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Quantum ring states in magnetic field and delayed half-cycle pulses

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Abstract

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.

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Acknowledgement

The authors are thankful to the referee for the positive enlightening comments and suggestions which have greatly helped them to improve the manuscript.

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Authors and Affiliations

  1. University School of Basic and Applied Sciences, G.G.S. Indraprastha University, Delhi, 110 078, India

    KRITI BATRA

  2. Department of Physics, Gargi College, University of Delhi, Delhi, 110 049, India

    HIRA JOSHI

  3. Department of Physics, Swami Shraddhanand College, University of Delhi, Delhi, 110 036, India

    VINOD PRASAD

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  1. KRITI BATRA
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  2. HIRA JOSHI
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Correspondence to KRITI BATRA.

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BATRA, K., JOSHI, H. & PRASAD, V. Quantum ring states in magnetic field and delayed half-cycle pulses. Pramana - J Phys 87, 29 (2016). https://doi.org/10.1007/s12043-016-1226-6

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  • DOI: https://doi.org/10.1007/s12043-016-1226-6

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