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Wigner function description of ac transport through a two-dimensional quantum point contact / I. E. Aronov [et al.]> // J. Phys.: Condens. Matter. - 1997. - Vol. 9, Is. 24. - P. 5089-5103, DOI 10.1088/0953-8984/9/24/009. - Cited References: 45
. - ISSN 0953-8984РУБ Physics, Condensed Matter Рубрики: QUANTIZED CONDUCTANCE BALLISTIC-RESISTANCE CONSTRICTION CAPACITANCE ADMITTANCE ELECTRONS SYSTEMS FIELD PUMP Аннотация: We have calculated the admittance of a two-dimensional quantum point contact (QPC) using a novel variant of the Wigner distribution function (WDF) formalism. In the semiclassical approximation, a Boltzmann-like equation is derived for the partial WDF describing both propagating and non-propagating electron modes in an effective potential generated by the adiabatic QPC. We show that this quantum kinetic approach leads to the well known stepwise behaviour of the real part of the admittance (the conductance), and of the imaginary part of the admittance (the emittance), in agreement with the latest results derived by Christen and Buttiker, which is determined by the number of propagating electron modes. It is shown that the emittance is sensitive to the geometry of the QPC, and can be controlled by the gate voltage. We have established that the emittance has contributions corresponding to both quantum inductance and quantum capacitance. Stepwise oscillations in the quantum inductance are determined by the harmonic mean of the velocities for the propagating modes, whereas the quantum capacitance is a significant mesoscopic manifestation of the nonpropagating (reflecting) modes.
WOS, Scopus Держатели документа: LOS ALAMOS NATL LAB,CNLS,LOS ALAMOS,NM 87545 UKRAINIAN ACAD SCI,INST RADIOPHYS & ELECT,UA-310085 KHARKOV,UKRAINE LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801 ИФ СО РАН Theoretical Division, CNLS, Los Alamos National Laboratory, Los Alamos, NM 87545, United States Inst. Radiophysics and Electronics, Natl. Academy of Sciences of Ukraine, 12 Acad Proskura Street, 310085, Kharkov, Ukraine Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation Department of Physics, Univ. Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-3080, United States Доп.точки доступа: Aronov, I. E.; Berman, G. P.; Campbell, D. K.; Dudiy, S. V. } Найти похожие
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