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Monday, August 11 • 14:00 - 16:00
Transport in Heterostructures I

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Invited: Gloria Platero

Superexchange Transport & Blockade in Triple Quantum Dots

Quantum mechanics allows for superpositions of indirectly coupled states even if the intermediate states are far in energy. This is done via superexchange: higher order transitions in which the energetically forbidden intermediate states are only virtually occupied. The recently achieved control and tunability of triple quantum dots open the possibility to investigate phenomena relying on quantum superpositions of distant states mediated by tunneling. We discuss recent experiments in triple dots where clear evidence of long range transport is found. Superexchange is responsible for the indirect spin-dependent coupling of the two outer dots, mediated by virtual transitions through the middle one. Long range electron transfer is manifested as sharp current resonances at the degeneracy points of states with left-right symmetric charge distributions [1,2]. The transitions can take two paths: two electrons in different dots tunnel simultaneously [1] or a single electron tunnels twice [2]. In this last case a delocalized electron between the left and right dot transfers the spin state from one end to the other. We also analyze a configuration where two paths with different virtual intermediate states are possible leading to quantum interference. Remarkably, we find conditions where destructive interference of these transitions cancels the transport, what we call superexchange blockade [3].

[1] M. Busl et al., Nature Nanotech. 8, (2013) 261
(2) R. Sánchez et al., Phys. Rev. Lett. 112, 176803 (2014)
(3) R. Sánchez et al., Phys. Rev. B 89, 161402(R) (2014)

Oral: Shinichi Amaha
LO-Phonon Assisted Coherent Tunneling in Vertically Coupled Double Quantum Dots
Co-authors: Rin Okuyama, Tsuyoshi Hatano, Mikio Eto, Seigo Tarucha

Jason C. H. Chen
Electron Transport in a Double Quantum Dot Induced by a Surface Acoustic Wave Cavity Mode
Co-authors: Reo Kosaka, Masayuki Hashisaka, Koji Muraki, Toshimasa Fujisawa

Natalia Stepina
Transport & Magnetotransport in One-Dimensional Tunnel Coupled Quantum Dot Chains
Co-authors: Zhanna Smagina, Vitalii Valkovskii, Anatolii Dvurechenskii

Bahram Ganjipour
Excited State Spectrum of a p-type GaSb/InAs Core/Shell Nanowire Quantum Dot
Co-authors: B. Mattias Borg, Lars-Erik Wernersson, Lars Samuelson, H. Q. Xu, Claes Thelander

Andrei Sergeev
Adaptable Quantum Dot Nanomaterials with Controllable Kinetics
Co-authors: Vladimir Mitin, Nizami Vagidov, Kimberly Sablon, John Little, Kitt Reinhardt

Michihisa Yamamoto
Transmission Phase through a Quantum Dot Near Crossover from Single-Level to Multi-Level Transport
Co-authors: Shintaro Takada, Christopher Bauerle, Andreas Wieck, Seigo Tarucha

Session Chairs

Sven Rogge

Professor, University of New South Wales
After completing his undergraduate studies at the Universität Karlsruhe in Germany, Sven moved to Stanford University (USA) joining the research group of Douglas D. Osheroff and in 1997 was awarded his PhD in physics. As a postdoctoral researcher at Delft University of Technology (Netherlands), his research focused on atomic-scale electronics with the twofold aim of realising quantum electronics in silicon and establishing atomistic-device... Read More →


Gloria Platero

Instituto de Ciencia de Materiales de Madrid
Gloria Platero did her PhD at the Autonomous University of Madrid. She then spent two years at the Max Planck Institute for High Magnetic Fields in Grenoble (France) as a postdoctoral researcher. Afterwards she got a permanent position at the Solid State Institute of the Spanish research council (CSIC). At present, she is a Research Professor at the Material Science Institute of Madrid (CSIC). | | She is the head of the research group in Madrid... Read More →

Monday August 11, 2014 14:00 - 16:00
Room 17A

Attendees (13)