The role of intersubband mixing in single-electron charging of open quantum dot

Baksheyev, D. G.; Ткаченко, О. А.; Ткаченко, В. А.

doi:10.1016/s1386-9477(99)00204-0

Cited by 9 publications

(10 citation statements)

References 5 publications

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“…The calculated potential U(x,y) for these structures is symmetrical relative to the lines x = 0 and y = 0 (see figs 1, 2 [7], fig. 1 [12] and figs 4-6 [13]). The 0.7 µm diameter ring interferometer in question has an axial symmetry except for the small (0.2 µm) regions at the connections between the 100 nm wide ring channel and the supplying quantum wires having the same width.…”

Section: Introductionmentioning

confidence: 95%

“…The other is the open quantum dot with a size of approx. 0.7 µm created at the Cavendish Laboratory, UK, using a three-layered system of submicron and ultrathin (60 nm) metallic gates [10][11][12][13][14]. To create these devices the ISP SB RAS and the Cavendish Laboratory have improved the parameters of GaAs/AlGaAs heterostructure molecular beam epitaxy process and obtained 2D electron gas with a low-temperature mobility of 0.5 × 10 6 and 2.5 × 10 6 cm 2 /(V × s), respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Comparatively large dimensions of these devices (0.7 µm) combined with the high quality of the 2D electron gas and nanolithography allowed ignoring the disorder in the first approximation. The self-consistent solution of the 3D electrostatics problem provided for close-to-real simple forms of effective 2D potential U(x,y) that can be used for calculating the conductance of the devices in a zero magnetic field [7,[12][13][14]. The calculated potential U(x,y) for these structures is symmetrical relative to the lines x = 0 and y = 0 (see figs 1, 2 [7], fig.…”

Section: Introductionmentioning

confidence: 99%

“…The electrostatic potential of the modeled quantum dot has a very simple form unlike the potentials of other quantum dots because it allows separating the variables x and y when solving the quantum scattering problem in a zero magnetic field. Calculations of U(x,y) and simulation of the measured gate characteristics [7] led to the discovery of triangular quantum dots at the entrance and exit of the ballistic ring, and it was found [12][13][14] that the earlier reported quantum dot [10,11] is quasi-one-dimensional, i.e., intersubband scattering is suppressed there in contrast to the typical ballistic quantum dots. These discoveries allowed one to explain the unusual physical phenomena that were observed experimentally.…”

Section: Introductionmentioning

confidence: 99%

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Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer

Ткаченко¹,

Baksheev²,

Ткаченко³

2020

MoEM

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Magnetotransport in two submicron-sized devices formed on the basis of GaAs/AlGaAs structures has been simulated using nonequilibrium Green functions. The effect of a perpendicular magnetic field on quantum transport in a quasi-one-dimensional quantum dot and in an Aharonov–Bohm interferometer has been analyzed in a single-particle approximation. Magnetic field oscillations of two-terminal conductance of the devices, equilibrium (persistent) current distributions and magnetic moment generated in the devices by persistent currents have been determined using numerical methods. Correlations between the magnetic moment, magnetic field oscillations of conductance and energy resonance in a specific magnetic field have been traced. Sufficiently regular conductance oscillations similar to Aharonov–Bohm ones have been revealed for a quasi-one-dimensional quantum dot at small magnetic fields (0.05–0.4 T). For a ring interferometer the contribution to the total equilibrium current and magnetic moment at a specific energy may change abruptly both in magnitude and in sign as a result of changing magnetic field within one Aharonov–Bohm oscillation. We show that the conductance of an interferometer is determined not by the number of modes propagating in the ring but rather by the effect of triangular quantum dots at the ring entrance that produce a strong reflection. The period of the calculated Aharonov–Bohm oscillations is in agreement with the measurement results for these devices.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer

Ткаченко¹,

Baksheev²,

Ткаченко³

2020

MoEM

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“…Another possibility is the use of the torsional effects in oligophenyleneethynylene, whereby the rotation of one ring with respect to the others yields a large change in conductance [26], [27], [100]. The use of charge methods, where the net charge is simply one or two electrons, is also being extensively studied by several research groups [101]- [103]. All these mechanisms can also be used in nanocells.…”

Section: Possible Solutions To the Physical Limitation Problemsmentioning

confidence: 99%

The Nanocell: A Chemically Assembled Molecular Electronic Circuit

Seminario

Tarigopula

2006

IEEE Sensors J.

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Computing is one of the most demanding applications of integrated circuits (IC). It requires the highest possible speed to process information. Higher speeds imply smaller circuits and, therefore, higher densities of integration. Thus, the most effective way to make faster circuits is by "scaling down," i.e., reducing the device size proportionally. However, under present technology, miniaturization is mainly constrained by the amount of heat dissipated as the number of devices increases per unit area and by the ability of lithographic tools to chisel smaller details on bulk substrates; these are technical constraints. However, there are physical or natural constraints which are practically material independent (speed of light, size of atoms, response of the electron, and Planck constant). Two main scenarios have been proposed for using molecules or small group of atoms (clusters) to build devices able to perform logical operations, bypassing, to some extent, problems undermining miniaturization or scaling-down processes for IC. One approach is the crossbar; a promising technology that uses directed self-assembly to make nanoarrays similar in shape to those already fabricated at larger scales by standard electronics. The other approach is the nanocell, which is a complementary design in the sense that it builds up (bottom-up) from single molecules into precise and complex structures that can be approached by standard lithography. This paper focuses on the description, advances, and possibilities of the nanocell approach, which takes advantage of the great skills developed by chemists to synthesize molecules with precise arrangements of atoms in a molecule. The nanocell concept does not require a deterministic assembly or deposition of molecules and clusters, thanks to the recently discovered programmability feature of molecules. Thus, in this paper, it is shown that the nanocell is a feasible concept for the development of electronics beyond deterministic lithographic approaches presently used in the fabrication of IC. The great importance and advantage of having molecular size computing devices is their ability to interact directly with external agents or molecules producing a sensor device already attached to a nanoprocessor that is able to strongly help in the stand-off detection of chemical and biological agents.

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Modeling of Quantum Transport and Single-Electron Charging in GaAs/AlGaAs-Nanostructures

Ткаченко

Kvon

et al. 2017

Advances in Semiconductor Nanostructures

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The role of intersubband mixing in single-electron charging of open quantum dot

Cited by 9 publications

References 5 publications

Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer

Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer

The Nanocell: A Chemically Assembled Molecular Electronic Circuit

Modeling of Quantum Transport and Single-Electron Charging in GaAs/AlGaAs-Nanostructures

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