2013/01/24 by M. Seo, Minky Seo, Hyung Kook Choi +10 · 94 citations
Materials Science · Physics and Astronomy · #Charge (physics) #Condensed matter physics #Degeneracy (biology) #Degenerate energy levels #Frustration #Geometrical frustration #Geometry #Ground state #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Symmetry (geometry) #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.110.046803
published in Physical Review Letters 110(4), 046803 (American Physical Society) · 5 pages, 4 figures
openalex publication_date 2013/01/24 · arxiv created 2014/02/26 · arxiv updated 2014/02/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We experimentally investigate the charge (isospin) frustration induced by a geometrical symmetry in a triangular triple quantum dot. We observe the ground-state charge configurations of sixfold degeneracy, the manifestation of the frustration. The frustration results in omnidirectional charge transport, and it is accompanied by nearby nontrivial triple degenerate states in the charge stability diagram. The findings agree with a capacitive interaction model. We also observe unusual transport by the frustration, which might be related to elastic cotunneling and the interference of trajectories through the dot. This work demonstrates a unique way of studying geometrical frustration in a controllable way.