Strongly electrostatically coupled quantum dots with separate leads

Wilhelm, U.; Weis, J.

doi:10.1016/s1386-9477(99)00148-4

Cited by 32 publications

(59 citation statements)

References 17 publications

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“…We also study the conductance in strong magnetic fields, where the system is completely polarized, and the remaining inter-dot charge fluctuations are described by the SU(2) Kondo model subjected to the energy difference δE [22,23,24]. The results obtained in both cases are shown in FIG.…”

Section: Asymmetric Double Dots: Gate-voltage Controlmentioning

confidence: 99%

Kondo effect in multiple-dot systems

Sakano

Kawakami

2005

Phys. Rev. B

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We study the Kondo effect in multiple-dot systems for which the inter-as well as intra-dot Coulomb repulsions are strong, and the inter-dot tunneling is small. The application of the WardTakahashi identity to the inter-dot dynamical susceptibility enables us to analytically calculate the conductance for a double-dot system by using the Bethe-ansatz exact solution of the SU(4) impurity Anderson model. It is clarified how the inter-dot Kondo effect enhances or suppresses the conductance under the control of the gate voltage and the magnetic field. We then extend our analysis to multiple-dot systems including more than two dots, and discuss their characteristic transport properties by taking a triple-dot system as an example.

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Section: Asymmetric Double Dots: Gate-voltage Controlmentioning

confidence: 99%

Kondo effect in multiple-dot systems

Sakano

Kawakami

2005

Phys. Rev. B

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“…In such systems, not only the ordinary spin Kondo effect [15,16] but also the orbital Kondo effect due to the interplay between orbital and spin degrees of freedom occurs; the Kondo effect in multiple-dot systems [17,18,19,20,21,22,23,24,25,26], the singlet-triplet Kondo effect [27,28,29,30], and the SU(4) Kondo effect in single-dot systems [31,32,33,34,35].…”

Section: Introductionmentioning

confidence: 99%

Conductance via the multiorbital Kondo effect in single quantum dots

Sakano

Kawakami

2006

Phys. Rev. B

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We study the Kondo effect in a single quantum dot system with two or three orbitals by using the Bethe-ansatz exact solution at zero temperature and the non-crossing approximation at finite temperatures. For the two-orbital Kondo effect, the conductance is shown to be constant at absolute zero in any magnetic fields, but decrease monotonically with increasing fields at finite temperatures. In the case with more orbitals, the conductance increases at absolute zero, while it features a maximum structure as a function of the magnetic field at finite temperatures. We discuss how these characteristic transport properties come from the multi orbital Kondo effect in magnetic fields.

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“…[30][31][32][33][34][35] Figures 1b,c show Coulomb blockade resonances measured simultaneously in both ribbons at small applied bias voltages and as a function of the gate voltages V BG and V TL , revealing the charge stability diagram of a double quantum dot with capacitive coupling. 22,23,[36][37][38][39][40][41] . The coupling capacitance between the two dots is estimated directly from the charge stability diagrams and finite bias measurements to be C BT ≈ 10 − 20 aF 21 .…”

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confidence: 99%

Measurement Back-Action in Stacked Graphene Quantum Dots

et al. 2015

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We present an electronic transport experiment in graphene where both classical and quantum mechanical charge detector back-action on a quantum dot are investigated. The device consists of two stacked graphene quantum dots separated by a thin layer of boron nitride. This device is fabricated by van der Waals stacking and is equipped with separate source and drain contacts to both dots. By applying a finite bias to one quantum dot, a current is induced in the other unbiased dot. We present an explanation of the observed measurement-induced current based on strong capacitive coupling and energy dependent tunneling barriers, breaking the spatial symmetry in the unbiased system. This is a special feature of graphene-based quantum devices. The experimental observation of transport in classically forbidden regimes is understood by considering higher order quantum mechanical back-action mechanisms.

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Strongly electrostatically coupled quantum dots with separate leads

Cited by 32 publications

References 17 publications

Kondo effect in multiple-dot systems

Kondo effect in multiple-dot systems

Conductance via the multiorbital Kondo effect in single quantum dots

Measurement Back-Action in Stacked Graphene Quantum Dots

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