Aharonov-Bohm Oscillations Changed by Indirect Interdot Tunneling via Electrodes in Parallel-Coupled Vertical Double Quantum Dots

Hatano, T.; Kubo, T.; Tokura, Y.; Amaha, S.; Teraoka, S.; Tarucha, Seigo

doi:10.1103/physrevlett.106.076801

Cited by 50 publications

(69 citation statements)

References 17 publications

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“…3(a). AB oscillations may offer an interesting subject to study the coherent transport through one or two QDs such as a phase shift through QDs 26 and a phase difference between two electron states of singlet and triplet 27,28 .…”

Section: Resultsmentioning

confidence: 99%

A triangular triple quantum dot with tunable tunnel couplings

Noiri

Kawasaki

Otsuka

et al. 2017

Semicond. Sci. Technol.

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Abstract:A two-dimensional arrangement of quantum dots with finite inter-dot tunnel coupling provides a promising platform for studying complicated spin correlations as well as for constructing large-scale quantum computers. Here, we fabricate a tunnel-coupled triangular triple quantum dot with a novel gate geometry in which three dots are defined by positively biasing the surface gates. At the same time, the small area in the center of the triangle is depleted by negatively biasing the top gate placed above the surface gates. The size of the small center depleted area is estimated from the Aharonov-Bohm oscillation measured for the triangular channel but incorporating no gate-defined dots, with a value consistent with the design. With this approach, we can bring the neighboring gate-defined dots close enough to one another to maintain a finite inter-dot tunnel coupling. We finally confirm the presence of the inter-dot tunnel couplings in the triple quantum dot from the measurement of tunneling current through the dots in the stability diagram. We also show that the charge occupancy of each dot and that the inter-dot tunnel couplings are tunable with gate voltages. Keywords:Semiconductor quantum dot, two-dimensional array, tunnel coupling, Aharonov-Bohm oscillation 2 Introduction:

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Section: Resultsmentioning

confidence: 99%

A triangular triple quantum dot with tunable tunnel couplings

Noiri

Kawasaki

Otsuka

et al. 2017

Semicond. Sci. Technol.

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“…In very recent experiment Tarucha et al 28 observed that the period of the Aharonov-Bohm oscillations are halved and the phase changes by half a period for the antibonding state from those of the bonding. They conclude that these features can be related to the indirect interdot coupling via the two electrodes.…”

Section: Introductionmentioning

confidence: 99%

The role of the indirect tunneling processes and asymmetry in couplings in orbital Kondo transport through double quantum dots

Trocha¹

2012

J. Phys.: Condens. Matter

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System of two quantum dots attached to external electrodes is considered theoretically in orbital Kondo regime. In general, the double dot system is coupled via both Coulomb interaction and direct hoping. Moreover, the indirect hopping processes between the dots (through the leads) are also taken into account. To investigate system's electronic properties we apply slave-boson mean field (SBMF) technique. With help of the SBMF approach the local density of states for both dots and the transmission (as well as linear and differencial conductance) is calculated. We show that Dicke-and Fano-like line shape may emerge in transport characteristics of the double dot system. Moreover, we observed that these modified Kondo resonances are very susceptible to the change of the indirect coupling's strength. We have also shown that the Kondo temperature become suppressed with increasing asymmetry in the dot-lead couplings when there is no indirect coupling. Moreover, when the indirect coupling is turned on the Kondo temperature becomes suppressed. By allowing a relative sign of the nondiagonal elements of the coupling matrix with left and right electrode, we extend our investigations become more generic. Finally, we have also included the level renormalization effects due to indirect tunneling, which in most papers is not taken into account.

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“…How to use the AB oscillations to discern molecular parities has been theoretically 45 and experimentally studied. 44 By properly combining it with the spin-orbit interaction, mixed actions of charge and spin interference have been shown to give rise to full spin-polarized transport. 46,47 The AB interference is also useful to affect the occupation difference between degenerate QDs 48 and modulate the current noises.…”

Section: Introductionmentioning

confidence: 99%

“…41 Evoking the AB effect with artificial molecules has been realised by putting two QDs on the two arms of a mesoscopic interferometer. [42][43][44] This is known as the doublequantum-dot (DQD) AB interferometer. Such setups offer the advantages of incorporating molecular symmetry into the flux-modulated interference effects.…”

Section: Introductionmentioning

confidence: 99%

Transient probing of the symmetry and the asymmetry of electron interference

Aharony

Entin‐Wohlman

et al. 2016

Phys. Rev. B

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The transient processes of electron transport in nano-scale devices exhibit special phenomena that exist only in the transient regime. Besides how fast the steady states are approached, one interesting aspect of transient transport arises from its strong dependence on the initial state of the system.Here we address the issue of how the symmetries embedded in the initial state interplay with those of the system structure in the course of transient transports. We explicitly explore the transient currents arising from various initial occupations in a double-quantum-dot Aharonov-Bohm interferometer. We find symmetry relations between the transient in-tunneling and out-tunneling dynamics for initially empty or full quantum dots when the energy levels in the electrodes are symmetrically distributed with respect to the energy levels in the QDs. This is true for whatever applied fluxes. We also find the flux-even components of the currents and the flux-odd components of the currents exhibit distinct cross-lead symmetric relations.

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Aharonov-Bohm Oscillations Changed by Indirect Interdot Tunneling via Electrodes in Parallel-Coupled Vertical Double Quantum Dots

Cited by 50 publications

References 17 publications

A triangular triple quantum dot with tunable tunnel couplings

A triangular triple quantum dot with tunable tunnel couplings

The role of the indirect tunneling processes and asymmetry in couplings in orbital Kondo transport through double quantum dots

Transient probing of the symmetry and the asymmetry of electron interference

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