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.
- “Digital superconducting quantum machines” (DSQM), an innovative project by SQEL researchers, is among the four winning projects of the “Start Cup Toscana 2020” an initiative that rewards the best innovative ideas born in the world of university research. DSQM is the development of ultra-fast, low-power consumption superconducting circuits. This new frontier of information technology will … Continue reading "“Digital Superconducting Quantum Machines” among the winners of “Start Cup Toscana”"Read more
Phase-coherent caloritronics takes advantage of long-range phase coherence in superconducting condensates to manipulate heat currents in solid-state mesoscopic circuits…
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…
Ferromagnetic insulator-superconductor systemsA 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…
- Under standard conditions, the electrostatic field-effect is negligible in conventional metals and was expected to be completely ineffective also in superconducting metals. This common belief was recently put under question by a family of experiments that displayed full gate-voltage-induced suppression of critical current in superconducting all-metallic gated nanotransistors. A new …Read more