Spin orbit splitting of the photon induced Fano resonance in an oscillating graphene electrostatic barrier

Biswas, Rudro R.; Sinha, Chittaranjan

doi:10.1063/1.4869846

Journal of Applied Physics

2014

DOI: 10.1063/1.4869846

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Spin orbit splitting of the photon induced Fano resonance in an oscillating graphene electrostatic barrier

Rudro R. Biswas¹,

Chittaranjan Sinha

Abstract: Abstract:We investigate theoretically the effect of a time dependent oscillating potential on the

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Cited by 4 publications

(2 citation statements)

References 59 publications

(66 reference statements)

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“…This effect is related to photon-assisted tunneling (PAT) [15]. The study of the quantum transport properties in 2D material systems under time-periodic potential is an important subject, because of the increasing number of their applications in electronic and optical devices [16][17][18][19][20][21][22][23][24][25]. Li and coworkers [16] investigated the transmission properties of a topological insulator under a gate bias voltage and a time-dependent potential.…”

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Electron scattering in silicene quantum dot with a time-periodic potential

Sattari¹,

Aslanzadeh²

2021

EPL

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We investigate the scattering problem for electrons in a circular silicene quantum dot with a time-periodic potential and intrinsic spin-orbit coupling. Our results demonstrate that the scattering coefficient depends on the radius of the quantum dot (R), the amplitude , and the frequency of the time-periodic potential as well as the order of the sideband. For the zero bias, unlike the finite bias, the scattering coefficient is independent of the sign of n for the n-th sideband. We also find that the scattering increases with R. Also, for smaller values of R, there is not any scattering in the silicene quantum dot for both the zero bias and the finite bias. For n > 1, the scattering is significant only for the small frequency values. Interestingly, a circular silicene quantum dot can temporarily trap electrons.

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Electron scattering in silicene quantum dot with a time-periodic potential

Sattari¹,

Aslanzadeh²

2021

EPL

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“…In the case of a periodically driven quantum systems, the inelastic scattering channels open up due to the exchange of photons between the tunnelling electron and the oscillating potential. Fano type resonances [39][40][41][42][43] are likely to appear in this context due to transitions between the Floquet sideband states and the bound states both for the δ-function as well as finite width graphene magnetic barriers.…”

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Electron transmission through a periodically driven graphene magnetic barrier

Biswas¹,

Maiti²,

Mukhopadhyay³

et al. 2017

Physics Letters A

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The kinetic transport of electrons through graphene magnetic barriers is studied theoretically in presence of an external time harmonic scalar potential. The transmission coefficients are calculated in the framework of the non-perturbative Floquet theory using transfer matrix method. The time dependent scalar potential is found to suppress the usual Fabry-Perot oscillations occurring in the transmission through a constant vector potential barrier (corresponding to two oppositely directed δ-function magnetic barriers). Two types of asymmetric Fano resonances (FR) are noted and are discussed for the narrow barrier structure. One of them arises due to the oscillatory mode while the other due to the evanescent mode of the electron wave inside the barrier. In contrast, the oscillating field favours the transmission for rectangular magnetic barrier structure and also exhibits the FR due to the presence of bound state inside the barrier. The characteristic Fano line shape can be tuned by varying the amplitude of the oscillating potential. The detection of such FRs' offers an efficient tool for the identification of the quasi-bound and evanescent extended states inside the barrier not reported in the literature so far, for the case of graphene magnetic barrier structures.

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Spin polarisation using gate voltage through a Rashba barrier in graphene

Wu¹

2016

J. Phys. D: Appl. Phys.

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Gate-tunable spin-resolved scattering through a Rashba spin–orbit (SO) coupling graphene barrier is considered theoretically by using a mode-matching method. In this structure, we investigate the dependence of the tunnelling transmission probability on the spin orientation of the incident electron. It is found that the difference of the transmission probability for opposite spin orientations exhibits considerable incident-angle-dependent features when both gate voltage and Rashba SO coupling in the barrier region are present. The difference is adjustable by the gate voltage. More specifically, we find that the sign of spin polarisation of conductance can switch from positive to negative by adjusting the electric potential at any Rashba SO coupling. These results can provide an efficient way to design graphene spintronic devices without the need for ferromagnets.

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Spin orbit splitting of the photon induced Fano resonance in an oscillating graphene electrostatic barrier

Abstract: Abstract:We investigate theoretically the effect of a time dependent oscillating potential on the

Cited by 4 publications

References 59 publications

Electron scattering in silicene quantum dot with a time-periodic potential

Electron scattering in silicene quantum dot with a time-periodic potential

Electron transmission through a periodically driven graphene magnetic barrier

Spin polarisation using gate voltage through a Rashba barrier in graphene

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