Resonant transport and giant persistent currents in double-asymmetric rings

Hsueh, Wen–Jeng; Qiu, R.Z.; Chen, Chang-Hung

doi:10.1140/epjb/e2012-30988-9

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…The loop is placed under the action of a magnetic flux called Aharonov-Bohm (A-B) effect (Wu et al 2008;Kobayashi et al 2004;Xiong and Liang 2004). Also, giant persistent currents and Fano resonances have been studied in single and double asymmetric rings with and without scatterers on both arms or in presence of stubs around the loop (Hsueh et al 2013;Mrabti et al 2018;Voo and Chu 2005;Al-Wahsh et al 2007). Fano resonances have been obtained by tailoring the lengths of the wires constituting the system or the magnetic flux through the loop (Bulgakov et al 2006;Voo and Chu 2005;Al-Wahsh et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Bound states in the continuum and Fano resonances in photonic and plasmonic loop structures

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Bound states in the continuum and Fano resonances in photonic and plasmonic loop structures

et al. 2022

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“…These latter resonances are characterized by a peak followed by a dip in the transmission spectra as a consequence of a destructive interference of the waves, giving rise to an asymmetric line shape. These resonances have been the subject of intensive study from the theoretical and experimental point of view in single [47][48][49][50][51][52][53][54][55][56][57] and double [58][59][60][61][62][63][64][65] rings placed between two leads. In addition to Fano resonances, persistent currents are also studied in detail in A-B structures made of one or double rings [47,53,58] in presence of the magnetic flux and impurity or quantum dots in the arms of the ring.…”

Section: Introductionmentioning

confidence: 99%

Aharonov-Bohm-effect induced transparency and reflection in mesoscopic rings side coupled to a quantum wire

Mrabti

Labdouti

Mouadili

et al. 2020

Physica E: Low-dimensional Systems and Nanostructures

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We demonstrate analytically and numerically the possibility of existence of the analogues of electromagnetic induced transparency (EIT) and electromagnetic induced reflection (EIR) in a simple mesoscopic structure. The latter consists of a ring of length 2d attached vertically to two semi-infinite leads (waveguide) by a wire of length d 1 . The ring is threaded by a magnetic flux Φ, the so-called Aharonov-Bohm effect. The number of dangling wire-ring resonators attached at the same point can be increased to N. First, we demonstrate analytically that in the absence of the magnetic flux (Φ ¼ 0) and for particular values of d 1 , the structure may present some states that are confined in the ring and do not interact with the waveguide states. These trapped states fall in the continuum states of the two leads and therefore represent bound in continuum (BIC) states. These states are characterized by a zero width resonance (i.e., infinite life-time) in the transmission and reflection spectra. In presence of a weak magnetic flux (Φ 6 ¼ 0), the BIC states transform to EIT or EIR resonances for specific values of the lengths d 1 and d of the wire and the ring respectively. In addition to the numerical results, we have developed Taylor expansion calculations of the transmission and reflection coefficients around EIT and EIR resonances to show that the latter can be written following a Fano shape. In particular, we have deduced the Fano parameter q and the quality factor Q of these resonances as function of N and the flux Φ. We have found that Q decreases as function of Φ for both EIT and EIR resonances, whereas it increases (decreases) as function of N for EIT (EIR) resonances. These results show the possibility of tuning EIT and EIR resonances by means of the magnetic flux Φ and the number of dangling resonators N. The effect of temperature on EIT and EIR resonances is also considered through an analysis of the Landauer-Buttiker conductance formula obtained from transmission. The theoretical results are obtained within the framework of the Green's function method which enables us to deduce analytically the dispersion relation, transmission and reflection coefficients. These results may have important applications for electronic transport in mesoscopic systems such as filters and demultiplexers.

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A novel approach for generating giant electronic persistent currents in symmetric defect mesoscopic-ring networks

Yang

Deng

2017

Physics Letters A

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Resonant transport and giant persistent currents in double-asymmetric rings

Cited by 5 publications

References 26 publications

Bound states in the continuum and Fano resonances in photonic and plasmonic loop structures

Bound states in the continuum and Fano resonances in photonic and plasmonic loop structures

Aharonov-Bohm-effect induced transparency and reflection in mesoscopic rings side coupled to a quantum wire

A novel approach for generating giant electronic persistent currents in symmetric defect mesoscopic-ring networks

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