Quenching effect of oscillating potential on anisotropic resonant transmission through a phosphorene electrostatic barrier

Biswas, Rudro R.; Sinha, Chittaranjan

doi:10.1038/s41598-021-82323-z

“…These resonances can be modulated by the electrostatic potential, the with of the barrier or with a magnetic field. Similar behavior can be found when a k • p Hamiltonian is used [41]. The present results where obtained with the help of the tight-binding Hamiltonian given by equation ( 1), which is a well established Hamiltonian [14].…”

Section: Resultssupporting

confidence: 79%

Electronic cloaking of confined states in phosphorene junctions

Molina-Valdovinos

¹

,

Lamas-Martínez

²

,

Briones-Torres

³

et al. 2022

J. Phys.: Condens. Matter

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We study the electronic transport of armchair and zigzag gated phosphorene junctions. We find confined states for both direction-dependent phosphorene junctions. In the case of armchair junctions confined states are reflected in the transmission properties as Fabry-Pérot resonances at normal and oblique incidence. In the case of zigzag junctions confined states are invisible at normal incidence, resulting in a null transmission. At oblique incidence Fabry-Pérot resonances are presented in the transmission as in the case of armchair junctions. This invisibility or electronic cloaking is related to the highly direction-dependent pseudospin texture of the charge carriers in phosphorene. Electronic cloaking is also manifested as a series of singular peaks in the conductance and as inverted peaks in the Seebeck coefficient. The characteristics of electronic cloaking are also susceptible to the modulation of the phosphorene bandgap and an external magnetic field. So, electronic cloaking in phosphorene junctions in principle could be tested through transport, thermoelectric or magnetotransport measurements.

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“…This is indeed true in the stationary case, but in the dynamic case, the situation is much more complicated. Some of these effects have been observed in recent research [21,27].…”

Section: Introductionmentioning

confidence: 66%

“…In particular, it has been shown that 100% reflection occurs in certain cases. This conduct is related to Fano resonances [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 98%

Multiple Fano Resonances in Dynamic Resonant Tunneling Processes

Zangwill

¹

,

Granot

²

2023

Applied Sciences

2

0

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The existence of Fano resonances in dynamic resonant tunneling (RT) systems has been investigated. Fano resonances are characterized by the appearance of a 100% reflection coefficient in proximity to a high transmission coefficient. For a Fano resonance to appear, a bound state must exist. On the other hand, a resonant tunneling process is characterized by a high transmission and the existence of a quasi-bound state (QBS) instead of a bound one. It has been shown that, by narrowing the width of the barrier, the resonance energy of the QBS gradually decreases and eventually turns into a bound state. Consequently, in a dynamic RT process, there are two scenarios: either a bound state exists, in which case, Fano resonances exist for any barrier width, or a QBS exists, and the barrier should be narrow enough for the Fano resonance to appear. In both cases, the incoming particle’s frequency must be lower than the oscillating well’s frequency. In this work, these resonances are investigated in detail, and both exactly numerically and approximated analytical expressions are derived for both the weak and strong oscillating amplitude regimes. One of the conclusions is that, when the oscillating frequency is low enough, multiple Fano resonances can appear by varying the barrier’s width. Since these resonances are very sharp and zero transmission can easily be detected, this property can be used as a very accurate method for measuring the barrier’s width, even when the particle’s de-Broglie wavelength is much larger than the barrier’s width.

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“…As far as we know, there is no evidence of the cloaking effect when alternative Hamiltonians are used. For instance, Biswas et al [27] used a k • p Hamiltonian, finding Fabry-Pérot resonances at normal incidence for ZZ-GPJs. In this context, we hope that our findings motivate experimentalists to corroborate electronic cloaking and theoreticians to study the validity of the different phosphorene Hamiltonians.…”

Section: S7 and S9mentioning

confidence: 99%

Electronic cloaking of confined states in phosphorene junctions

Molina-Valdovinos,

Lamas-Martínez,

Briones-Torres

et al. 2021

Preprint

0

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We study the electronic transport of armchair and zigzag gated phosphorene junctions. We find confined states for both direction-dependent phosphorene junctions.In the case of armchair junctions confined states are reflected in the transmission properties as Fabry-Pérot resonances at normal and oblique incidence. In the case of zigzag junctions confined states are invisible at normal incidence, resulting in a null transmission. At oblique incidence Fabry-Pérot resonances are presented in the transmission as in the case of armchair junctions. This invisibility or electronic cloaking is related to the highly direction-dependent pseudospin texture of the charge carriers in phosphorene. Electronic cloaking is also manifested as a series of singular peaks in the conductance and as inverted peaks in the Seebeck coefficient. The characteristics of electronic cloaking are also susceptible to the modulation of the phosphorene bandgap and an external magnetic field. So, electronic cloaking in phosphorene junctions in principle could be tested through transport, thermoelectric or magnetotransport measurements.Cloaking effect consists in making objects invisible to radiation, acoustic waves, matter waves, heat and charge fluxes, among others [1][2][3][4]. The typical cloaking effect is based on guiding plane waves around an object. The effect also refers to hiding an object in space.Cloaking effect is a phenomenon that can have a plethora of applications such as mantle cloaking, antennas, invisible sensors that do not perturb the field that they measure, etc. [1].With the arrival of 2D materials, in particular graphene, there were reports of the cloaking effect in bilayer graphene junctions [5][6][7] and graphene nanoribbons [8]. Experimental evi- *

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Quenching effect of oscillating potential on anisotropic resonant transmission through a phosphorene electrostatic barrier

Cited by 11 publications

References 45 publications

Electronic cloaking of confined states in phosphorene junctions

Electronic cloaking of confined states in phosphorene junctions

Multiple Fano Resonances in Dynamic Resonant Tunneling Processes

Electronic cloaking of confined states in phosphorene junctions

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