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1.
Fransson, J.
Effects of non-orthogonality and electron correlations on the time-dependent current through quantum dots / J. . Fransson, O. . Eriksson, I. . Sandalov> // Phys. Rev. B. - 2002. -
Vol. 66
,
Is. 19
. - Ст. 195319,
DOI
10.1103/PhysRevB.66.195319. - Cited References: 46 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
GREENS-FUNCTION APPROACH
TUNNEL
-
JUNCTIONS
LOCAL OXIDATION
ANDERSON MODEL
TRANSPORT
NONORTHOGONALITY
CONDUCTANCE
EQUILIBRIUM
TRANSISTOR
IMPURITY
Аннотация:
Three issues are analyzed in the physics of time-dependent tunneling current through a quantum dot with strongly correlated electrons coupled to two external contact leads: (i) nonorthogonality of the states of electrons in the leads and in the quantum dot, (ii) non-Fermi statistics of the excitations in the quantum dot, and iii) kinematic shift of the quantum dot levels. The contributions from nonorthogonality effectively decrease the mixing interaction between the leads and the quantum dot and the width of the quantum dot level whereas the Gibbs statistics slightly changes the spectral weights of quantum dot levels, and decreases the widths, but does not introduce drastical changes to the current. The kinematic interactions are taken into account within the loop correction. For the case of block signal, the time-dependent current shows oscillations starting at the onset and termination of the bias voltage pulse.
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Держатели документа:
Univ Uppsala, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Eriksson, O.; Sandalov, I.
}
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2.
Fransson, J.
Many-body approach to spin-dependent transport in quantum dot systems / J. . Fransson, O. . Eriksson, I. . Sandalov> // Phys. Rev. Lett. - 2002. -
Vol. 88
,
Is. 22
. - Ст. 226601,
DOI
10.1103/PhysRevLett.88.226601. - Cited References: 37 . - ISSN 0031-9007
РУБ
Physics, Multidisciplinary
Рубрики:
SINGLE-ELECTRON TRANSISTOR
COULOMB-BLOCKADE
ANDERSON IMPURITY
ROOM-TEMPERATURE
TUNNEL
-
JUNCTIONS
EVEN NUMBER
MODEL
MAGNETORESISTANCE
OSCILLATIONS
CONDUCTANCE
Аннотация:
By means of a diagram technique for Hubbard operators, we show the existence of a spin-dependent renormalization of the localized levels in an interacting region, e.g., quantum dot, modeled by the Anderson Hamiltonian with two conduction bands. It is shown that the renormalization of the levels with a given spin direction is due to kinematic interactions with the conduction subbands of the opposite spin. The consequence of this dressing of the localized levels is a drastically decreased tunneling current for ferromagnetically ordered leads compared to that of paramagnetically ordered leads. Furthermore, the studied system shows a spin-dependent resonant tunneling behavior for ferromagnetically ordered leads.
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Держатели документа:
Univ Uppsala, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Eriksson, O.; Sandalov, I.
}
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3.
The magnetic-field-driven effect
of microwave detection in a manganite granular system / N. V. Volkov [et al.]> // J. Phys. D. - 2008. -
Vol. 41
,
Is. 1
. - Ст. 15004,
DOI
10.1088/0022-3727/41/1/015004. - Cited References: 24 . - ISSN 0022-3727
РУБ
Physics, Applied
Рубрики:
IDENTICAL METALS
TUNNEL
-
JUNCTIONS
MAGNETORESISTANCE
RECTIFICATION
SPINTRONICS
TEMPERATURE
PEROVSKITES
Кл.слова (ненормированные):
Bias currents
--
Curie temperature
--
Electric power generation
--
Granular materials
--
Magnetic field effects
--
Microwave irradiation
--
Voltage measurement
--
Direct current voltage
--
Magnetic
tunnel
junctions
--
Metal insulator metal
junctions
--
Nonmagnetic metals
--
Manganites
Аннотация:
We demonstrate the microwave detection effect in a granular La0.7Ca0.3MnO3 sample. Dc voltage generated by the sample in response to microwave irradiation below the Curie temperature is found to be dependent on the applied magnetic field. The magnetic field dependence of the dc voltage has a broad peak resembling an absorption line. The detection effect depends substantially on the magnetic history of the sample; however, identical measurement conditions provide reproducibility of the experimental results. The detected dc voltage increases linearly with microwave power and strongly depends on a bias current through the sample. According to the results of systematic measurements, there exist two contributions to a value of the detected output signal. The first is magneto-independent; it can be explained in the framework of a mechanism used traditionally for description of the rectification effect in metal-insulator-metal
junctions
with nonmagnetic metals. The other is magneto-dependent; it originates from the interplay between the spin-dependent current through magnetic
tunnel
junctions
and spin dynamics of the grains, which form these
junctions
in the sample.
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Держатели документа:
[Volkov, N. V.
Eremin, E. V.
Shaykhutdinov, K. A.
Tsikalov, V. S.
Petrov, M. I.
Balaev, D. A.
Semenov, S. V.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Volkov, N. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Tsikalov, V. S.; Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семенов, Сергей Васильевич
}
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