Volume 118, Number 6, June 2017
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 August 2017|
Bipolar spin blockade, many-body tunneling and long-range resonance in triple quantum dots
Department of Physics, Renmin University of China - Beijing 100872, China
Received: 2 June 2017
Accepted: 25 July 2017
We investigate the transport properties in triple quantum dots (TQDs) by accurately solving the Anderson three-impurity model under nonequilibrium condition with the hierarchical equations of motion (HEOM) approach. Firstly, we reproduce the experimental features of bipolar Pauli spin blockade (PSB) in doubly-singly-doubly occupied TQDs, where the current is strongly suppressed in both bias directions. Then, we predict similar features in singly-doubly-singly occupied TQDs and find that the many-body tunneling dominates the transport in the strongly correlated regime in both structures. Finally, we demonstrate the long-range resonance between two edge dots characterized by the current enhancement, which is in agreement with experiments. It indicates that the long-range quantum coherence can play an important role near the PSB region, which provides a possible way to achieve distance quantum simulation and computation.
PACS: 73.63.-b – Electronic transport in nanoscale materials and structures / 73.63.Kv – Quantum dots / 74.25.F- – Transport properties
© EPLA, 2017
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