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

• Symmetry-protected topology and deconfined solitons in a multi-link $\mathbb{Z}_2$ gauge theory [45.88028371034407]
  We study a $mathbbZ$ lattice gauge theory defined on a multi-graph with links that can be visualized as great circles of a spherical shell.<n>We show that this leads to state-dependent tunneling amplitudes underlying a phenomenon analogous to the Peierls instability.<n>By performining a detailed analysis based on matrix product states, we prove that charge deconfinement emerges as a consequence of charge-fractionalization.
  arXiv  Detail & Related papers  (2026-03-02T22:59:25Z)
• Perfect transmission of a Dirac particle in one-dimension double square barrier [4.634880442029712]
  Dirac particles can undergo perfect transmission through a sufficiently high potential barrier in the Klein zone.<n>The perfect Klein tunneling is similar to the non-relativistic resonant transmission which occurs only when the kinetic energy exceeds the barrier.<n>We show that for the relativistic double-barrier model the perfect-transmission curve can pass continuously from the above-barrier zone to the Klein zone.
  arXiv  Detail & Related papers  (2026-02-27T03:35:32Z)
• Quantum Hall Effect at 0.002T [46.680073344221626]
  We demonstrate a significant reduction in external inhomogeneity using a double-layer graphene architecture separated by an ultra-thin hexagonal boron nitride layer.<n>Shubnikov de-Haas oscillations emerge at magnetic fields below 1 mT, while integer quantum Hall features are observed at 0.002T.<n>These results demonstrate the platform's suitability for investigating strongly correlated electronic phases in graphene-based heterostructures.
  arXiv  Detail & Related papers  (2026-01-22T14:40:33Z)
• Escaping AB caging via Floquet engineering: photo-induced long-range interference in an all-band-flat model [0.0]
  We show that periodic driving in the high-frequency regime transforms the all-flat-band diamond chain into one featuring two tunable quasi-flat bands.<n>The interplay between lattice geometry and the symmetries of the driven system gives rise to drive-induced tunneling processes.
  arXiv  Detail & Related papers  (2025-11-25T12:35:21Z)
• Streamline controlled rectification of supercurrent in thin-film asymmetric weak links [39.58317527488534]
  We study the supercurrent diode effect (SDE) in mesoscopic superconducting weak links formed by asymmetric Dayem bridges.<n>By implementing controlled geometric defects at the junction between the constriction and superconducting leads, we induce current crowding and disrupt spatial symmetry.<n>Our findings advocate for mesoscopic Dayem bridges as a flexible platform for designing and controlling superconducting diode functionalities.
  arXiv  Detail & Related papers  (2025-07-16T14:26:18Z)
• Broken symmetry states and Quantum Hall Ferromagnetism in decoupled twisted bilayer graphene [0.41819706568983034]
  Twisted bilayer graphene (TBLG) with large twist angle is a novel 2D bilayer system with strong interlayer Coulomb interactions. We demonstrate the role of charge screening effects in electronically decoupled TBLG.
  arXiv  Detail & Related papers  (2025-03-26T10:15:22Z)
• Constrained many-body phases in a $\mathbb{Z}_2$-Higgs lattice gauge theory [39.58317527488534]
  We study a one-dimensional $mathbbZ$ lattice gauge theory coupled to soft-core bosonic matter at unit filling. Through a combination of analytical perturbative approaches, we uncover a rich phase diagram driven by gauge-field-mediated resonant pair hopping. The presence of a bunching state with large number fluctuations motivates experimental realizations in hybrid boson-qubit quantum simulation platforms.
  arXiv  Detail & Related papers  (2025-03-05T19:00:07Z)
• Strain induced topological phase transitions in split and line graphs of bipartite lattices featuring flat bands [7.0566221827695506]
  We study a class of 2D lattices that generically support flat bands and focus on the effects of strain on their electronic and topological properties. In the absence of strain, the introduction of spin-orbit coupling induces a bulk excitation gap, which transforms flat bands into quasi-flat bands with topologically nontrivial characteristics. Our results highlight the potential of strain engineering as a versatile tool for manipulating electronic and topological phases in a wide variety of 2D materials.
  arXiv  Detail & Related papers  (2025-01-20T23:16:37Z)
• Tailoring coherent charge transport in graphene by deterministic defect generation [36.136619420474766]
  We introduce lattice defects in graphene that enable phase-matched charge carrier waves. Multiple electronic Fabry-Perot cavities are formed by creating periodically alternating defective and pristine nano-stripes. Defective stripes behave as partially reflecting mirrors and resonantly confine the charge carrier waves within the pristine areas, giving rise to Fabry-Perot resonant modes. These coherent phenomena survive up to 30 K for both polarities of charge carriers, contrarily to traditional monopolar electrostatically created Fabry-Perot interferometers.
  arXiv  Detail & Related papers  (2024-09-07T15:37:23Z)
• 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.