Effect of double quantum dot asymmetry on electron localization

Filikhin, Igor; Karoui, Abdennaceur; Zatezalo, Tanja; Kruchinin, Sergei P.; Vlahovic, Branislav

doi:10.1142/s0217984923420058

Effect of double quantum dot asymmetry on electron localization

Journal Article · Thu Nov 30 00:00:00 EST 2023 · Modern Physics Letters B

DOI:https://doi.org/10.1142/s0217984923420058· OSTI ID:2506741

^[1]; ^[2]; Zatezalo, Tanja ^[2]; ^[3]; ^[2]

North Carolina Central University, Durham, NC (United States); North Carolina Central University
North Carolina Central University, Durham, NC (United States)
Bogolyubov Institute for Theoretical Physics, Kiev (Ukraine); University of Leipzig (Germany)

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.

View Accepted Manuscript (DOE)

Research Organization:: North Carolina Central University, Durham, NC (United States)

Sponsoring Organization:: DHS; US National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003979

OSTI ID:: 2506741

Journal Information:: Modern Physics Letters B, Journal Name: Modern Physics Letters B Journal Issue: 21 Vol. 38; ISSN 0217-9849

Publisher:: World Scientific PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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