Electron-Phonon Interactions at milli-Kelvin Temperatures and Ultra-Sensitive Detectors of Far-IR Radiation
Department of Physics and Astronomy
Understanding of the electron-phonon interaction in disordered and
low-dimensional conductors is crucial for both fundamental research and
electronic device applications. We carry out systematic measurements of the
electron-phonon scattering time in thin-film metal
structures by means of hot-electron experiments at milli-Kelvin
temperatures. The applied aspects of this research involve the
development of ultra-sensitive hot-electron detectors of submillimeter and
far-infra-red electromagnetic radiation for the deep-space NASA missions (in
collaboration with the Jet Propulsion Lab).
Selected Publications:
B. S. Karasik, A. V. Sergeyev, D. Olaya, J. Wei, M. E. Gershenson, J. H. Kawamura, and W. R. McGrath, “A Photon Counting Hot-Electron Bolometer for Space THz Spectroscopy” Proc. 16th Int.Symp. on Space Terahertz Technol., May 2-4, 2005, Gothenburg, Sweden, pp. 543-548
A. V. Sergeev, V. V. Mitin, B. S. Karasik, and M. E. Gershenson, Superconducting nanosensors with mesoscopic number of quasiparticles, Physica E 19, 173-177 (2003).
M. E. Gershenson, D. Gong, T. Sato, B. S. Karasik, and A. V. Sergeev. Millisecond electron-phonon relaxation in ultrathin disordered metal films at millikelvin temperatures. Appl. Phys. Lett. 79, 2049 (2001).