Manipulation of resonances in an open three-terminal interferometer with an embedded quantum dot

Joe, Yong S.; Hedin, Eric; Satanin, A. M.

doi:10.1103/physrevb.76.085419

Cited by 22 publications

(16 citation statements)

References 21 publications

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“…Hence, the general incoming and outgoing wave functions in the leads from the solution of Eq. (7) may be written as [25,26] ψ n = e inθ + re −inθ , n 0,…”

Section: Theoretical Model and Calculationsmentioning

confidence: 99%

Electron transport through asymmetric DNA molecules

2010

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“…Hence, the general incoming and outgoing wave functions in the leads from the solution of Eq. (7) may be written as [25,26] ψ n = e inθ + re −inθ , n 0,…”

Section: Theoretical Model and Calculationsmentioning

confidence: 99%

Electron transport through asymmetric DNA molecules

2010

Self Cite

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“…Consider an extension of the two-terminal continuum model described in section 3.1 to the case of three terminals. In a mesoscopic system or in the absence of magnetic fields, such devices have been considered by several groups (see [134][135][136][137][138][139][140][141][142][143][144]). An illustration of the three-terminal set-up is given in figure 7.…”

Section: Three-terminal Devicesmentioning

confidence: 99%

Magnetoresistance of nanoscale molecular devices based on Aharonov–Bohm interferometry

Hod

Baer

Rabani

2008

J. Phys.: Condens. Matter

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Control of conductance in molecular junctions is of key importance in the growing field of molecular electronics. The current in these junctions is often controlled by an electric gate designed to shift conductance peaks into the low bias regime. Magnetic fields, on the other hand, have rarely been used due to the small magnetic flux captured by molecular conductors (an exception is the Kondo effect in single-molecule transistors). This is in contrast to a related field, electronic transport through mesoscopic devices, where considerable activity with magnetic fields has led to a rich description of transport. The scarcity of experimental activity is due to the belief that significant magnetic response is obtained only when the magnetic flux is of the order of the quantum flux, while attaining such a flux for molecular and nanoscale devices requires unrealistic magnetic fields. Here we review recent theoretical work regarding the essential physical requirements necessary for the construction of nanometer-scale magnetoresistance devices based on an Aharonov-Bohm molecular interferometer. We show that control of the conductance properties using small fractions of a magnetic flux can be achieved by carefully adjusting the lifetime of the conducting electrons through a pre-selected single state that is well separated from other states due to quantum confinement effects. Using a simple analytical model and more elaborate atomistic calculations we demonstrate that magnetic fields which give rise to a magnetic flux comparable to 10(-3) of the quantum flux can be used to switch a class of different molecular and nanometer rings, ranging from quantum corrals, carbon nanotubes and even a molecular ring composed of polyconjugated aromatic materials. The unique characteristics of the magnetic field as a gate is further discussed and demonstrated in two different directions. First, a three-terminal molecular router devices that can function as a parallel logic gate, processing two logic operations simultaneously, is presented. Second, the role of inelastic effects arising from electron-phonon couplings on the magnetoresistance properties is analyzed. We show that a remarkable difference between electric and magnetic gating is also revealed when inelastic effects become significant. The inelastic broadening of response curves to electric gates is replaced by a narrowing of magnetoconductance peaks, thereby enhancing the sensitivity of the device.

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“…Each pole is connected with a resonance level (or a quasibound state). According to the Breit-Wigner formalism, the real part of a pole presents the energy of a quasibound state, and the imaginary part is related to the lifetime of the resonance level [20,21]. In Fig.…”

Section: B Scattering In Subspace With All Spin Downmentioning

confidence: 99%

Coherently manipulating flying qubits in a quantum wire with a magnetic impurity

Zhou

2010

Eur. Phys. J. B

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We study the effect of a magnetic impurity with spin-half on a single propagating electron in a onedimensional model system via the tight-binding approach. Due to the spin-dependent interaction, the scattering channel for the flying qubit is split, and its transmission spectrum is obtained. It is found that, the spin orientation of the impurity plays the role as a spin state filter for a flying qubit.

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Manipulation of resonances in an open three-terminal interferometer with an embedded quantum dot

Cited by 22 publications

References 21 publications

Electron transport through asymmetric DNA molecules

Electron transport through asymmetric DNA molecules

Magnetoresistance of nanoscale molecular devices based on Aharonov–Bohm interferometry

Coherently manipulating flying qubits in a quantum wire with a magnetic impurity

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