Magnetic field generation with helical laser beams in electron-hole plasmas

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Ikram, H. M. and Ali, Shahid and Khan, Muhammad Zubair and Eliasson, Bengt (2025) Magnetic field generation with helical laser beams in electron-hole plasmas. EPL (Europhysics Letters). (In Press)

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Abstract

A circularly polarized Laguerre-Gaussian (LG) laser beam moves in an electron-hole plasma, producing a quasi-static magnetic field in azimuthal direction. To achieve this, electron and hole momentum equations are solved taking nonrelativistic ponderomotive and Lorentz forces on equal footing. However, the present model neglects quantum effects for low-carrier densities and high temperatures, also omitting electron-hole thermal pressures compared with ponderomotive force. Electron and hole velocities move along the z-axis to generate the current density according to the Ampère's law, resulting in the azimuthal magnetic field. The latter strongly depends on laser intensity and confirms its behavior in typical semiconducting materials. A high degree of agreement between the analytical and numerical results is found, supporting the validity of the analytical method. Numerically, it is shown that azimuthal and radial mode numbers, pulse amplitude, and hole-to-electron effective mass ratios significantly modify the magnetic field profiles. The present findings only validate a non-relativistic classical electron-hole plasma for which the carrier density must be smaller than the critical density ne0 ≤ ncr-.

ORCID iDs

Ikram, H. M., Ali, Shahid, Khan, Muhammad Zubair and Eliasson, Bengt ORCID logoORCID: https://orcid.org/0000-0001-6039-1574;
  • Item type:Article
    ID code:92843
    Dates:
    Date
    Event
    14 May 2025
    Published
    14 May 2025
    Accepted
    13 April 2025
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:14 May 2025 09:48
    Last modified:14 May 2025 09:48
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/92843
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