scholarly journals Single-particle and collective excitations in quantum wires made up of vertically stacked quantum dots: Zero magnetic field

2011 ◽  
Vol 135 (12) ◽  
pp. 124704 ◽  
Author(s):  
Manvir S. Kushwaha
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Single Particle ◽  
Quantum Wires ◽  
Collective Excitations ◽  
Zero Magnetic Field ◽  
Stacked Quantum Dots

scholarly journals Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field

2020 ◽  
Vol 34 (36) ◽  
pp. 2150173
Author(s):  
Manvir S. Kushwaha
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Quantum Computation ◽  
Dielectric Function ◽  
Single Particle ◽  
Fermi Energy ◽  
Quantum Wires ◽  
Random Phase ◽  
Collective Excitations ◽  
Stacked Quantum Dots

A theoretical investigation has been made of the magnetoplasmon excitations in a quasi-one-dimensional electron system composed of vertically stacked, self-assembled InAs/GaAs quantum dots. The smaller length scales involved in the experiments impel us to consider a perfectly periodic system of two-dimensionally confined InAs quantum dot layers separated by GaAs spacers. Subsequent system is subjected to a two-dimensional confining (harmonic) potential in the [Formula: see text]–[Formula: see text] plane and an applied magnetic field (B) in the symmetric gauge. This scheme defines virtually a system of quantum wire comprised of vertically stacked quantum dots (VSQD). We derive and discuss the Dyson equation, the generalized (nonlocal and dynamic) dielectric function, and the inverse dielectric function for investigating the single-particle and collective (magnetoplasmon) excitations within the framework of (full) random-phase approximation (RPA). As an application, we study the influence of the confinement potential and the magnetic field on the component eigenfunctions, the density of states (DOS), the Fermi energy, the collective excitations, and the inverse dielectric functions. How the B-dependence of DOS validate the VSQD mimicking the realistic quantum wires, the Fermi energy oscillates as a function of the Bloch vector, the intersubband single-particle continuum bifurcates at the origin, a collective excitation emerges and propagates within the gap of the split single-particle continuum, and the alteration in the well- and barrier-widths allows to customize the excitation spectrum in the desired energy range are some of the remarkable features of this investigation. These findings demonstrate, for the very first time, the significance of investigating the system of VSQD subjected to a quantizing magnetic field. Given the edge over the planar quantum dots and the foreseen applications in the single-electron devices and quantum computation, investigating the system of VSQD is deemed vital. The results suggest exploiting magnetoplasmon qubits to be a potential option for implementing the solemn idea of quantum state transfer in devising quantum gates for the quantum computation and quantum communication networks.

scholarly journals Nuclear magnetization in gallium arsenide quantum dots at zero magnetic field

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
G. Sallen ◽  
S. Kunz ◽  
T. Amand ◽  
L. Bouet ◽  
T. Kuroda ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Gallium Arsenide ◽  
Zero Magnetic Field ◽  
Nuclear Magnetization

scholarly journals Молекулярные состояния композитных фермионов в самоорганизованных квантовых точках InP/GaInP в нулевом внешнем магнитном поле

2020 ◽  
Vol 54 (2) ◽  
pp. 138
Author(s):  
А.М. Минтаиров
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Near Field ◽  
Optical Microscope ◽  
Zero Magnetic Field ◽  
Composite Fermions ◽  
Photoluminescence Spectra ◽  
Topological Quantum ◽  
Near Field Scanning ◽  
The Magnetic Field

Abstract The size and positions of regions of line localization and the magnetic-field (0–10 T) dependence of the low-temperature (10 K) photoluminescence spectra of single InP/GaInP quantum dots with a number of electrons of N = 5–7 and a Wigner–Seitz radius of ~2.5 are determined using a near-field scanning optical microscope. The formation of composite fermion molecules with a size coinciding with that of localization regions and bond lengths of ~30 and 50 nm, respectively, at a Landau-level filling factor from 1/2 to 2/7 in zero magnetic field is established. At N = 6, the pairing and rearrangement of composite fermions under photoexcitation are found, which offers opportunities for the use of InP/GaInP quantum dots to create a magnetic-field-free topological quantum gate.

Spin splitting of one-dimensional subbands in high quality quantum wires at zero magnetic field

2000 ◽  
Vol 62 (23) ◽  
pp. 15842-15850 ◽  
Author(s):  
K. S. Pyshkin ◽  
C. J. B. Ford ◽  
R. H. Harrell ◽  
M. Pepper ◽  
E. H. Linfield ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Wires ◽  
Spin Splitting ◽  
Zero Magnetic Field ◽  
High Quality ◽  
One Dimensional

Hund's First and Second Rules in Spherical Quantum Dots (I) in the Zero-Magnetic Field

2004 ◽  
Vol 43 (7A) ◽  
pp. 4424-4433 ◽  
Author(s):  
Yusuke Asari ◽  
Kyozaburo Takeda ◽  
Hiroyuki Tamura
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Zero Magnetic Field

scholarly journals Spin depolarization in quantum wires polarized spontaneously in zero magnetic field

2004 ◽  
Vol 70 (15) ◽  
Author(s):  
N. T. Bagraev ◽  
I. A. Shelykh ◽  
V. K. Ivanov ◽  
L. E. Klyachkin
Keyword(s):  
Magnetic Field ◽  
Quantum Wires ◽  
Zero Magnetic Field ◽  
Spin Depolarization
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