2011/03/11 by Amnon Aharony, Y. Tokura, Yasuhiro Tokura +5 · 1 citation
Chemistry · Engineering · Physics and Astronomy · #Chemistry #Condensed matter physics #Electron #Physics #Polarization (electrochemistry) #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Qubit #Semiconductor materials and devices #Spin (aerodynamics) #Spin engineering #Spin polarization #Spin transistor #Topological Materials and Phenomena #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.84.035323
published as Phys. Rev. B84, 035323 (2011) · 13 pages, 8 figures
arxiv created 2011/03/11 · openalex publication_date 2011/07/29 · arxiv updated 2015/05/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Spin-1/2 electrons are scattered through one or two diamond-like loops, made of quantum dots connected by one-dimensional wires, and subject to both an Aharonov--Bohm flux and (Rashba and Dresselhaus) spin-orbit interactions. With some symmetry between the two branches of each diamond, and with appropriate tuning of the electric and magnetic fields (or of the diamond shapes), this device completely blocks electrons with one polarization and allows only electrons with the opposite polarization to be transmitted. The directions of these polarizations are tunable by these fields, and do not depend on the energy of the scattered electrons. For each range of fields one can tune the site and bond energies of the device so that the transmission of the fully polarized electrons is close to unity. Thus, these devices perform as ideal spin filters, and these electrons can be viewed as mobile qubits; the device writes definite quantum information on the spinors of the outgoing electrons. The device can also read the information written on incoming polarized electrons: The charge transmission through the device contains full information on this polarization. The double-diamond device can also act as a realization of the Datta--Das spin field-effect transistor.