, K. (IEEE, 1989)
      A quantum mechanical simulation method of charge transport in very small semiconductor devices, based on the numerical solution of the time-dependent Schrödinger equation (coupled self-consistently to the Poisson equation ...

    • Quantum stereographic projection and the homographic oscillator 

      Hakioǧlu T.; Arik, M. (American Physical Society, 1996)
      The quantum deformation created by the stenographic mapping from S2 to C is studied. It is shown that the resulting algebra is locally isomorphic to su(2) and is an unconventional deformation of which the undeformed limit ...

    • Quantum transport through one-dimensional aluminum wires 

      Batra, I. P.; Sen, P.; Çıracı, Salim (American Vacuum Society, 2002)
      Quantum conductance in narrow channels has been well understood by using the two-dimensional electron gas, a model system which has been realized in semiconductor heterojunctions. An essential property of this electron ...