Related Experiment Video
Updated: May 16, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Nonequilibrium BCS state dynamics induced by intense terahertz pulses in a superconducting NbN film
Ryusuke Matsunaga1, Ryo Shimano
1Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan.
Abstract:
Using terahertz (THz) pump-THz probe spectroscopy, we have investigated the dynamics of the nonequilibrium BCS state in a superconducting NbN film after the impulsive photoinjection of high-density Bogoliubov quasiparticles. The superconducting state rapidly changes within the duration of the monocycle THz pump pulse (1.6 ps). The complex optical conductivity spectrum in the nonequilibrium BCS state significantly deviates from that in the equilibrium state. The observed spectral features are qualitatively well described by the effective medium theory that assumes the formation of normal state patches embedded in a superconducting matrix.
Related Concept Videos
Atomic Nuclei: Nuclear Relaxation Processes
Atomic Nuclei: Nuclear Spin State Population Distribution
Carrier Generation and Recombination
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
P-N junction

