Emerging holonomy in electron spin scattering

• URL: http://arxiv.org/abs/2502.09360v1
• Date: Thu, 13 Feb 2025 14:26:56 GMT
• Title: Emerging holonomy in electron spin scattering
• Authors: Lorenzo Bagnasacco, Fabio Taddei, Vittorio Giovannetti,
• Abstract summary: We develop a method for calculating the scattering matrix of electrons in a one-dimensional coherent conductor connected to two electrodes. In particular, we show that in the high-energy limit, the transmission matrix aligns with the holonomy, reducing to a pure topological form. Our results indicate the possibility of achieving near-perfect spin-flip transmission, with implications for use in spintronic applications.
• Score: 0.5461938536945721
• License:
• Abstract: By evidencing the holonomic and dynamical contributions in scattering problems, we develop a method for calculating the scattering matrix of electrons in a one-dimensional coherent conductor connected to two electrodes. To validate our approach, we investigate the spin-resolved scattering of electrons along a wire subjected to a spatially varying magnetic (Zeeman) field. In particular, we show that in the high-energy limit, the transmission matrix aligns with the holonomy, reducing to a pure topological form. We illustrate the method by examining several scenarios with varied in-plane magnetic field profiles. For instance, our results indicate the possibility of achieving near-perfect spin-flip transmission, with implications for use in spintronic applications.

Related papers

• Entanglement Witness for Indistinguishable Electrons using Solid-State Spectroscopy [6.046809805810101]
  Characterizing entanglement in quantum materials is crucial for advancing next-generation quantum technologies. We introduce a method to extract various four-fermion correlations by analyzing the nonlinearity in resonant inelastic X-ray scattering (RIXS) spectra. We show how this entanglement witness can efficiently quantify multipartite entanglement across different phase regions, highlighting its advantage over quantum Fisher information (QFI)
  arXiv  Detail & Related papers  (2024-08-09T05:46:05Z)
• Spin-dependent edge states in two-dimensional Dirac materials with a flat band [0.0]
  We investigate spin-dependent Dirac electron optics in 2D pseudospin-1 Dirac materials. electrons with a specific spin orientation (e.g., spin-down) can be trapped in a class of long-lived edge modes, generating resonant scattering.
  arXiv  Detail & Related papers  (2024-02-22T03:24:48Z)
• Mapping of valley-splitting by conveyor-mode spin-coherent electron shuttling [0.0]
  In Si/SiGe heterostructures, the low-lying excited valley state seriously limits operability and scalability of electron spin qubits. We introduce a method for two-dimensional mapping of the local valley splitting using entangled electron spin-pairs as a probe. Our method may become a valuable tool for engineering Si/SiGe heterostructures for scalable quantum computing.
  arXiv  Detail & Related papers  (2023-12-29T17:21:04Z)
• Tailoring Near-Field-Mediated Photon Electron Interactions with Light Polarization [0.0]
  We investigate the effect of the polarization and the spatial profile of plasmonic near-field distributions on shaping free-electrons. We show that polarization of the exciting light can be used as a control knop for disseminating acceleration and deceleration path ways. We also demonstrate the possibility of tailoring the shape of localized plasmons by incorporating specific arrangements of nanorods.
  arXiv  Detail & Related papers  (2022-11-17T10:44:44Z)
• Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor [62.997667081978825]
  We experimentally investigate individual spin dynamics in a two-dimensional ensemble of electron spins on the surface of a diamond crystal. We show that this anomalously slow relaxation rate is due to the presence of strong dynamical disorder. Our work paves the way towards microscopic study and control of quantum thermalization in strongly interacting disordered spin ensembles.
  arXiv  Detail & Related papers  (2022-07-21T18:00:17Z)
• Calculating non-linear response functions for multi-dimensional electronic spectroscopy using dyadic non-Markovian quantum state diffusion [68.8204255655161]
  We present a methodology for simulating multi-dimensional electronic spectra of molecular aggregates with coupling electronic excitation to a structured environment. A crucial aspect of our approach is that we propagate the NMQSD equation in a doubled system Hilbert space but with the same noise.
  arXiv  Detail & Related papers  (2022-07-06T15:30:38Z)
• Controlled coherent dynamics of [VO(TPP)], a prototype molecular nuclear qudit with an electronic ancilla [50.002949299918136]
  We show that [VO(TPP)] (vanadyl tetraphenylporphyrinate) is a promising system suitable to implement quantum computation algorithms. It embeds an electronic spin 1/2 coupled through hyperfine interaction to a nuclear spin 7/2, both characterized by remarkable coherence.
  arXiv  Detail & Related papers  (2021-03-15T21:38:41Z)
• Effects of the dynamical magnetization state on spin transfer [68.8204255655161]
  We show that the complex interactions between the spin-polarized electrons and the dynamical states of the local spins can be decomposed into separate processes. Our results suggest that exquisite control of spin transfer efficiency and of the resulting dynamical magnetization states may be achievable.
  arXiv  Detail & Related papers  (2021-01-21T22:12:03Z)
• 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)
• General quantum-mechanical solution for twisted electrons in a uniform magnetic field [68.8204255655161]
  A theory of twisted (and other structured) paraxial electrons in a uniform magnetic field is developed. The observable effect of a different behavior of relativistic Laguerre-Gauss beams with opposite directions of the orbital angular momentum penetrating from the free space into a magnetic field is predicted.
  arXiv  Detail & Related papers  (2020-05-13T16:35:10Z)
• Energy and momentum conservation in spin transfer [77.34726150561087]
  We show that energy and linear momentum conservation laws impose strong constraints on the properties of magnetic excitations induced by spin transfer. Our results suggest the possibility to achieve precise control of spin transfer-driven magnetization dynamics.
  arXiv  Detail & Related papers  (2020-04-04T15:43:30Z)

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.