S. Sakiroglu

Publications (3)3.72 Total impact

• Article: Voltage Tunable Dual-Band Quantum-Well Infrared Photodetector for Third-Generation Thermal Imaging

  M. Hostut, A. Kilic, S. Sakiroglu, Y. Ergun, I. Sokmen
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  ABSTRACT: We investigate the theoretical calculations of the voltage tunable dual-band quantum-well infrared photodetector (QWIP) in the long and very long wavelength infrared range (LWIR and VLWIR). The detector consists of two serially connected GaAs/AlGaAs stacks which have spectral responses of 8.4- and 14- μm wavelengths, respectively. The peak responsivity wavelength of the stacks shifts from 8.4 to 14 μm as the bias voltage is increased.
  IEEE Photonics Technology Letters 11/2011; · 2.19 Impact Factor
• Source

  Available from: A. Siddiki

  Article: Microscopic theory of the activated behavior of the quantized Hall effect

  S. Sakiroglu, U. Erkarslan, G. Oylumluoglu, A. Siddiki, I. Sokmen
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  ABSTRACT: The thermally activated behavior of the gate defined narrow Hall bars is studied by analyzing the existence of the incompressible strips within a Hartree-type approximation. We perform self-consistent calculations considering the linear response regime, supported by a local conductivity model. We investigate the variation of the activation energy depending on the width of samples in the range of $2d\sim [1-10] \mu m$. We show that the largest activation energy of high-mobility narrow samples, is at the low field edge of Hall filling factor 2 plateau (exceeding half of the cyclotron energy), whereas for relatively wide samples the higher activation energy is obtained at the high field edge of Hall plateau. In contrast to the single-particle theories based on the localization of electronic states, we found that the activation energy is almost independent of the properties of the density of states. Comment: 8 pages, 4 figures
  06/2009;
• Article: The effects of the magnetic field and dielectric screening on the diamagnetic susceptibility of a donor in a quantum well with anisotropic effective mass

  E. Kilicarslan, S. Sakiroglu, M. Koksal, H. Sari, I. Sokmen
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  ABSTRACT: The diamagnetic susceptibility and the binding energy of a hydrogenic donor in a quantum well with different mass anisotropy parameters γ=m⊥/m|| are investigated in the presence of a magnetic field using a trial wave function with two parameters in the framework of the effective mass approximation. It is observed that the effects of magnetic field on diamagnetic susceptibility of the donor in two-dimensional semiconductors with various effective mass anisotropy parameters are quite different. Also it has been found that for Si there is an obvious increase in the binding energy for spatially dependent screening compared with that for constant screening in the range of considered well widths, whereas the spatially dependent screening effect is small for Ge and GaAs materials.
  Physica E Low-dimensional Systems and Nanostructures 42(5):1531-1535. · 1.53 Impact Factor