Tunable Nonadiabatic Excitation in a Single-Electron Quantum Dot

Kataoka, M.; Fletcher, J. D.; See, P.; Giblin, S. P.; Janssen, T.J.B.M.; Griffiths, Jonathan; Jones, G. A. C.; Farrer, I.; Ritchie, D. A.

doi:10.1103/physrevlett.106.126801

Cited by 69 publications

(73 citation statements)

References 17 publications

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“…This scenario agrees with a nonadiabatic excitation of an electron in a dynamical quantum dot observed in Ref. 57. The direct spectroscopy of energies of electrons emitted by the two-particle source can be done in the same way as proposed in Ref.…”

Section: Two-particle Emittersupporting

confidence: 68%

Single-electron source: Adiabatic versus nonadiabatic emission

2013

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We investigate adiabatic and nonadiabatic emission of single particles into an edge state using an analytically solvable dynamical scattering matrix model of an on-demand source. We compare adiabatic and nonadiabatic emissions by considering two geometries: a collider geometry where two emitters are coupled to two different edge states and a series geometry where two emitters are coupled to the same edge state. Most effects observed for adiabatic emitters also occur for nonadiabatic emitters. In particular this applies to effects arising due to the overlap of wave packets colliding at a quantum point contact. Specifically we compare the Pauli peak (the fermionic analog of the bosonic Hong-Ou-Mandel dip) for the adiabatic and nonadiabatic collider and find them to be similar. In contrast we find a striking difference between the two operating conditions in the series geometry in which particles are emitted into the same edge state. Whereas the squared average charge current can be nullified for both operating conditions, the heat current can be made to vanish only with adiabatic emitters.

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Section: Two-particle Emittersupporting

confidence: 68%

Single-electron source: Adiabatic versus nonadiabatic emission

2013

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“…The experimental implementation of high-speed singleelectron sources not relying on an electron-electron interaction [5][6][7][8][9] opens up perspectives for the development of quantum coherent electronics (or, as it is often referred to, electron quantum optics 10 ), an emerging field aimed at creation [11][12][13][14][15] , manipulation [16][17][18][19][20][21] , and transportation 22,23 of single to few particles wave-packets in the condensed matter. To characterize the coherence properties of a single-electrons state the few protocols were already suggested.…”

Section: Introductionmentioning

confidence: 99%

Noise of a single-electron emitter

Moskalets

2013

Phys. Rev. B

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I analyze the correlation function of currents generated by the periodically driven quantum capacitor emitting single electrons and holes into the chiral waveguide. I compare adiabatic and non-adiabatic, transient working regimes of a single-electron emitter and find the striking difference between the correlation functions in two regimes. Quite generally for the system driven with frequency Ω the correlation function depends on two frequencies, ω and Ω − ω, where is an integer. For the emitter driven non-adiabatically the correlation functions for different are similar and almost symmetric in ω. While in the case of adiabatic drive the correlation functions for = 0 are highly asymmetric in ω and exceed significantly the one corresponding to = 0. Under optimal operating conditions the correlation function for odd is zero.

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“…The systematic deviations at higher frequencies are due to the slope in the plateaus, for which we chose the central value of the plateau, which systematically underestimates the plateau value because the nonequilibrium electrons in the excited states are more probable to tunnel back into the left contact, which reduces the CP current. 29 The dependence of the CP current on the rf power P is investigated in Figure 4b for V L -sweeps at f = 50 MHz and constant V R =−2.45 V. We cannot detect CP for powers below −8 dBm. With increasing power CP is limited to an increasing interval in V L .…”

Section: Nano Lettersmentioning

confidence: 98%

Gigahertz Quantized Charge Pumping in Bottom-Gate-Defined InAs Nanowire Quantum Dots

et al. 2015

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Semiconducting nanowires (NWs) are a versatile, highly tunable material platform at the heart of many new developments in nanoscale and quantum physics. Here, we demonstrate charge pumping, that is, the controlled transport of individual electrons through an InAs NW quantum dot (QD) device at frequencies up to 1.3 GHz. The QD is induced electrostatically in the NW by a series of local bottom gates in a state of the art device geometry. A periodic modulation of a single gate is enough to obtain a dc current proportional to the frequency of the modulation. The dc bias, the modulation amplitude and the gate voltages on the local gates can be used to control the number of charges conveyed per cycle. Charge pumping in InAs NWs is relevant not only in metrology as a current standard, but also opens up the opportunity to investigate a variety of exotic states of matter, for example, Majorana modes, by single electron spectroscopy and correlation experiments.

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Tunable Nonadiabatic Excitation in a Single-Electron Quantum Dot

Cited by 69 publications

References 17 publications

Single-electron source: Adiabatic versus nonadiabatic emission

Single-electron source: Adiabatic versus nonadiabatic emission

Noise of a single-electron emitter

Gigahertz Quantized Charge Pumping in Bottom-Gate-Defined InAs Nanowire Quantum Dots

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