Back to Search
Start Over
Effect of double quantum dot asymmetry on electron localization.
- Source :
-
Modern Physics Letters B . 7/30/2024, Vol. 38 Issue 21, p1-21. 21p. - Publication Year :
- 2024
-
Abstract
- In this paper, we study the localization of an electron in a binary quantum system formed by a pair of quantum dots (QDs). The traditional theoretical consideration of such systems is limited to the symmetrical case when QDs in such double quantum dot (DQD) are assumed identical in all respects. In this paper, we model the effects of breaking QD similarities in a DQD by studying two-dimensional (2D) DQDs as a double quantum well (DQW). This is done by solving the Schrödinger equation, with parameters chosen to describe an InAs/GaAs heterostructure. We calculate the energy spectrum of the electron confinement and the spectral distribution of localized/delocalized spatial states. Both symmetric and asymmetric QW shapes are considered and their effects are compared. The effects of symmetry breaking are explained within the framework of the two-level system theory. We delineate the QW weak and strong coupling cases in DQW. In particular, we show that the coherence in ideal DQW is unstable in the case of a weak QW coupling. Within the framework of the proposed approach, a charge qubit realized on a DQD is discussed and, as an example, a qubit based on an almost ideal DQD is proposed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *QUANTUM wells
*ELECTRONS
*QUBITS
*QUANTUM dots
*SYSTEMS theory
*ELECTRON tunneling
Subjects
Details
- Language :
- English
- ISSN :
- 02179849
- Volume :
- 38
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Modern Physics Letters B
- Publication Type :
- Academic Journal
- Accession number :
- 177204706
- Full Text :
- https://doi.org/10.1142/S0217984923420058