Gap-tunable of Tunneling Time in Graphene Magnetic Barrier
- URL: http://arxiv.org/abs/2103.16600v1
- Date: Tue, 30 Mar 2021 18:16:39 GMT
- Title: Gap-tunable of Tunneling Time in Graphene Magnetic Barrier
- Authors: Youssef Fattasse, Miloud Mekkaoui, Ahmed Jellal, Abdelhadi Bahaoui
- Abstract summary: We study the tunneling time of Dirac fermions in graphene magnetic barrier through an electrostatic potential and a mass term.
This latter generates an energy gap in the spectrum and therefore affects the proprieties of tunneling of the system.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We study the tunneling time of Dirac fermions in graphene magnetic barrier
through an electrostatic potential and a mass term. This latter generates an
energy gap in the spectrum and therefore affects the proprieties of tunneling
of the system. For clarification, we first start by deriving the eigenspinors
solutions of Dirac equation and second connect them to the incident, reflected
and transmitted beam waves. This connection allows us to obtain the
corresponding phases shifts and consequently compute the group delay time in
transmission and reflection. Our numerical results show that the group delay
time depends strongly on the energy gap in the tunneling process through single
barrier. Moreover, we find that the group approaches unity at some critical
value of the energy gap and becomes independent to the strengths of involved
physical parameters.
Related papers
- Effect of strain on tunneling time in graphene magnetic barrier [0.0]
We show that the gate voltage and strain have the ability to change the group delay from subluminality to superluminality.
This may have significant uses in high-speed graphene-based nanoelectronics.
arXiv Detail & Related papers (2022-08-30T16:52:10Z) - Wave manipulation via delay-engineered periodic potentials [55.41644538483948]
We discuss the semi-classical transverse trapping of waves by means of an inhomogeneous gauge field.
We show that, due to the Kapitza effect, an effective potential proportional to the square of the transverse derivative of the delay arises.
arXiv Detail & Related papers (2022-07-27T11:45:32Z) - Numerical simulations of quantum clock for measuring tunneling times [0.0]
We numerically study two methods of measuring tunneling times using a quantum clock.
In the conventional method using the Larmor clock, we show that the Larmor tunneling time can be shorter for higher tunneling barriers.
In the second method, we study the probability of a spin-flip of a particle when it is transmitted through a potential barrier.
arXiv Detail & Related papers (2022-07-26T18:18:39Z) - Instantaneous tunneling of relativistic massive spin-0 particles [0.0]
A non-relativistic time-of-arrival operator predicted that tunneling time is instantaneous.
This raises the question on whether instantaneous tunneling time is a consequence of using a non-relativistic theory.
arXiv Detail & Related papers (2022-07-19T03:17:45Z) - Time-dependent Interactions in Tunnelling Dynamics [0.5874142059884518]
Tunnelling of a particle through a potential barrier is investigated in the presence of a time-dependent perturbation.
The calculation of the probability density inside the barrier proves that the tunnelling dynamics is determined.
A new method of estimating the tunnelling time by energy experimental measuring is proposed.
arXiv Detail & Related papers (2022-02-14T18:00:10Z) - Aharonov-Bohm effect on the generalized Duffin-Kemmer-Petiau oscillator
in the Som-Raychaudhuri space-time [30.03335724329084]
The effect from the parameters of space-time, the frequency of oscillator, the Cornell potential and the magnetic flux on the energy eigenvalues have been analyzed.
We find an analogs effect for the bound states from the Aharonov-Bohm effect in our considered system.
arXiv Detail & Related papers (2021-06-23T06:48:42Z) - Quantum interference in strong-field ionization by a linearly polarized
laser pulse, and its relevance to tunnel exit time and momentum [0.0]
We investigate the liberation of an atomic electron by a linearly polarized single-cycle near-infrared laser pulse having a peak intensity that ensures tunneling.
Based on phase space analysis and energy distribution in the instantaneous potential, we reveal the importance of quantum interference between tunneling and over-the-barrier pathways of escape.
arXiv Detail & Related papers (2021-03-23T17:20:59Z) - Chemical tuning of spin clock transitions in molecular monomers based on
nuclear spin-free Ni(II) [52.259804540075514]
We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes.
The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments.
The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
arXiv Detail & Related papers (2021-03-04T13:31:40Z) - New approach to describe two coupled spins in a variable magnetic field [55.41644538483948]
We describe the evolution of two spins coupled by hyperfine interaction in an external time-dependent magnetic field.
We modify the time-dependent Schr"odinger equation through a change of representation.
The solution is highly simplified when an adiabatically varying magnetic field perturbs the system.
arXiv Detail & Related papers (2020-11-23T17:29:31Z) - Probing the coherence of solid-state qubits at avoided crossings [51.805457601192614]
We study the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings.
The proposed theoretical approach paves the way to designing the coherence properties of spin qubits from first principles.
arXiv Detail & Related papers (2020-10-21T15:37:59Z) - Zitterbewegung and Klein-tunneling phenomena for transient quantum waves [77.34726150561087]
We show that the Zitterbewegung effect manifests itself as a series of quantum beats of the particle density in the long-time limit.
We also find a time-domain where the particle density of the point source is governed by the propagation of a main wavefront.
The relative positions of these wavefronts are used to investigate the time-delay of quantum waves in the Klein-tunneling regime.
arXiv Detail & Related papers (2020-03-09T21:27:02Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.