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Nonlinear dynamics of josephson junction chains and superconducting resonators

Başlık çevirisi mevcut değil.

  1. Tez No: 401071
  2. Yazar: ADEM ERGÜL
  3. Danışmanlar: PROF. DAVID B. HAVILAND
  4. Tez Türü: Doktora
  5. Konular: Fizik ve Fizik Mühendisliği, Physics and Physics Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2013
  8. Dil: İngilizce
  9. Üniversite: KTH-Kungliga Tekniska Högskolan (Royal Institute of Technology)
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 125

Özet

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Özet (Çeviri)

This thesis presents the results of the experimental studies on two kind of Superconducting circuits: one-dimensional Josephson junction chains and superconducting coplanar waveguide (CPW) resonators. One-dimensional Josephson junction chains are constructed by connecting many Superconducting quantum interference devices (SQUIDs) in series. We have studied DC transport properties of the SQUID chains and model their nonlinear dynamics with Thermally Activated Phase-Slips (TAPS). Experimental and simulated results showed qualitative agreement revealing the existence of a uniform phase-slipping and phase-sticking process which results in a voltageindependent current on the dissipative branch of the current-voltage characteristics (IVC). By modulating the effective Josephson coupling energy of the SQUIDs (EJ ) with an external magnetic field, we found that the ratio EJ/EC is a decisive factor in determining the qualitative shape of the IVC. A quantum phase transition between incoherent Quantum Phase Slip, QPS (supercurrent branch with a finite slope) to coherent QPS (IVC with well-developed Coulomb blockade) via an intermediate state (supercurrent branch with a remnant of Coulomb blockade) is observed as the EJ/EC ratio is tuned. This transition from incoherent QPS to the intermediate-state happens around R0 = RQ (RQ = h/4e2 = 6.45k ). We also fabricated structured chains where a SQUID at the middle of the chain (central SQUID) has different junction size and loop area compared to other SQUIDs in the chain. Results showed that with these structured chains it is possible to localize and tune the amplitude of both TAPS and QPS at the central SQUID. The second part of the thesis describes the fabrication process and the measurement results of superconducting CPW resonators. Resonators with different design parameters were fabricated and measured. The transmission spectra showed quality factors up to, Q  5×105. We have observed bending of the resonance curves to the lower frequencies due to existence of a nonlinear kinetic inductance. The origin of the nonlinear kinetic inductance is the nonlinear relation between supercurrent density, Js and superfluid velocity, vs, of the charge carriers on the center line of the resonators. A simple model based on the Ginzburg-Landau theory is used in order to explain observed nonlinear kinetic inductance and estimates using this model showed good agreement with the experimental results.

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