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Welcome to SQEL!

Welcome to the Superconducting Quantum Electronics Lab home page. Our group focuses on the study of the properties of mesoscopic superconducting devices, ranging from fully metallic to hybrid superconductor-semiconductor systems. Using state of the art cryogenic techniques, we explore condensed matter physics at low temperatures, typically ranging from several Kelvin down to 10 milli Kelvin, both experimentally and theoretically.

Being situated at the NEST laboratory in Pisa, a large part of our research is performed on devices fabricated in house. Our facilities include an ISO 6 rated clean room featuring modern Electron Beam Lithography systems. Our shadow angle evaporator allows us to fabricate high quality mesoscopic devices consisting out of several different materials under Ultra High Vacuum conditions with a high degree of control over optional insulating oxide barriers. These devices are then loaded in one of our four state of the art helium 3 / helium 4 dilution cryostats, that reach sub 100 milli Kelvin temperatures.

On the experimental side, to supplement electrical characterization, we often investigate the thermal response of (hybrid) superconducting systems. The thermal behaviour can be enlighting in its own right, but can also be exploited to coherently control the flow of heat to realize cooling, heating, thermal diodes and even thermal logic in these mesoscopic devices.

In conjunction with our experimental efforts, our group proudly features several researchers that specialize in theoretical physics, thus creating a working environment rich of different knowledge and expertise.

Latest news
  • SQEL project TERASEC funded with an ERC PoC grant

    SQEL project TERASEC funded with an ERC PoC grant

    Among the 76 recipients of the ERC Proof of Concept grants – third round 2019, the TERASEC project will develop an innovative device for the detection of security threats of European citizens and infrastructures The researcher will receive a €150,000 grant to explore the innovation potential of its project and bring the results closer to … Continue reading "SQEL project TERASEC funded with an ERC PoC grant"Read more

Coherent caloritronics

Phase-coherent caloritronics takes advantage of long-range phase coherence in superconducting condensates to manipulate heat currents in solid-state mesoscopic circuits…

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Hybrid and topologically protected systems

The emergence of Majorana bound states in semiconducting nanowires is investigated by means of charge and heat quantum transport properties through normal-superconductor interfaces…

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Ferromagnetic insulator-superconductor systems

A renewed interest in studying ferromagnetic/superconductor structures came with the development of superconducting spintronics. A ferromagnetic insulator in contact with a superconductor is known to induce an exchange splitting of the…

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Recent publications

Marchegiani, G., Braggio, A., & Giazotto, F. (2020). Phase-tunable thermoelectricity in a Josephson junction. ArXiv:2006.10631 [Cond-Mat]. arXiv:
Strambini, E., Iorio, A., Durante, O., Citro, R., Sanz-Fernández, C., … Giazotto, F. (2020). A Josephson phase battery. Nature Nanotechnology. arXiv:
Rocci, M., De Simoni, G., Puglia, C., Esposti, D. D., Strambini, E., … Giazotto, F. (2020). Gate-controlled Suspended Titanium Nanobridge Supercurrent Transistor. ArXiv:2006.07091 [Cond-Mat]. arXiv:
Marchegiani, G., Braggio, A., & Giazotto, F. (2020). A superconducting nonlinear thermoelectric heat engine. Physical Review B, 101(21), 214509. arXiv:
Blasi, G., Taddei, F., Arrachea, L., Carrega, M., & Braggio, A. (2020). Nonlocal Thermoelectricity in a S-TI-S Junction in Contact with a N-Metal Probe: Evidence for Helical Edge States. Physical Review Letters, 124(22), 227701. arXiv:
Alesini, D., Babusci, D., Barone, C., Buonomo, B., Beretta, M. M., … Torrioli, G. (2020). Development of a Josephson junction based single photon microwave detector for axion detection experiments. Journal of Physics: Conference Series, 1559, 012020.
Ligato, N., Strambini, E., Paolucci, F., & Giazotto, F. (2020). Persistent Josephson Phase-Slip Memory with Topological Protection. ArXiv:2005.14298 [Cond-Mat]. arXiv:
Guarcello, C., Citro, R., Durante, O., Bergeret, F. S., Iorio, A., … Braggio, A. (2020). rf-SQUID measurements of anomalous Josephson effect. Physical Review Research, 2(2), 023165. arXiv:
Puglia, C., De Simoni, G., Ligato, N., & Giazotto, F. (2020). Vanadium gate-controlled Josephson half-wave nanorectifier. ArXiv:2005.05671 [Cond-Mat]. arXiv:
Puglia, C., De Simoni, G., & Giazotto, F. (2020). Electrostatic control of phase slips in Ti Josephson nanotransistors. Physical Review Applied, 13(5), 054026. arXiv:
Giazotto, F., & Bergeret, F. S. (2020). Very large thermal rectification in ferromagnetic insulator-based superconducting tunnel junctions. Applied Physics Letters, 116(19), 192601. arXiv:
Zhang, X. P., Golovach, V. N., Giazotto, F., & Bergeret, F. S. (2020). Phase-Controllable Nonlocal Spin Polarization in Proximitized Nanowires. Physical Review B, 101(18), 180502. arXiv:
Mercaldo, M. T., Solinas, P., Giazotto, F., & Cuoco, M. (2020). Electrically Tunable Superconductivity Through Surface Orbital Polarization. ArXiv:1907.09227 [Cond-Mat]. arXiv:
Vischi, F., Carrega, M., Braggio, A., Paolucci, F., Bianco, F., … Giazotto, F. (2020). Electron cooling with graphene-insulator-superconductor tunnel junctions and applications to fast bolometry. Physical Review Applied, 13(5), 054006. arXiv:
De Simoni, G., Puglia, C., & Giazotto, F. (2020). Niobium Dayem nano-bridge Josephson field-effect transistors. ArXiv:2004.09182 [Cond-Mat]. arXiv:
Paolucci, F., Ligato, N., Buccheri, V., Germanese, G., Virtanen, P., & Giazotto, F. (2020). Hypersensitive tunable Josephson escape sensor for gigahertz astronomy. ArXiv:2003.05966 [Cond-Mat]. arXiv:
Marchegiani, G., Braggio, A., & Giazotto, F. (2020). Nonlinear thermoelectricity with electron-hole symmetric systems. Physical Review Letters, 124(10), 106801. arXiv:
Marchegiani, G., Braggio, A., & Giazotto, F. (2020). A superconducting nonlinear thermoelectric heat engine. ArXiv:2003.03314 [Cond-Mat]. arXiv:
Bours, L., Mercaldo, M. T., Cuoco, M., Strambini, E., & Giazotto, F. (2020). Unveiling Mechanisms of Electric Field Effects on Superconductors by Magnetic Field Response. ArXiv:2003.01655 [Cond-Mat]. arXiv:
Alesini, D., Babusci, D., Barone, C., Buonomo, B., Beretta, M. M., … Torrioli, G. (2020). Status of the SIMP Project: Toward the Single Microwave Photon Detection. Journal of Low Temperature Physics.
Scharf, B., Braggio, A., Strambini, E., Giazotto, F., & Hankiewicz, E. M. (2020). Topological Josephson Heat Engine. ArXiv:2002.05492 [Cond-Mat]. arXiv:
List of all publications »
Research highlights