Microwave Experiments and Noise in Mesoscopic Devices

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School of Science | Doctoral thesis (article-based) | Defence date: 2015-06-11
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88 + app. 57
Aalto University publication series DOCTORAL DISSERTATIONS, 69/2015
This thesis is a compilation of several works in the area of condensed matter physics, and with devices based on superconducting Josephson junctions (JJ) as the common denominator for the presented projects apart from the work on diffusive systems. Microwave measurements were conducted on a Superconducting Cooper pair transistor to explore its current-phase relationship. Measurements on a JJ-based qubit coupled to a LC resonator revealed the vibronic transitions obeying the Franck-Condon principle. The main body of the thesis is the work done on the Bloch Oscillating Transistor (BOT), an ultra low noise quantum amplifier. In the present work, we investigated the dynamics of the BOT near the bifurcation threshold as well as implemented differential BOTs to check its capability to reject common mode signals. To account for our studies of quantum features in mesoscopic systems other than JJs, we performed an experiment similar to the Hanbury-Brown and Twiss interferometry in optics. For this mesoscopic interference experiment we selected a multiterminal diffusive system. We developed a low temperature noise measurement scheme to study current-current correlations in the GHz frequency range. In our experiments we found a small positive HBT exchange correction factor in the non-interacting limit at low bias voltage in the presence of quantum interference. We found negative exchange correction factor in the hot electron case for similar structures, which agrees well with the theory. Altogether, our experiments demonstrated the theoretically predicted HBT exchange effects in non-interacting and interacting regime of electron transport in a diffusive mesoscopic system.
Supervising professor
Hakonen, Pertti, Prof., Aalto University, O. V. Lounasmaa Laboratory, Finland
Thesis advisor
Hakonen, Pertti, Prof., Aalto University, O. V. Lounasmaa Laboratory, Finland
low temperature, bloch oscillating transistor, Superconducting Cooper pair transistor, artificial atom, diffusive system, shot noise, current-current correlation
Other note
  • [Publication 1]: Jayanta Sarkar, Antti Puska, Akira Hida, and Pertti J. Hakonen “Hanbury-Brown and Twiss type exchange effects in four-terminal diffusive conductor.” (submitted).
  • [Publication 2]: Jayanta Sarkar, Antti Puska, Juha Hassel and Pertti J Hakonen “Differential Bloch oscillating transistor pair”, Supercond. Sci. Technol., 26, 065009 (2013).
    DOI: 10.1088/0953-2048/26/6/065009 View at publisher
  • [Publication 3]: Jayanta Sarkar, Antti Puska, Juha Hassel and P.J. Hakonen “Dynamics of Bloch oscillating transistor near the bifurcation threshold”, Phys. Rev. B, 87, 224514 (2013).
    DOI: 10.1103/PhysRevB.87.224514 View at publisher
  • [Publication 4]: Antti Paila, David Gunnarsson, Jayanta Sarkar, Mika Sillanpaa, and Pertti J. Hakonen “Current-Phase Relation and Josephson Inductance of Superconducting Cooper Pair Transistor”, Phys. Rev. B, 80, 144520 (2009).
    DOI: 10.1103/PhysRevB.80.144520 View at publisher
  • [Publication 5]: David Gunnarson, Jani Tuorila, Antti Paila, Jayanta Sarkar, Erkki Thuneberg, Yury Makhlin, and Pertti Hakonen “Vibronic spectroscopy of an artificial molecule”, Phys. Rev. Lett., 101, 256806 (2008).
    DOI: 10.1103/PhysRevLett.101.256806 View at publisher
  • [Publication 6]: A. Paila, J. Tuorila, M. Sillanpaa, D. Gunnarsson, J. Sarkar, Y. Makhlin, E. Thuneberg, and P. J. Hakonen “Interband transitions and interference effects in superconducting qubits” , Quantum Information Processing, 8, 245 (2009).
    DOI: 10.1007/s11128-009-0102-4 View at publisher