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1.
Sadreev, A. F.
Electron transmission through an ac biased quantum point contact / A. F. Sadreev, K. . Davlet-Kildeev> // Phys. Rev. B. - 2007. -
Vol. 75
,
Is. 23
. - Ст. 235309,
DOI
10.1103/PhysRevB.75.235309. - Cited References: 41 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
MULTIPROBE CONDUCTORS
BALLISTIC TRANSPORT
WIRES
GAS
CONSTRICTION
SCATTERING
TIME
QUANTIZATION
OSCILLATIONS
RESISTANCE
Аннотация:
We consider a transmission through the potential relief created by a split gate
constriction
(quantum point contact). Simultaneously, dc and ac voltages V-up(t)=V-0+V-1 cos omega t and V-dw(t)=V-0+V-1 cos(omega t+theta) are applied to the gates. We show numerically that the in-phase ac voltages (theta=0) smear the conductance steps of the stationary conductance, while the antiphase ac voltages (theta=pi) only shift the conductance steps. Moreover, computation of currents in probing wires connected cross to the time-periodic quantum point contact reveals a net current for theta not equal 0,pi. This implies that the Schrodinger equation described by the electron transport under the effect of the time-periodic long electrodes is equivalent to the transmission in the crossed effective magnetic and electric fields, where the in-plane magnetic field b similar to theta is directed along the transport axis and the electric field e similar to omega is directed perpendicular to the plane of electron transport. Then the vector exb gives rise to the galvanomagnetic current directed cross to the electron transport.
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Держатели документа:
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
ИФ СО РАН
Institute of Physics, Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Department of Physics and Measurement Technology, Linkoping University, S-581 83 Linkoping, Sweden
Доп.точки доступа:
Davlet-Kildeev, K.; Садреев, Алмаз Фаттахович
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2.
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 0953-8984
РУБ
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.
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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.
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