Time-dependent transport of symmetric Λ-type coupled triple quantum dots: competition between coherent destruction of tunneling and Fano resonance

Duan, Suqing; Zhang, Wei; Xie, Wanyuan; Ma, Yurong; Chu, Weidong

doi:10.1088/1367-2630/11/1/013037

Cited by 13 publications

(6 citation statements)

References 37 publications

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“…Our results are a contribution in ongoing efforts to control electron transport in few electron nanoelectromechanical quantum dot arrangements. They should be relevant, for example, in Molecular Electronics, or in the area of quantum information circuits where these systems have been considered as spin entanglers [35] or quantum switches [36].…”

Section: Discussionmentioning

confidence: 99%

Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles

Villavicencio,

Maldonado,

Cota

et al. 2011

Preprint

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The dynamics of electrons in ac driven double quantum dots have been extensively analyzed by means of Floquet theory. In these systems, coherent destruction of tunneling has been shown to occur for certain ac field parameters. In the present work we analyze, by means of Floquet theory, the electron dynamics of a triple quantum dot in series attached to electric contacts, where the central dot position oscillates. In particular, we analyze the quasienergy spectrum of this ac driven nanoelectromechanical system, as a function of the intensity and frequency of the ac field and of external dc voltages. For strong driving fields, we derive, by means of perturbation theory, analytical expressions for the quasienergies of the driven oscillator system. From this analysis we discuss the conditions for coherent destruction of tunneling (CDT) to occur as a function of detuning and field parameters. For zero detuning, and from the invariance of the Floquet Hamiltonian under a generalized parity transformation, we find analytical expressions describing the symmetry properties of the Fourier components of the Floquet states under such transformation. By using these expressions, we show that in the vicinity of the CDT condition, the quasienergy spectrum exhibits exact crossings which can be characterized by the parity properties of the corresponding eigenvectors.

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Section: Discussionmentioning

confidence: 99%

Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles

Villavicencio,

Maldonado,

Cota

et al. 2011

Preprint

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show abstract

“…Although the primitive interest for such studies is theoretical and various physical applications of the problem have been theoretically explored earlier in quantum heterostructures such as controlling electron transport in few-electron quantum dots to fabricate a quantum switch, [30] production of currents in an ac-driven quantum dot, [31] absorption and the nonlinear sideband generation, [32] and low-frequency dynamics, [33] these results may be experimentally observable. Floquet bands and quasi-energies were interpreted by the spectroscopic techniques such as pump-probe experiments and time and angle-resolved photoemission spectroscopy (Tr-ARPES) in graphene [34] and in monolayer transition metal dichalcogenides (TMD).…”

Section: Introductionmentioning

confidence: 99%

Non-perturbative multiphoton excitation studies in an excitonic coupled quantum well system using high-intensity THz laser fields

Gambhir

Prasad

2019

Chinese Phys. B

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Multiphoton excitations and nonlinear optical properties of exciton states in GaAs/Al x Ga1−x As coupled quantum well structure have been theoretically investigated under the influence of a time-varying high-intensity terahertz (THz) laser field. Non-perturbative Floquet theory is employed to solve the time-dependent equation of motion for the laser-driven excitonic quantum well system. The response to the field parameters, such as intensity and frequency of the laser electric field on the state populations, can be used in various optical semiconductor device applications, such as photodetectors, sensors, all-optical switches, and terahertz emitters.

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“…Quantum transport in nanostructures has attracted much attention in the recent decades, because it deepens our understanding of fundamental quantum physics and has various applications. Many interesting phenomena have been found, such as the Coulomb blockade, [1] the Fano effect, [2,3] and the Kondo effect. [4] People have found an interesting relation between the optical and the transport properties.…”

Section: Introductionmentioning

confidence: 99%

Spin-polarized current in double quantum dots

Li¹,

Duan²

2012

Chinese Phys. B

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We analyze the transport through asymmetric double quantum dots with an inhomogeneous Zeeman splitting in the presence of crossed dc and ac magnetic fields. A strong spin-polarized current can be obtained by changing the dc magnetic field. It is mainly due to the resonant tunnelling. But for the ferromagnetic right electrode, the electron spin resonance also plays an important role in transport. We show that the double quantum dots with three-level mixing under crossed dc and ac magnetic fields can act not only as a bipolar spin filter but also as a spin inverter under suitable conditions.

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Time-dependent transport of symmetric Λ-type coupled triple quantum dots: competition between coherent destruction of tunneling and Fano resonance

Cited by 13 publications

References 37 publications

Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles

Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles

Non-perturbative multiphoton excitation studies in an excitonic coupled quantum well system using high-intensity THz laser fields

Spin-polarized current in double quantum dots

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