Partial swapping of Fano resonance and bound states in continuum in a correlated double-quantum-dot system

Rajput, Gagan; Ahluwalia, P. K.; Sharma, K. C.

doi:10.1209/0295-5075/94/17003

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Thus, we expect that in this kind of symmetric configuration, independently of other effects such as electron correlations, BICs should exist and produce an enhancement of the figure of merit if the symmetry of the potentials is slightly broken by external manipulation. Indeed, there are previous studies showing that electron-electron interactions do not affect the existence of BICs in similar systems, albeit much simpler in geometry [50][51][52], so we foresee that our results are robust to this respect. We expect that our work will stimulate the search of thermoelectric devices in which quantum interference effects be exploited to improve the thermoelectric efficiency of nanoscale systems.…”

Section: Summary and Final Remarkssupporting

confidence: 58%

Enhancement of thermoelectric efficiency by quantum interference effects in trilayer silicene flakes

Cortés

Rosales

Chico

et al. 2016

J. Phys.: Condens. Matter

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In recent years, the enhancement of thermoelectric efficiencies has been accomplished in nanoscale systems by making use of quantum effects. We exploit the presence of quantum interference phenomena such as bound states in the continuum and Fano antiresonances in trilayer silicene flakes to produce sharp changes in the electronic transmission of the system. By applying symmetric gate voltages the thermoelectric properties can be tuned and, for particular flake lengths, a great enhancement of the figure of merit can be achieved. We show that the most favorable configurations are those in which the electronic transmission is dominated by the coupling of bound states to the continuum, tuned by an external gate.

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Section: Summary and Final Remarkssupporting

confidence: 58%

Enhancement of thermoelectric efficiency by quantum interference effects in trilayer silicene flakes

Cortés

Rosales

Chico

et al. 2016

J. Phys.: Condens. Matter

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“…In contrast, the results obtained at low temperatures are associated with charge fluctuations in the QD1 "induced" by the variation of the quantum tunneling between the QD1 and the conduction channel (hybridization V QD1 ). In this case, the quasi-BIC associated with the enhancement of the thermoelectric efficiency is linked to asymmetries in the coupling between the QDs and the conduction channel, which originates a Fano character for the resonances, analogously to the described by Rajput et al [67].…”

Section: Bics Linked To the Enhancing Process Of Zt : High Temperatur...mentioning

confidence: 68%

“…To check the appearance of BICs, at low temperatures, we introduce an asymmetry in the hybridizations and maintain fixed the hybridization V QD2 and vary V QD1 . As demonstrated in reference [67], in the DQD geometry, the formation of BICs results from an interplay of correlation effects and asymmetries in dot-lead couplings.…”

Section: Bics Linked To the Enhancing Process Of Zt : Low Temperature...mentioning

confidence: 87%

Universality and the thermoelectric transport properties of a double quantum dot system: Seeking for conditions that improve the thermoelectric efficiency

Cortes-Santamaria¹,

Landazabal-Rodríguez²,

Silva-Valencia³

et al. 2023

Preprint

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Employing universal relations for the Onsager coefficients in the linear regime at the symmetric point of the single impurity Anderson model, we calculate the conditions under which the quantum scattering phase shift should satisfy to produce the asymptotic Carnot's limit for the thermoelectric efficiency. We show that a single quantum dot connected by metallic leads at the Kondo regime cannot achieve the conditions that cause the best thermoelectric efficiency. We study a system of serial double quantum dots without inter-dot correlations. We show that maintaining one dot in the electron-hole symmetric point makes it possible to obtain conditions for the quantum phase shift linked to charge fluctuations in the other quantum dot that satisfy the conditions associated with enhancing the thermoelectric efficiency.We also discuss the presence of bound states in the continuum (BICs) and quasi-BICs associated with the quantum scattering interference process that improves thermoelectric efficiency. We identify two types of quasi-BICs that occur at low and high temperatures: The first is associated with single Fano resonances, and the last is with several Fano processes. We also discussed possible temperature values and conditions that could be linked with the experimental realization of our results.

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“…Interestingly, controlling the size of one of the quantum dots makes the electron flow or get trapped inside the dots. BICs were also found in parallel doublequantum-dot systems [13] and they were found to be robust even if electron-electron interaction is taken into account [14]. Recently, González et al have demonstrated that not only quantum dots based on semiconductor materials but also on graphene can support BICs [15].…”

mentioning

confidence: 99%

Bound states in the continuum driven by AC fields

González-Santander

Orellana

Domı́nguez-Adame

2013

EPL

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We report the formation of bound states in the continuum driven by AC fields. This system consists of a quantum ring connected to two leads. An AC side-gate voltage controls the interference pattern of the electrons passing through the system. We model the system by two sites in parallel connected to two semi-infinite lattices. The energy of these sites change harmonically with time. We obtain the transmission probability and the local density of states at the ring sites as a function of the parameters that define the system. The transmission probability displays a Fano profile when the energy of the incoming electron matches the driving frequency. Correspondingly, the local density of states presents a narrow peak that approaches a δ function in the weak coupling limit. We attribute these features to the presence of bound states in the continuum.

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Partial swapping of Fano resonance and bound states in continuum in a correlated double-quantum-dot system

Cited by 8 publications

References 21 publications

Enhancement of thermoelectric efficiency by quantum interference effects in trilayer silicene flakes

Enhancement of thermoelectric efficiency by quantum interference effects in trilayer silicene flakes

Universality and the thermoelectric transport properties of a double quantum dot system: Seeking for conditions that improve the thermoelectric efficiency

Bound states in the continuum driven by AC fields

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