Tailoring coherent charge transport in graphene by deterministic defect generation

• URL: http://arxiv.org/abs/2409.04858v2
• Date: Thu, 12 Dec 2024 18:08:21 GMT
• Title: Tailoring coherent charge transport in graphene by deterministic defect generation
• Authors: Nicola Melchioni, Federico Paolucci, Paolo Marconcini, Massimo Macucci, Stefano Roddaro, Alessandro Tredicucci, Federica Bianco,
• Abstract summary: 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.
• Score: 36.136619420474766
• License:
• Abstract: Harnessing the wave-nature of charge carriers in solid state devices, electron optics investigates and exploits coherent phenomena, in analogy with optics and photonics. Typically, this requires complex electronic devices leveraging macroscopically coherent charge transport in two-dimensional electron gases and superconductors. Here, collective coherent effects are induced in a simple counterintuitive architecture by defect engineering. Deterministically introduced lattice defects in graphene enable the phase coherent charge transport by playing the role of potential barriers, instead of scattering centres as conventionally considered. Thus, graphene preserves its quasi-ballistic quantum transport and can support phase-matched charge carrier waves. Based on this approach, multiple electronic Fabry-P\`erot cavities are formed by creating periodically alternating defective and pristine nano-stripes through low energy electron-beam irradiation. Indeed, defective stripes behave as partially reflecting mirrors and resonantly confine the charge carrier waves within the pristine areas, giving rise to Fabry-P\`erot resonant modes. These modes experimentally manifest as sheet resistance oscillations, as also confirmed by Landauer-B\"uttiker simulations. Moreover, these coherent phenomena survive up to 30 K for both polarities of charge carriers, contrarily to traditional monopolar electrostatically created Fabry-P\`erot interferometers. Our study positions defective graphene as an innovative platform for coherent electronic devices, with potential applications in nano and quantum technologies.

Related papers

• Electron-Electron Interactions in Device Simulation via Non-equilibrium Green's Functions and the GW Approximation [71.63026504030766]
  electron-electron (e-e) interactions must be explicitly incorporated in quantum transport simulation. This study is the first one reporting large-scale atomistic quantum transport simulations of nano-devices under non-equilibrium conditions.
  arXiv  Detail & Related papers  (2024-12-17T15:05:33Z)
• Two-tone modulated cavity electromagnonics [0.0]
  Two-tone modulated cavity electromagnonics can prepare macroscopic magnonic quantum states. Ultra-sensitive magnon-based sensing can be realized by engineering backaction-evading interaction of magnons and photons.
  arXiv  Detail & Related papers  (2023-05-18T02:20:02Z)
• Quantum fluctuation of ferroelectric order in polar metals [2.392124256487091]
  "polar metallic phase" is an unusual metallic phase of matter containing long-range ferroelectric (FE) order in the electronic and atomic structure. We propose a general mechanism based on carrier-induced quantum fluctuations to explain this puzzling phenomenon.
  arXiv  Detail & Related papers  (2023-02-21T18:58:11Z)
• Quantum interaction of sub-relativistic aloof electrons with mesoscopic samples [91.3755431537592]
  Relativistic electrons experience very slight wave packet distortion and negligible momentum recoil when interacting with nanometer-sized samples. Modelling fast electrons as classical point-charges provides extremely accurate theoretical predictions of energy-loss spectra.
  arXiv  Detail & Related papers  (2022-11-14T15:22:37Z)
• Driving Force and Nonequilibrium Vibronic Dynamics in Charge Separation of Strongly Bound Electron-Hole Pairs [59.94347858883343]
  We study the dynamics of charge separation in one, two and three-dimensional donor-acceptor networks. This allows us to identify the precise conditions in which underdamped vibrational motion induces efficient long-range charge separation.
  arXiv  Detail & Related papers  (2022-05-11T17:51:21Z)
• Resonant tunneling diodes in semiconductor microcavities: modeling polaritonic features in the THz displacement current [0.0]
  The effect of the quantized electromagnetic field in the displacement current of a resonant tunneling diode is analyzed. This mimics known effects predicted by a Jaynes-Cummings model in closed systems. The computational burden involved in the multi-time measurements of THz currents is tackled by invoking a Bohmian description of the light-matter interaction.
  arXiv  Detail & Related papers  (2022-04-27T10:51:03Z)
• Engineering superconducting qubits to reduce quasiparticles and charge noise [14.613106897690752]
  We experimentally demonstrate how to control quasiparticle generation by downsizing the qubit. We shape the electromagnetic environment of the qubit above the superconducting gap, inhibiting quasiparticle poisoning. Our findings support the hypothesis that quasiparticle generation is dominated by the breaking of Cooper pairs at the junction.
  arXiv  Detail & Related papers  (2022-02-03T06:40:21Z)
• A low-loss ferrite circulator as a tunable chiral quantum system [108.66477491099887]
  We demonstrate a low-loss waveguide circulator constructed with single-crystalline yttrium iron garnet (YIG) in a 3D cavity. We show the coherent coupling of its chiral internal modes with integrated superconducting niobium cavities. We also probe experimentally the effective non-Hermitian dynamics of this system and its effective non-reciprocal eigenmodes.
  arXiv  Detail & Related papers  (2021-06-21T17:34:02Z)
• Demonstration of electron-nuclear decoupling at a spin clock transition [54.088309058031705]
  Clock transitions protect molecular spin qubits from magnetic noise. linear coupling to nuclear degrees of freedom causes a modulation and decay of electronic coherence. An absence of quantum information leakage to the nuclear bath provides opportunities to characterize other decoherence sources.
  arXiv  Detail & Related papers  (2021-06-09T16:23:47Z)
• Plasmon Oscillations and de Broglie's Matter Waves Instabilities [0.0]
  We study the effect of matter-wave instability on electron beam transport with arbitrary degree of degeneracy. The quantum charge screening and the chemical potential effects on the matter-wave formation and instabilities are discussed in detail.
  arXiv  Detail & Related papers  (2020-02-10T17:35:27Z)

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.