Optical absorption and carrier multiplication at graphene edges in a magnetic field

• URL: http://arxiv.org/abs/2107.14524v1
• Date: Fri, 30 Jul 2021 10:16:27 GMT
• Title: Optical absorption and carrier multiplication at graphene edges in a magnetic field
• Authors: Friedemann Queisser, Sascha Lang, Ralf Sch\"utzhold
• Abstract summary: We study optical absorption at graphene edges in a magnetic field. The magnetic field bends the trajectories of particle- and hole excitations into antipodal direction. We find a rather strong amplification of the edge current by impact ionization processes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study optical absorption at graphene edges in a transversal magnetic field. The magnetic field bends the trajectories of particle- and hole excitations into antipodal direction which generates a directed current. We find a rather strong amplification of the edge current by impact ionization processes. More concretely, the primary absorption and the subsequent carrier multiplication is analyzed for a graphene fold and a zigzag edge. We identify exact and approximate selection rules and discuss the dependence of the decay rates on the initial state.

Related papers

• Generalized Gouy Rotation of Electron Vortex beams in uniform magnetic fields [54.010858975226945]
  We study the dynamics of EVBs in magnetic fields using exact solutions of the relativistic paraxial equation in magnetic fields. We provide a unified description of different regimes under generalized Gouy rotation, linking the Gouy phase to EVB rotation angles. This work offers new insights into the dynamics of EVBs in magnetic fields and suggests practical applications in beam manipulation and beam optics of vortex particles.
  arXiv  Detail & Related papers  (2024-07-03T03:29:56Z)
• Spin relaxation in inhomogeneous magnetic fields with depolarizing boundaries [24.03686690579752]
  Field-inhomogeneity-induced relaxation of atomic spins confined in vapor cells with depolarizing walls is studied. In contrast to nuclear spins, such as noble-gas spins, atomic spins in uncoated cells undergo randomization at the boundaries.
  arXiv  Detail & Related papers  (2024-03-13T07:15:50Z)
• Divergent absorption from spin-orbit interaction in distorted Landau levels [0.0]
  Effect of spin-orbit (and Darwin) interaction on a 2D electron gas subject to a radial, inhomogeneous $1/r$-magnetic field is discussed analytically. Numerical calculation of the absorptive spin-orbit spectra show for an ideal InSb electron gas a behaviour that is dominated by the localized (atomic) part of the distorted Landau levels. We show analytically the emergence of a discrete Rydberg-like band structure that obeys these symmetry properties.
  arXiv  Detail & Related papers  (2023-03-02T14:09:38Z)
• Magnetic square lattice with vertex coupling of a preferred orientation [0.0]
  We analyze a square lattice graph in a magnetic field. We show how the two effects compete; at the high energies the magnetic field dominates it.
  arXiv  Detail & Related papers  (2023-02-09T12:31:53Z)
• Magnetic-field-induced cavity protection for intersubband polaritons [52.77024349608834]
  We analyse the effect of a strong perpendicular magnetic field on an intersubband transition in a disordered doped quantum well strongly coupled to an optical cavity. The magnetic field changes the lineshape of the intersubband optical transition due to the roughness of the interface of the quantum well from a Lorentzian to a Gaussian one.
  arXiv  Detail & Related papers  (2022-10-14T18:00:03Z)
• Visualization of magnetic fields with cylindrical vector beams in a warm atomic vapor [5.538338444181318]
  We propose and demonstrate an experimental implementation for the observation of magnetic fields from spatial features of absorption profiles in a warm atomic vapor. A radially polarized vector beam that traverses an atomic vapor will generate an absorption pattern with petal-like structure by the mediation of a transverse magnetic field.
  arXiv  Detail & Related papers  (2021-09-29T13:10:42Z)
• Rotating Majorana Zero Modes in a disk geometry [75.34254292381189]
  We study the manipulation of Majorana zero modes in a thin disk made from a $p$-wave superconductor. We analyze the second-order topological corner modes that arise when an in-plane magnetic field is applied. We show that oscillations persist even in the adiabatic phase because of a frequency independent coupling between zero modes and excited states.
  arXiv  Detail & Related papers  (2021-09-08T11:18:50Z)
• Motion-induced radiation due to an atom in the presence of a graphene plane [62.997667081978825]
  We study the motion-induced radiation due to the non-relativistic motion of an atom in the presence of a static graphene plate. We show that the effect of the plate is to increase the probability of emission when the atom is near the plate and oscillates along a direction perpendicular to it.
  arXiv  Detail & Related papers  (2021-04-15T14:15:23Z)
• Confinement in Gapped Graphene with Magnetic Flux [0.0]
  We study the propagation of electrons in a circular quantum dot of gapped graphene subject to the magnetic flux $phi$. We identify different scattering regimes as a function of the physical parameters such as the incident electronic energy, potential barrier, radius of quantum dot, gap and $phi$.
  arXiv  Detail & Related papers  (2020-06-13T12:17:30Z)
• Study of electronic properties, Magnetization and persistent currents in a mesoscopic ring by controlled curvature [1.7637225649382287]
  We study the model of a noninteracting spinless electron gas confined to the two-dimensional localized surface of a cone in the presence of external magnetic fields. We write the Schr"odinger equation and use the thin-layer quantization procedure to calculate the wavefunctions and the energy spectrum.
  arXiv  Detail & Related papers  (2020-05-03T00:10:41Z)
• Spin current generation and control in carbon nanotubes by combining rotation and magnetic field [78.72753218464803]
  We study the quantum dynamics of ballistic electrons in rotating carbon nanotubes in the presence of a uniform magnetic field. By suitably combining the applied magnetic field intensity and rotation speed, one can tune one of the currents to zero while keeping the other one finite, giving rise to a spin current generator.
  arXiv  Detail & Related papers  (2020-01-20T08:54:56Z)

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.