MajuLab Seminar by Benoît Grémaud – 8 February 2024
Seminar: Thursday, February 8, 2024
4:30 PM Singapore time / 9:30 AM French time
In person at the CQT level 3 seminar room & online via Zoom for the seminar. Registration is required.
Please register at: https://nus-sg.zoom.us/meeting/register/tZUucO6qrT8pG9InnrXicnqKTl3mRPyNZCtr
Benoît Grémaud, CNRS, Centre de Physique théorique, Marseille, France
Benoît Grémaud earned his PhD in 1997 from the Laboratoire Kastler-Brossel at the University Pierre and Marie Curie (Jussieu) with a focus on quantum chaos. After two years at the Free University of Brussels, he joined CNRS in 1998, exploring quantum chaos, cold atoms, and nonlinear effects in quantum transport. Awarded an HDR in 2008, he then worked in Singapore at the Centre for Quantum Technologies (CQT) and MajuLab, on cold atoms, many-body physics, and topology until 2018. Since then, he’s been at the Centre de Physique Théorique in Marseille, concentrating on quantum transport in condensed matter, particularly in junctions and Hall
systems.
Seminar
Quantum transport and shot noise in metals,
superconductors and fractional quantum Hall systems
After a short review of the shot noise properties at a regular metallic junction and of the Keldysh formalism, I will present our recent results for a junction between a metal and a superconductor driven by an periodic external drive (AC regime). In particular, I will discuss the impact of the shape of the pulses on the shot-noise, emphasizing the special properties
of Lorentzian pulses, i.e. the Levitons. Then, I will briefly discuss the situation of a Josephson junction, where a diode effect, i.e. an asymmetry between the positive and negative critical currents, appears when both time-reversal and inversion symmetries are broken. Finally, after a short review of the anyonic statistics of the (edge) excitations in fractional quantum Hall systems, I will explain their impact in Hong-Ou-Mandel like experiments performed in a Hall bar geometry with a quantum point contact.
MajuLab is an international joint research unit of the CNRS, UCA, SU, NUS and NTU in Singapore (IRL 3654), hosted by CQT and SPMS.