Tunneling Transport in Quantum Dots Formed by Coupled Dopant Atoms

2015 ◽  
Vol 1117 ◽  
pp. 78-81
Author(s):  
Daniel Moraru ◽  
Arup Samanta ◽  
Takahiro Tsutaya ◽  
Yuki Takasu ◽  
Takeshi Mizuno ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Spectrum ◽  
Low Temperatures ◽  
Doping Concentration ◽  
Strongly Coupled ◽  
Impurity Atoms ◽  
Dopant Impurity ◽  
Dopant Atoms ◽  
Advanced Applications ◽  
Tunneling Transport

In silicon nanoscale transistors, dopant (impurity) atoms can significantly affect transport characteristics, in particular at low temperatures. Coupling of neighboring dopants in such devices is essential in defining the properties for transport. In this work, we briefly present a comparison of different regimes of inter-dopant coupling, controlled by doping concentration and, to some extent, by selective, local doping. Tunneling-transport spectroscopy can reveal the energy spectrum of isolated dopants and of strongly-coupled dopant atoms. Interactions of multiple-dopants quantum dots (QDs) and satellite individual dopant-traps, as observed in some devices, can provide further information to bridge such inter-dopant coupling regimes for more advanced applications.

scholarly journals Atomic Self-ordering in Heteroepitaxially Grown Semiconductor Quantum Dots due to Relaxation of External Lattice Mismatch Strains

2001 ◽  
Vol 696 ◽  
Author(s):  
Peter Möck ◽  
Teya Topuria ◽  
Nigel D. Browning ◽  
Robin J. Nicholas ◽  
Roger G. Booker
Keyword(s):  
Quantum Dots ◽  
Low Temperatures ◽  
Short Range ◽  
Lattice Mismatch ◽  
Life Time ◽  
Semiconductor Quantum Dots ◽  
Quantum Dot Lasers ◽  
Atomic Order ◽  
Transmission Electron ◽  
Gaas Quantum Dot

AbstractThermodynamic arguments are presented for the formation of atomic order in heteroepitaxially grown semiconductor quantum dots. From thermodynamics several significant properties of these systems can be derived, such as an enhanced critical temperature of the disorder-order transition, the possible co-existence of differently ordered domains of varying size and orientation, the possible existence of structures that have not been observed before in semiconductors, the occurrence of atomic order over time, and the occurrence of short range order when the growth proceeds at low temperatures. Transmission electron microscopy results support these predictions. Finally, we speculate on the cause for the observed increase in life time of (In,Ga)As/GaAs quantum dot lasers [H-Y. Liu et al., Appl. Phys. Lett. 79, 2868 (2001)].

Quantum Dots Microstructure and Energy Spectrum Peculiarities

2005 ◽  
pp. 439 ◽  
Author(s):  
S. B. Erenburg ◽  
N. V. Bausk ◽  
L. N. Mazalov ◽  
A. I. Nikiforov ◽  
A. I. Yakimov
Keyword(s):  
Quantum Dots ◽  
Energy Spectrum

ANTI-RESONANCES OF TUNNELING THROUGH A QUANTUM WIRE WITH SIDE-COUPLED QUANTUM DOTS

2001 ◽  
Vol 15 (31) ◽  
pp. 4111-4121 ◽  
Author(s):  
JIN-FU FENG ◽  
SHI-JIE XIONG
Keyword(s):  
Quantum Dots ◽  
Single Particle ◽  
Low Temperatures ◽  
Quantum Wire ◽  
Coulomb Blockade ◽  
Destructive Interference ◽  
Channel Network ◽  
Coupled Quantum Dots ◽  
Coulomb Blockade Regime ◽  
Simple Summation

We study the transport properties of electrons in a quantum wire with side-coupled quantum dots in Coulomb blockade regime by the use of the equivalent single-particle multi-channel network and Landauer formula. At low temperatures the calculated dependence of the conductance on the gate voltage of dots exhibits two dips, indicating the destructive interference of the wave directly transmitted through the wire and the wave reflected from the dots. In a wire with more than one side-coupled dots the suppression of conductance is a simple summation of the effects of scattering of all the dots. The possibility of fabricating tunable switch devices by using such structures is discussed.

scholarly journals Features of the energy spectrum of indium antimonide quantum dots

2017 ◽  
pp. 596-599 ◽  
Author(s):  
A.I. Mikhailov ◽  
V.F. Kabanov ◽  
N.D. Zhukov ◽  
E.G. Glukhovskoy
Keyword(s):  
Quantum Dots ◽  
Energy Spectrum ◽  
Indium Antimonide

scholarly journals Energy Spectrum of InAs Quantum Dots in GaAs/AlAs Superlattices

2008 ◽  
Vol 113 (3) ◽  
pp. 975-978 ◽  
Author(s):  
R. Nedzinskas ◽  
B. Čechavičius ◽  
J. Kavaliauskas ◽  
V. Karpus ◽  
G. Krivaitė ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Spectrum ◽  
Inas Quantum Dots

Ion bulk speeds and temperatures in the diamagnetic cavity of comet 67P

2021 ◽  
Author(s):  
Sofia Bergman ◽  
Gabriella Stenberg Wieser ◽  
Martin Wieser ◽  
Fredrik Leffe Johansson ◽  
Erik Vigren ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Low Energy ◽  
High Time Resolution ◽  
Langmuir Probes ◽  
Ion Distribution ◽  
Strongly Coupled ◽  
Neutral Particles ◽  
Spacecraft Potential ◽  
Impedance Probe ◽  
Comet 67P

<p>The formation and maintenance of the diamagnetic cavity around comets is a debated subject. For active comets such as 1P/Halley, the ion-neutral drag force is suggested to balance the outside magnetic pressure at the cavity boundary, but measurements made by Rosetta at the intermediately active comet 67P/Churyumov-Gerasimenko indicate that the situation might be different at less active comets. Measurements from the Langmuir probes and the Mutual Impedance Probe on board Rosetta, as well as modelling efforts, show ion velocities significantly above the velocity of the neutral particles, indicating that the ions are not as strongly coupled to the neutrals at comet 67P.</p><p>In this study we use low-energy high time resolution data from the Ion Composition Analyzer (ICA) on Rosetta to determine the bulk speeds and temperatures of the ions inside the diamagnetic cavity of comet 67P. The interpretation of the low-energy data is not straight forward due to the complicated influence of the spacecraft potential, but a newly developed method utilizing simulations with the Spacecraft Plasma Interaction Software (SPIS) software makes it possible to extract the original properties of the ion distribution. We use SPIS to model the influence of the spacecraft potential on the energy spectrum of the ions, and fit the energy spectrum sampled by ICA to the simulation results. This gives information about both the bulk speed and temperature of the ions.</p><p>The results show bulk speeds of 5-10 km/s, significantly above the speed of the neutral particles, and temperatures of 0.7-1.6 eV. The major part of this temperature is attributed to ions being born at different locations in the coma, and could hence be considered a dispersion rather than a temperature in the classical sense. The high bulk speeds support previous results, indicating that the collisional coupling between ions and neutrals is weak inside the diamagnetic cavity.</p>

Fragmentation of Magic‐Size Cluster Precursor Compounds into Ultrasmall CdS Quantum Dots with Enhanced Particle Yield at Low Temperatures

2020 ◽  
Vol 59 (29) ◽  
pp. 12013-12021 ◽  
Author(s):  
Lijia Li ◽  
Jing Zhang ◽  
Meng Zhang ◽  
Nelson Rowell ◽  
Chunchun Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Low Temperatures ◽  
Cds Quantum Dots ◽  
Cluster Precursor ◽  
Particle Yield

scholarly journals Shot noise in transport through two coherent strongly coupled quantum dots

2006 ◽  
Vol 73 (19) ◽  
Author(s):  
Jasmin Aghassi ◽  
Axel Thielmann ◽  
Matthias H. Hettler ◽  
Gerd Schön
Keyword(s):  
Quantum Dots ◽  
Shot Noise ◽  
Coupled Quantum Dots ◽  
Strongly Coupled
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