Klein tunneling through double barrier in ABC-trilayer graphene
- URL: http://arxiv.org/abs/2109.15100v1
- Date: Thu, 30 Sep 2021 13:06:13 GMT
- Title: Klein tunneling through double barrier in ABC-trilayer graphene
- Authors: Abderrahim El Mouhafid, Ahmed Jellal, Miloud Mekkaoui
- Abstract summary: Klein tunneling and conductance for Dirac fermions in ABC-stacked trilayer graphene (ABC-TLG) through symmetric and asymmetric double potential barriers are investigated.
Numerical results for our system show that the transport is sensitive to the height, the width and the distance between the two barriers.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Klein tunneling and conductance for Dirac fermions in ABC-stacked trilayer
graphene (ABC-TLG) through symmetric and asymmetric double potential barriers
are investigated using the two and six-band continuum model. Numerical results
for our system show that the transport is sensitive to the height, the width
and the distance between the two barriers. Klein paradox at normal incidence
and resonant features at non-normal incidence in the transmission result from
resonant electron states in the wells or hole states in the barriers and
strongly influence the ballistic conductance of the structures.
Related papers
- Influence of a squeezed prewell on tunneling properties and bound states in heterostructures [49.1574468325115]
A resonant tunneling effect of an extremely thin potential well on the transmission of charged particles is investigated.
The peak-to-valley ratio is shown to increase crucially with the squeezing of the well.
arXiv Detail & Related papers (2024-07-01T10:24:57Z) - Long-range interactions in Weyl dense atomic arrays protected from dissipation and disorder [41.94295877935867]
Long-range interactions are a key resource in many quantum phenomena and technologies.
We show how to design the polaritonic bands of these atomic metamaterials to feature a pair of frequency-isolated Weyl points.
These Weyl excitations can thus mediate interactions that are simultaneously long-range, due to their gapless nature; robust, due to the topological protection of Weyl points; and decoherence-free, due to their subradiant character.
arXiv Detail & Related papers (2024-06-18T20:15:16Z) - Chaos-Assisted Dynamical Tunneling in Flat Band Superwires [4.756578228865389]
Electrons can navigate along channels we call superwires, gently guided without brute force confinement.
Quantum properties of superwires give rise to elastic dynamical tunneling, linking disjoint regions of the corresponding classical phase space.
We quantify tunneling rates across various lattice configurations, and demonstrate the tunneling can be suppressed in a controlled fashion.
arXiv Detail & Related papers (2024-04-29T19:38:07Z) - Ab-Initio Calculations of Nonlinear Susceptibility and Multi-Phonon Mixing Processes in a 2DEG-Piezoelectric Heterostructure [41.94295877935867]
Solid-state elastic-wave phonons are a promising platform for a wide range of quantum information applications.
We propose a general architecture using piezoelectric-semiconductor heterostructures.
We show that, for this system, the strong third-order nonlinearity could enable single-phonon Kerr shift in an acoustic cavity.
arXiv Detail & Related papers (2024-02-01T03:34:41Z) - Emergence of non-Abelian SU(2) invariance in Abelian frustrated
fermionic ladders [37.69303106863453]
We consider a system of interacting spinless fermions on a two-leg triangular ladder with $pi/2$ magnetic flux per triangular plaquette.
Microscopically, the system exhibits a U(1) symmetry corresponding to the conservation of total fermionic charge, and a discrete $mathbbZ$ symmetry.
At the intersection of the three phases, the system features a critical point with an emergent SU(2) symmetry.
arXiv Detail & Related papers (2023-05-11T15:57:27Z) - Space-time resolved quantum field approach to Klein tunneling dynamics
across a finite barrier [0.0]
We find that no particle actually tunnels through a finite supercritical barrier, even in the case of resonant tunneling.
The transmission is instead mediated by modulations in pair production rates, at each edge of the barrier.
arXiv Detail & Related papers (2022-05-30T14:13:15Z) - Emergent intersubband-plasmon-polaritons of Dirac electrons under
one-dimensional superlattices [0.0]
We show that an extreme modulation of one-dimensional (1D) SL potentials in monolayer graphene deforms the underlying Dirac band dispersion.
This results in emergent intersubband polaritonic responses in optical conductivity.
Our study opens up an avenue for exploring emergent polaritons in two-dimensional materials with gate-tunable electronic band structures.
arXiv Detail & Related papers (2022-03-25T18:18:27Z) - Probing defect densities at the edges and inside Josephson junctions of
superconducting qubits [58.720142291102135]
Tunneling defects in disordered materials form spurious two-level systems.
For superconducting qubits, defects in tunnel barriers of submicrometer-sized Josephson junctions couple strongest to the qubit.
We investigate whether defects appear predominantly at the edges or deep within the amorphous tunnel barrier of a junction.
arXiv Detail & Related papers (2021-08-14T15:01:35Z) - Tunneling of Electrons in Graphene via Double Triangular Barrier in
External Fields [0.0]
We study the transmission probability of Dirac fermions in graphene scattered by a triangular double barrier potential.
The triangular barrier electrostatic field was found to play a key role in controlling the peak of tunneling resistance.
arXiv Detail & Related papers (2021-07-30T17:35:36Z) - Transport Properties in Gapped Bilayer Graphene [0.0]
We investigate transport properties through a rectangular potential barrier in AB-stacked bilayer graphene (AB-BLG)
For two-band model and at normal incidence, we find extra resonances appearing in transmission compared to biased AB-BLG.
Regarding four band model, we find that the gap suppresses transmission in an energy range by showing some behaviors look like "Mexican hats"
arXiv Detail & Related papers (2021-01-23T10:24:51Z) - Universal non-adiabatic control of small-gap superconducting qubits [47.187609203210705]
We introduce a superconducting composite qubit formed from two capacitively coupled transmon qubits.
We control this low-frequency CQB using solely baseband pulses, non-adiabatic transitions, and coherent Landau-Zener interference.
This work demonstrates that universal non-adiabatic control of low-frequency qubits is feasible using solely baseband pulses.
arXiv Detail & Related papers (2020-03-29T22:48:34Z)
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.