Yazar "Siddiki, Afif" için listeleme
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The current polarization rectification of the integer quantized Hall effect
Eksi, D.; Kilicoglu, O.; Aktas, S.; Siddiki, Afif (Elsevier Science Bv, 2010)We report on our theoretical investigation considering the widths of quantized Hall plateaus (QHPs) depending on the density asymmetry induced by the large current within the out-of-linear response regime. We solve the ... -
Current-direction-induced rectification effect on (integer) quantized Hall plateaus
Siddiki, Afif (Edp Sciences S A, 2009)Current distribution across narrow Hall bars in out of linear response regime is studied within a self-consistent Hartree-type mean-field approximation for samples which are equally and unequally depleted laterally. The ... -
The effect of disorder on integer quantized Hall effect
Gülebağlan, S. Erden; Oylumluoğlu, G.; Erkaslan, U.; Siddiki, Afif; Sökmen, I. (Elsevier, 2012)We study the effects of disorder on the integer quantized Hall effect within the screening theory, systematically. The disorder potential is analyzed considering the range of the potential fluctuations. The short-range ... -
Electrostatic screening and experimental evidence of a topological phase transition in a bulk quantum Hall liquid
Mares, Jiri J.; Siddiki, Afif; Kindl, Dobroslav; Hubik, Pavel; Kristofik, Jozef (Iop Publishing Ltd, 2009)The electrostatic screening of a medium disordered quantum Hall liquid was investigated using an electric field penetration (EFP) technique. At sufficiently low temperatures and at magnetic fields corresponding to the ... -
Interaction-mediated asymmetries of the quantized Hall effect
Siddiki, Afif; Horas, J.; Moser, J.; Wegscheider, W.; Ludwig, S. (Epl Association, European Physical Society, 2009)Experimental and theoretical investigations on the integer quantized Hall effect in gate-defined narrow Hall bars are presented. At low electron mobility the classical (high-temperature) Hall resistance line R(H)(B) cuts ... -
Microscopic theory of the activated behavior of the quantized Hall effect
Şakiroğlu, S.; Erkarslan, Uğur; Oylumluoğlu, Görkem; Siddiki, Afif; Sökmen, I. (Elsevier Science Bv, 2010)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 ... -
Quantum Hall effect in a high-mobility two-dimensional electron gas on the surface of a cylinder
Friedland, K. -J.; Siddiki, Afif; Hey, R.; Kostial, H.; Riedel, A.; Maude, D. K. (Amer Physical Soc, 2009)The quantum Hall effect is investigated in a high-mobility two-dimensional electron gas on the surface of a cylinder. This special topology leads to a spatially varying filling factor along the current path. The resulting ... -
Screening theory based modeling of the quantum Hall based quasi-particle interferometers, defined at quantum dots
Salman, A.; Koymen, E.; Yucel, M. B.; Atci, H.; Erkarslan, Uğur; Siddiki, Afif (Elsevier Science Bv, 2012)In this work, we investigate the spatial distributions and the widths of the incompressible strips, i.e. the edge-states. The incompressible strips that correspond to nu = 1,2 and 1/3 filling factors are examined in the ... -
The self-consistent calculation of exchange enhanced odd integer quantized Hall plateaus within Thomas-Fermi-Dirac approximation
Bilgec, G.; Toffoli, H. Uestuenel; Siddiki, Afif; Sokmen, I. (Elsevier Science Bv, 2010)We study the emergent role of many-body effects on a two-dimensional electron gas (2DEG) within the Thomas-Fermi-Dirac-Poisson approximation, including both the exchange and correlation interactions in the presence of a ... -
Spatial distribution of the incompressible strips at AB interferometer
Cicek, E.; Mese, A. I.; Ulas, M.; Siddiki, Afif (Elsevier Science Bv, 2010)In this work, the edge physics of an Aharonov-Bohm interferometer (ABI) defined on a two dimensional electron gas, subject to strong perpendicular magnetic field B, is investigated. We solve the three dimensional Poisson ... -
Stability of spin droplets in realistic quantum Hall devices
Atci, H.; Erkarslan, Uğur; Siddiki, Afif; Rasanen, E. (Iop Publishing Ltd, 2013)We study the formation and characteristics of 'spin droplets', i.e. compact spin-polarized configurations in the highest occupied Landau level, in an etched quantum Hall device at filling factors 2 <= nu <= 3. The confining ... -
Temperature dependent symmetry to asymmetry transition in wide quantum wells
Oylumluoğlu, Görkem; Mirioğlu, S.; Aksu, S.; Erkaslan, Uğur; Siddiki, Afif (Elsevier, 2015)Quasi-two dimensional electron systems exhibit peculiar transport effects depending on their density profiles and temperature. A usual two dimensional electron system is assumed to have a 6 like density distribution along ... -
The visibility of IQHE at sharp edges: experimental proposals based on interactions and edge electrostatics
Erkarslan, Uğur; Oylumluoğlu, Görkem; Grayson, M.; Siddiki, Afif (Iop Publishing Ltd, 2012)The influence of the incompressible strips on the integer quantized Hall effect (IQHE) is investigated, considering a cleaved-edge overgrown (CEO) sample as an experimentally realizable sharp edge system. We propose a set ...
