Vertically Coupled Double Quantum Dots Connected In Parallel

2025/07/13 by S. Amaha, Amaha, Shinichi, T. Hatano +5
Computer Science · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Dots Synthesis And Properties #Quantum-Dot Cellular Automata #Semiconductor Quantum Structures and Devices

paper · pdf · doi:10.48550/arxiv.2507.09598

openalex publication_date 2025/07/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report charge transport measurements in a ring-shaped quadruple quantum dot system, composed of two vertically coupled double quantum dots connected in parallel. The vertical coupling introduces an isospin degree of freedom tied to the layer index, and the parallel configuration enables independent access to each quantum dot pair. This design allows us to observe Coulomb diamonds and evaluate the interlayer energy offset. By extending this platform to triangular and hexagonal artificial lattices, we explore correlation effects such as isospin frustration. These results highlight the system's potential for studying interaction-driven quantum phases.

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