Hira Joshi
Articles written in Pramana – Journal of Physics
Volume 44 Issue 3 March 1995 pp 271-277
An expression for the static structure factor,
Volume 52 Issue 2 February 1999 pp 195-217
S P Tewari Hira Joshi Kakoli Bera Jyoti Sood
The full wavevector and frequency dependent complex dielectric function for two component classical and quantum rare hot plasmas have been derived. The real part of dielectric function is obtained in the form of a series. Difference between quantum and classical real and imaginary parts of dielectric function have been brought out by making explicit calculations. The quantum nature of the plasma brings about significant changes in both parts depending upon the magnitude of quantum parameter,
Expressions for the dynamic structure factors for both two component classical and quantum plasma have been evaluated for different values of the mass of the positive component
Instability of plasma modes in the presence of constant electric field has also been worked out for the quantum case.
Volume 87 Issue 2 August 2016 Article ID 0029 Research Article
Quantum ring states in magnetic field and delayed half-cycle pulses
KRITI BATRA HIRA JOSHI VINOD PRASAD
The present work is dedicated to the time evolution of excitation of a quantum ring in external electric and magnetic fields. Such a ring of mesoscopic dimensions in an external magnetic field is known to exhibit a wide variety of interesting physical phenomena. We have studied the dynamics of the single electron quantum ring in the presence of a static magnetic field and a combination of delayed half-cycle pulse pair. Detailed calculations have been worked out and the impact on dynamics by variation in the ring radius, intensity of external electric field, delay between the two pulses, and variation in magnetic field have been reported. A total of 19 states have been taken and the population transfer in the single electron quantum ring is studied by solving the time-dependent Schrödinger equation (TDSE), using the efficient fourth-order Runge--Kutta method. Many interesting features have been observed in the transition probabilities with the variation of magnetic field, delay between pulses and ring dimensions. A very important aspect of the present work is the persistent current generation in a quantum ring in the presence of external magnetic flux and its periodic variation with the magnetic flux, ring dimensions and pulse delay.
Volume 94, 2019
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