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
  • Press review of “A Josephson phase battery”

    Press review of “A Josephson phase battery”

    We are very glad that our research work about the Josephson quantum phase battery (recently published on Nature Nanotechnology), raised a considerable interest in the past weeks and has been featured on the main national and international press. You can find below some of the most relevant articles: check them out ad read what they are saying … Continue reading "Press review of “A Josephson phase battery”"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

Mercaldo, M. T., Solinas, P., Giazotto, F., & Cuoco, M. (2020). Electrically Tunable Superconductivity Through Surface Orbital Polarization. Physical Review Applied, 14(3), 034041. http://doi.org/10.1103/PhysRevApplied.14.034041. arXiv: https://link.aps.org/doi/10.1103/PhysRevApplied.14.034041
Marchegiani, G., Braggio, A., & Giazotto, F. (2020). Noise effects in the nonlinear thermoelectricity of a Josephson junction. ArXiv:2009.05565 [Cond-Mat]. arXiv: http://arxiv.org/abs/2009.05565
Bours, L., Mercaldo, M. T., Cuoco, M., Strambini, E., & Giazotto, F. (2020). Unveiling Mechanisms of Electric Field Effects on Superconductors by Magnetic Field Response. Physical Review Research, 2(3), 033353. http://doi.org/10.1103/PhysRevResearch.2.033353. arXiv: http://arxiv.org/abs/2003.01655
Rocci, M., De Simoni, G., Puglia, C., Esposti, D. D., Strambini, E., … Giazotto, F. (2020). Gate-Controlled Suspended Titanium Nanobridge Supercurrent Transistor. ACS Nano. doi:10.1021/acsnano.0c05355. arXiv: https://doi.org/10.1021/acsnano.0c05355
Solinas, P., Amoretti, A., & Giazotto, F. (2020). Schwinger effect in a Bardeen-Cooper-Schrieffer superconductor. ArXiv:2007.08323 [Cond-Mat, Physics:Hep-Th, Physics:Quant-Ph]. arXiv: http://arxiv.org/abs/2007.08323
Paolucci, F., Buccheri, V., Germanese, G., Ligato, N., Paoletti, R., … Giazotto, F. (2020). Highly sensitive nano-TESs for gigahertz astronomy and dark matter search. ArXiv:2007.08320 [Cond-Mat]. arXiv: http://arxiv.org/abs/2007.08320
Puglia, C., De Simoni, G., Ligato, N., & Giazotto, F. (2020). Vanadium gate-controlled Josephson half-wave nanorectifier. Applied Physics Letters, 116(25), 252601. http://doi.org/10.1063/5.0013512. arXiv: http://arxiv.org/abs/2005.05671
Marchegiani, G., Braggio, A., & Giazotto, F. (2020). Phase-tunable thermoelectricity in a Josephson junction. ArXiv:2006.10631 [Cond-Mat]. arXiv: http://arxiv.org/abs/2006.10631
Strambini, E., Iorio, A., Durante, O., Citro, R., Sanz-Fernández, C., … Giazotto, F. (2020). A Josephson phase battery. Nature Nanotechnology. http://doi.org/10.1038/s41565-020-0712-7. arXiv: http://arxiv.org/abs/2001.03393
De Simoni, G., Puglia, C., & Giazotto, F. (2020). Niobium Dayem nano-bridge Josephson field-effect transistors. Applied Physics Letters, 116(24), 242601. http://doi.org/10.1063/5.0011304. arXiv: http://arxiv.org/abs/2004.09182
Marchegiani, G., Braggio, A., & Giazotto, F. (2020). A superconducting nonlinear thermoelectric heat engine. Physical Review B, 101(21), 214509. http://doi.org/10.1103/PhysRevB.101.214509. arXiv: http://arxiv.org/abs/2003.03314
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. http://doi.org/10.1103/PhysRevLett.124.227701. arXiv: http://arxiv.org/abs/1911.04367
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. http://doi.org/10.1088/1742-6596/1559/1/012020
Ligato, N., Strambini, E., Paolucci, F., & Giazotto, F. (2020). Persistent Josephson Phase-Slip Memory with Topological Protection. ArXiv:2005.14298 [Cond-Mat]. arXiv: http://arxiv.org/abs/2005.14298
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. http://doi.org/10.1103/PhysRevResearch.2.023165. arXiv: http://arxiv.org/abs/2001.07621
Puglia, C., De Simoni, G., Ligato, N., & Giazotto, F. (2020). Vanadium gate-controlled Josephson half-wave nanorectifier. ArXiv:2005.05671 [Cond-Mat]. arXiv: http://arxiv.org/abs/2005.05671
Puglia, C., De Simoni, G., & Giazotto, F. (2020). Electrostatic control of phase slips in Ti Josephson nanotransistors. Physical Review Applied, 13(5), 054026. http://doi.org/10.1103/PhysRevApplied.13.054026. arXiv: http://arxiv.org/abs/1910.14000
Giazotto, F., & Bergeret, F. S. (2020). Very large thermal rectification in ferromagnetic insulator-based superconducting tunnel junctions. Applied Physics Letters, 116(19), 192601. http://doi.org/10.1063/5.0010148. arXiv: http://arxiv.org/abs/2004.03620
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. http://doi.org/10.1103/PhysRevB.101.180502. arXiv: http://arxiv.org/abs/2002.08230
Mercaldo, M. T., Solinas, P., Giazotto, F., & Cuoco, M. (2020). Electrically Tunable Superconductivity Through Surface Orbital Polarization. ArXiv:1907.09227 [Cond-Mat]. arXiv: http://arxiv.org/abs/1907.09227
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. http://doi.org/10.1103/PhysRevApplied.13.054006. arXiv: http://arxiv.org/abs/1906.10988
De Simoni, G., Puglia, C., & Giazotto, F. (2020). Niobium Dayem nano-bridge Josephson field-effect transistors. ArXiv:2004.09182 [Cond-Mat]. arXiv: http://arxiv.org/abs/2004.09182
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: http://arxiv.org/abs/2003.05966
Marchegiani, G., Braggio, A., & Giazotto, F. (2020). Nonlinear thermoelectricity with electron-hole symmetric systems. Physical Review Letters, 124(10), 106801. http://doi.org/10.1103/PhysRevLett.124.106801. arXiv: http://arxiv.org/abs/1909.04590
Marchegiani, G., Braggio, A., & Giazotto, F. (2020). A superconducting nonlinear thermoelectric heat engine. ArXiv:2003.03314 [Cond-Mat]. arXiv: http://arxiv.org/abs/2003.03314
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. http://doi.org/10.1007/s10909-020-02381-x
Scharf, B., Braggio, A., Strambini, E., Giazotto, F., & Hankiewicz, E. M. (2020). Topological Josephson Heat Engine. ArXiv:2002.05492 [Cond-Mat]. arXiv: http://arxiv.org/abs/2002.05492
List of all publications »
Research highlights