Fano-effect and negative differential conductance in asymmetric parallel coupled quantum dots

Chand, Shyam; Moudgil, R. K.; Ahluwalia, P. K.

doi:10.1016/j.physb.2009.08.066

Cited by 11 publications

(3 citation statements)

References 42 publications

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“…Fano effect, a nice illustration of quantum interference phenomena has been explored for varied configuration under transition from series to symmetric parallel configuration by Ladron de Guevara [7], Feng Chi [3] etc. For similar transition Fano effect without flux [5,6] and with flux [12,13] has also been reported.…”

Section: Introductionsupporting

confidence: 73%

“…where, ( With the help of NEGF formalism and EOM method [5,14] the formula for current and transmission coefficient are derived in terms of Green Functions (GF) of QDs are obtained as:…”

Section: Model Hamiltonian and Formalismmentioning

confidence: 99%

“…Research in this field remained focused on generic coupled quantum dot (CQD) system in which two or more quantum dots can be coupled in the form of artificial molecule. The CQD system offers very rich transport phenomena which can be investigated for series [1,2], parallel [3,4] and for asymmetric transition of the CQD system from series to parallel configuration [3,[5][6][7]. Theoretical and experimental work on the electron transport through this system for varied configuration has revealed various effects such as Kondo effect [8,9], interference effect [10] and Coulomb blockade effect [11].…”

Section: Introductionmentioning

confidence: 99%

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Fano effect dominance over Coulomb blockade in transport properties of parallel coupled quantum dot system

Brogi

Chand²,

Ahluwalia

2015

AIP Conference Proceedings

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Theoretical study of the Coulomb blockade effect on transport properties (Transmission Probability and I-V characteristics) for varied configuration of coupled quantum dot system has been studied by using Non Equilibrium Green Function(NEGF) formalism and Equation of Motion(EOM) method in the presence of magnetic flux. The self consistent approach and intra-dot Coulomb interaction is being taken into account. As the key parameters of the coupled quantum dot system such as dot-lead coupling, inter-dot tunneling and magnetic flux threading through the system can be tuned, the effect of asymmetry parameter and magnetic flux on this tuning is being explored in Coulomb blockade regime. The presence of the Coulomb blockade due to on-dot Coulomb interaction decreases the width of transmission peak at energy level + and by adjusting the magnetic flux the swapping effect in the Fano peaks in asymmetric and symmetric parallel configuration sustains despite strong Coulomb blockade effect.

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Section: Introductionsupporting

confidence: 73%

“…where, ( With the help of NEGF formalism and EOM method [5,14] the formula for current and transmission coefficient are derived in terms of Green Functions (GF) of QDs are obtained as:…”

Section: Model Hamiltonian and Formalismmentioning

confidence: 99%