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1.
Fransson, J.
A perfect spin-filter quantum dot system / J. . Fransson, I. . Sandalov, O. . Eriksson> // J. Phys.: Condens. Matter. - 2004. -
Vol. 16
,
Is. 16
. - P. L249-L254,
DOI
10.1088/0953-8984/16/16/L03. - Cited References: 39 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
NARROW ENERGY BANDS
ELECTRON CORRELATIONS
MAGNETIC-FIELD
MAGNETOTRANSPORT
CONDUCTANCE
RESISTANCE
BARRIER
FORMULA
VALVE
LIMIT
Кл.слова (ненормированные):
Electric potential
--
Electron tunneling
--
Magnetic couplings
--
Magnetic fields
--
Magnetic filters
--
Transport properties
--
Electron correlations
--
Magnetic contacts
--
Source-drain voltage
--
Spin projections
--
Semiconductor quantum dots
Аннотация:
The discovery of a novel effect in the transport through a QD spin-dependently coupled to magnetic contacts is reported. For a finite range of source-drain voltages the spin projections of the current cancel exactly, resulting in a completely suppressed output current. The spin down current behaves as one normally expects whereas the spin up current becomes negative. As the source-drain voltage is increased the spin up current eventually becomes positive. Thus, tuning the source-drain voltage such that the spin up current vanishes will result in a perfect spin filter.
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Держатели документа:
Royal Inst Technol, Dept Phys, KTH, SE-10691 Stockholm, Sweden
Univ Uppsala, Dept Phys, SE-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Max Planck Inst Phys Complex Syst, D-01187 Dresden, Germany
ИФ СО РАН
Department of Physics, Royal Institute of Technology (KTH), SE-106 91 Stockholm, Sweden
Physics Department, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden
Kirensky Institute of Physics, RAS, 660036 Krasnoyarsk, Russian Federation
Max-Plank-Inst. Phys. Complex Sys., Nothnitzer Stra?e 38, 01187 Dresden, Germany
Dept. of Mat. Sci. and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Доп.точки доступа:
Sandalov, I.; Eriksson, O.
}
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2.
Berggren, K. F.
Crossover from regular to irregular behavior in current flow through open billiards / K. F. Berggren, A. F. Sadreev, A. A. Starikov> // Phys. Rev. E. - 2002. -
Vol. 66
,
Is. 1
. - Ст. 16218,
DOI
10.1103/PhysRevE.66.016218. - Cited References: 36 . - ISSN 1539-3755
РУБ
Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
PHASE SINGULARITIES
NODAL POINTS
WAVE-FIELDS
QUANTUM
STREAMLINES
CONDUCTANCE
VORTICES
CHAOS
Кл.слова (ненормированные):
Eigenvalues and eigenfunctions
--
Mathematical models
--
Networks (circuits)
--
Random processes
--
Resonance
--
Signal processing
--
Spurious signal noise
--
Bursting time series
--
Coherence resonance
--
Power spectrum
--
Stochastic resonance
--
Chaos theory
Аннотация:
We discuss signatures of quantum chaos in terms of distributions of nodal points, saddle points, and streamlines for coherent electron transport through two-dimensional billiards, which are either nominally integrable or chaotic. As typical examples of the two cases we select rectangular and Sinai billiards. We have numerically evaluted distribution functions for nearest distances between nodal points and found that there is a generic form for open chaotic billiards through which a net current is passed. We have also evaluated the distribution functions for nodal points with specific vorticity (winding number) as well as for saddle points. The distributions may be used as signatures of quantum chaos in open systems. All distributions are well reproduced using random complex linear combinations of nearly monochromatic states in nominally closed billiards. In the case of rectangular billiards with simple sharp-cornered leads the distributions have characteristic features related to order among the nodal points. A flaring or rounding of the contact regions may, however, induce a crossover to nodal point distributions and current flow typical for quantum chaos. For an irregular arrangement of nodal points, as for example in the Sinai billiard, the quantum flow lines become very complex and volatile, recalling chaos among classical trajectories. Similarities with percolation are pointed out.
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Держатели документа:
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Dept. of Phys. and Msrmt. Technology, Linkoping University, S-581 83 Linkoping, Sweden
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Starikov, A. A.
}
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3.
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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4.
Hall-like effect induced
by spin-orbit interaction / E. N. Bulgakov [et al.]> // Phys. Rev. Lett. - 1999. -
Vol. 83
,
Is. 2
. - P. 376-379,
DOI
10.1103/PhysRevLett.83.376. - Cited References: 17 . - ISSN 0031-9007
РУБ
Physics, Multidisciplinary
Рубрики:
BERRYS PHASE
CONDUCTANCE
SCATTERING
SPECTRUM
RINGS
Аннотация:
We study the effect of spin-orbit interaction on the electron-transport properties of a cross-junction structure. It results in spin polarization of left and right outgoing electron waves. Consequently, the incoming electron wave of a certain polarization induces a voltage drop perpendicular to the direct current flow between the source and drain of the four-terminal cross structure investigated. The resulting Hall-like resistance is estimated to be of the order of 10(-3)-10(-2)h/e(2) for technologically feasible structures. The effect becomes more pronounced in the vicinity of resonances when the Hall-like resistance changes its sign as a function of the Fermi energy.
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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Abo Akad Univ, Inst Fys, Dept Phys, SF-20500 Turku, Finland
Acad Sci Czech Republ, Inst Phys, Prague 16253, Czech Republic
ИФ СО РАН
Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Streda, P.; Seba, P.
}
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5.
Pichugin, K. N.
Irregular Aharonov-Bohm oscillations in finite width rings / K. N. Pichugin, A. F. Sadreev> // Zhurnal Eksperimentalnoi Teor. Fiz. - 1996. -
Vol. 109
,
Is. 2
. - P. 546-561. - Cited References: 47 . - ISSN 0044-4510
РУБ
Physics, Multidisciplinary
Рубрики:
HALF FLUX QUANTA
EDGE STATES
MAGNETIC-FIELD
CIRCULAR BENDS
WIRES
TRANSPORT
MAGNETOTRANSPORT
RESISTANCE
FLUCTUATIONS
CONDUCTANCE
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Доп.точки доступа:
Sadreev, A. F.
}
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6.
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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7.
Kolovsky, A. R.
Master equation approach to conductivity of bosonic and fermionic carriers in one- and two-dimensional lattices / A. R. Kolovsky> // Ann. Phys.-Berlin. - 2014. -
Vol. 526
,
Is. 1/2
. - P. 102-111,
DOI
10.1002/andp.201300169. - Cited References: 24. - The author express his gratitude to D.N. Maksimov for useful remarks and acknowledge financial support of Russian Academy of Sciences through the SB RAS integration Project No. 29 (Dynamics of atomic Bose-Einstein condensates in optical lattices). . - ISSN 0003-3804. - ISSN 1521-3889
Перевод заглавия:
Проводимость с бозе и ферми носителями в в одномерных и двумерных решетках: подход уравнения для матрицу плотности
РУБ
Physics, Multidisciplinary
Рубрики:
CONDUCTANCE
Кл.слова (ненормированные):
diffusive current
--
the Hall effect
Аннотация:
The master equation approach to diffusive current of bosonic or fermionic carriers in one- and two-dimensional lattices is discussed. This approach is shown to reproduce all known results of the linear response theory, including the integer quantum Hall effect for fermionic carriers. The main advantage of the approach is that it allows to calculate the current beyond the linear response regime where new effects are found. In particular, the Hall current can be inverted by changing orientation of the static force (electric field) relative to the primary axes of the lattice.
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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Доп.точки доступа:
Коловский, Андрей Радиевич; Russian Academy of Sciences through the SB RAS integration Project [29]
}
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8.
Bulgakov, E. N.
Mixing of bound states with electron transport by a radiation field in waveguides / E. N. Bulgakov, A. F. Sadreev> // J. Exp. Theor. Phys. - 1998. -
Vol. 87
,
Is. 6
. - P. 1058-1067,
DOI
10.1134/1.558621. - Cited References: 27 . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
CLASSICALLY UNBOUND SYSTEM
HALL RESISTANCE ANOMALIES
QUANTUM WAVE-GUIDES
POINT CONTACTS
WIRES
TIME
CONDUCTANCE
Аннотация:
Electron transmission in the two-, three-, and four-terminal nanostructures is considered under the influence of a radiation field. The frequency of the radiation field is tuned to the transition between the energy of a bound state and the Fermi energy of the incident electrons. The radiation induced resonant peaks and dips of the electron transport are exhibited for zero and low magnetic fields. It is shown that rotation of the radiation field polarization can effectively control the electron transport into different electrodes attached to the structures because of the symmetry of the structures. The resonant anomalies of the Hall resistance are found in a weak magnetic field. (C) 1998 American Institute of Physics. [S1063-7761(98)00412-0].
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Abo Akad Univ, Inst Fys, Dept Phys, SF-20500 Abo, Finland
ИФ СО РАН
Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
}
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9.
Starikov, A. A.
Scenario for the 0.7-
conductance
anomaly in quantum point contacts / A. A. Starikov, I. I. Yakimenko, K. F. Berggren> // Phys. Rev. B. - 2003. -
Vol. 67
,
Is. 23
. - Ст. 235319,
DOI
10.1103/PhysRevB.67.235319. - Cited References: 23 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
2-DIMENSIONAL ELECTRON-GAS
SPIN POLARIZATION
CONDUCTANCE
WIRES
STATE
Аннотация:
Effects of spontaneous spin polarization in quantum point contacts (QPC's) are investigated for a realistic semiconductor device structure using the Kohn-Sham local spin-density formalism. At maximal polarization in the contact area, there is a bifurcation into ground-state and metastable solutions. The conduction associated with the metastability is lower than for the normal state. With increasing temperature, the
conductance
should therefore show an anomalous behavior as observed. For the present device we do not recover resonance or quasibound states.
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Держатели документа:
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Yakimenko, I. I.; Berggren, K. F.
}
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10.
Jauho, A. P.
Simulations of interference effects in gated two-dimensional ballistic electron systems / A. P. Jauho, K. N. Pichugin, A. F. Sadreev> // Phys. Rev. B. - 1999. -
Vol. 60
,
Is. 11
. - P. 8191-8198,
DOI
10.1103/PhysRevB.60.8191. - Cited References: 26 . - ISSN 0163-1829
РУБ
Physics, Condensed Matter
Рубрики:
CIRCULAR BENDS
WAVE-GUIDES
QUANTUM
CONDUCTANCE
FLOW
GAS
Аннотация:
We present detailed simulations addressing recent electronic interference experiments,where a metallic gate is used to locally modify the Fermi wavelength of the charge carriers. Our numerical calculations are based on a solution of the one-particle Schrodinger equation for a realistic model of the actual sample geometry, including a Poison equation-based determination of the potential due to the gate. The
conductance
is determined with the multiprobe Landauer-Buttiker formula, and in general we find
conductance
vs gate voltage characteristics, which closely resemble the experimental traces. A detailed examination based on quantum-mechanical streamlines suggests that the simple one-dimensional semiclassical model often used to describe the experiments has only a limited range of validity, and that certain ''unexpected" periodicities should not be assigned any particular significance, they arise due to the complicated multiple scattering processes occurring in certain sample geometries.
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Держатели документа:
Tech Univ Denmark, Mikroelekt Ctr, DK-2800 Lyngby, Denmark
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Acad Sci Czech Republ, Inst Phys, CR-16200 Prague, Czech Republic
Abo Akad Univ, Dept Phys, SF-20500 Turku, Finland
ИФ СО РАН
Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович
}
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