Charge Reconfiguration in Isolated Quantum Dot Arrays. Issue 6 (12th March 2019)

• Record Type: Journal Article
• Authors: Bayer, Johannes C.; Wagner, Timo; Rugeramigabo, Eddy P.; Haug, Rolf J.
• Other Names: Ruffenach Sandra guestEditor.; Tchernycheva Maria guestEditor.
• Is Part Of: Annalen der Physik. Volume 531:Issue 6(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-12
• Subjects: charge detector -- charge reconfiguration -- isolated -- quadruple quantum dot -- quantum dots -- single electron -- tunnel coupling; Physics -- Periodicals; Chemistry -- Periodicals; 530.05
• DOI: 10.1002/andp.201800393
• Languages: English
• ISSNs: 0003-3804

Abstract

Abstract: A high level of tunability and control over arrays of quantum dots are key ingredients toward the goal of scalable‐based qubit architectures. Increasing array size simultaneously increases the parameter space and therefore the tuning complexity. The electron reconfiguration behavior of quantum dot arrays isolated from the electron reservoirs is studied experimentally. Isolating a quantum dot array from the reservoirs does not only enable a high degree of control over the tunnel couplings but at the same time drastically simplifies the stability diagrams for small numbers of electrons trapped in the array. Experimental results on double, triple, and quadruple quantum dot arrays are presented and complementary model calculations allow the identification of all transitions observed in the experiment. Highly tunable long‐range transitions are observed in isolated triple quantum dots and evidence of higher‐order cotunneling is found for the quadruple quantum dot array. Abstract : A high level of control over quantum dot arrays is a key ingredient toward semiconductor qubit functionality. Isolating an array from the electron reservoirs significantly simplifies the stability diagrams for small electron numbers, while conserving the tunability. Experimental data and complementary simulations allow the identification of occurring transitions. Herewith cotunneling transitions are found in linear triple and quadruple quantum dots.