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FOPRA Experiment 16: Josephson Effects in Superconductors (AEP, KM, QST-EX)

Course 0000100016 in WS 2023/4

General Data

Course Type practical training
Semester Weekly Hours 1 SWS
Organisational Unit Technical Physics
Lecturers Kedar Honasoge
Wun Kwan Yam
Responsible/Coordination: Rudolf Gross
Dates

Assignment to Modules

Further Information

Courses are together with exams the building blocks for modules. Please keep in mind that information on the contents, learning outcomes and, especially examination conditions are given on the module level only – see section "Assignment to Modules" above.

additional remarks You will perform a low temperature experiment at liquid helium temperature (4.2 K) to investigate a superconducting tunnel junction - a so-called Josephson junction - consisting of two Nb 100 nm thick electrodes separated by a thin aluminium oxide (AlOx) layer (about 17 nm thick). The junction area is a square with an edge length L of about 20 μm. Josephson junction feature a finite supercurrent (Josephson current) through the tunneling barrier at zero voltage drop between the two junction electrodes. You will measure the maximum Josephson current I_c by recording the IV-characteristics of the junction. The zero-voltage Josephson current across a Josephson junction is proportional to the sine of the phase difference varphi of the macroscopic wave functions describing the two superconducting junction electrodes: I_s = I_c sin(varphi). This phase difference is modified by a magnetic field applied parallel to the tunneling barrier. This results in a characteristic magnetic field dependence of the maximum Josephson current, corresponding to the diffraction pattern of a slit in optics. You will record this pattern and derive the Josephson penetration depth from the period of the pattern. From the experiment you will get basic insights into the phasics of Josephson junctions and in techniques used to perform low temperature experiments.
Links Course documents
Current information
TUMonline entry
TUMonline registration for 01: 16.10.2023 - 21.10.2023, 02: 23.10.2023 - 28.10.2023
TUMonline registration for 03: 30.10.2023 - 04.11.2023, 04: 06.11.2023 - 11.11.2023

Equivalent Courses (e. g. in other semesters)

SemesterTitleLecturersDates
SS 2024 FOPRA Experiment 16: Josephson Effects in Superconductors (AEP, KM, QST-EX) Honasoge, K. Yam, W.
Responsible/Coordination: Gross, R.
SS 2023 FOPRA Experiment 16: Josephson Effects in Superconductors (AEP, KM, QST-EX) Honasoge, K. Kronowetter, F.
Responsible/Coordination: Gross, R.
WS 2022/3 FOPRA Experiment 16: Josephson Effects in Superconductors (AEP, KM, QST-EX) Honasoge, K. Kronowetter, F. Nojiri, Y.
Responsible/Coordination: Gross, R.
SS 2022 FOPRA Experiment 16: Josephson Effects in Superconductors (AEP, KM, QST-EX) Honasoge, K. Kronowetter, F. Nojiri, Y.
Responsible/Coordination: Gross, R.
WS 2021/2 FOPRA Experiment 16: Josephson Effects in Superconductors (AEP, KM, QST-EX) Nojiri, Y.
Responsible/Coordination: Gross, R.
SS 2021 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Nojiri, Y.
WS 2020/1 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Nojiri, Y.
SS 2020 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Nojiri, Y.
WS 2019/20 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Nojiri, Y.
SS 2019 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
WS 2018/9 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
SS 2018 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Fischer, M.
WS 2017/8 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Fischer, M.Pogorzalek, S.
SS 2017 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Fischer, M.Pogorzalek, S.
WS 2016/7 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Fischer, M.Pogorzalek, S.
SS 2016 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Fischer, M.
WS 2015/6 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Fischer, M.
SS 2015 FOPRA Experiment 16: Josephson Effects in Superconductors Gross, R.
Assistants: Fischer, M.
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