Charge frustration in a triangular triple quantum dot
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 transp...
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| Published in | Physical review letters Vol. 110; no. 4; p. 046803 |
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| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
24.01.2013
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| Online Access | Get more information |
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| Abstract | 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. |
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| AbstractList | 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. |
| Author | Chung, Y Mahalu, D Seo, M Sim, H-S Umansky, V Lee, S-Y Kim, N Choi, H K |
| Author_xml | – sequence: 1 givenname: M surname: Seo fullname: Seo, M organization: Department of Physics, Pusan National University, Busan 609-735, Republic of Korea – sequence: 2 givenname: H K surname: Choi fullname: Choi, H K organization: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel – sequence: 3 givenname: S-Y surname: Lee fullname: Lee, S-Y organization: Department of Physics, Pusan National University, Busan 609-735, Republic of Korea – sequence: 4 givenname: N surname: Kim fullname: Kim, N organization: Korea Research Institute of Standard and Science, Daejeon 306-600, Republic of Korea – sequence: 5 givenname: Y surname: Chung fullname: Chung, Y organization: Department of Physics, Pusan National University, Busan 609-735, Republic of Korea – sequence: 6 givenname: H-S surname: Sim fullname: Sim, H-S organization: Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea – sequence: 7 givenname: V surname: Umansky fullname: Umansky, V organization: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel – sequence: 8 givenname: D surname: Mahalu fullname: Mahalu, D organization: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/25166188$$D View this record in MEDLINE/PubMed |
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| Snippet | We experimentally investigate the charge (isospin) frustration induced by a geometrical symmetry in a triangular triple quantum dot. We observe the... |
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