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Simulating current voltage characteristics in Intrinsic Josephson junctions M. Hromnik

Simulating current voltage characteristics in Intrinsic Josephson junctions M. Hromnik Yu. M. Shukrinov M Gaafar BLTP, JINR, Dubna , Russia. X:50mV/div Y:100 m A/div.

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Simulating current voltage characteristics in Intrinsic Josephson junctions M. Hromnik

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  1. Simulating current voltage characteristics in Intrinsic Josephson junctions M. Hromnik Yu. M. Shukrinov M Gaafar BLTP, JINR, Dubna , Russia

  2. X:50mV/div Y:100mA/div Layered Bi2Sr2CaCu2Oy(Bi2212) single crystals represent natural stacks of atomic scale intrinsic Josephson junctions. I-V characteristics – Multi-branch structure – large hysteresis – Roughly equal spacing

  3. Applications of Josephson Junctions • Defines a Voltage standard - metrology • Quantum computing – single electron transistors • SQUIDS – superconducting quantum interface devices able to measure magnetic fields down to 10^-18 T • STJs – Superconducting tunnel junction detectors which make use of quantum electron tunneling through the JJ – high speed electrical circuits

  4. Numerical Procedure4th order Runge Kutta method • Heavy duty computation – O(10^9) time steps • Intelligent data logging – on the fly averaging ensures a manageable and meaningful output • Intelligent disk IO – buffering (significant effect of performance) • Looping technique to match experimental method • Parallel computing options limited

  5. Time dependence Ql=Q0 (Vl+1-Vl)Q0 = 0 V0/rD2 • div (0 E) = Q

  6. Current Voltage characteristics

  7. Longitudinal Plasma Wave

  8. Results from CJJ+DC model

  9. Thank you!

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