F
Fred Chen
Guest
There has been some discussion on shot noise, which ultimately
referred to Art of Electronics 2nd ed. ch 7.11. The "current in a
simple resistive circuit has far less noise than predicted by the
shot-noise formula." I have not looked into this issue for a while but
reading up on stuff I could get my hands on, it looks like
electron-phonon interaction length is short enough at room temperature
to guarantee that electrons thermalize with the metal lattice, thus
enabling the shot noise to be suppressed. The interesting bit is when
the resistor length drops below the electron-phonon length, as long as
transport is not ballistic, the shot noise is only partially
suppressed (factor of 1/3 for the independent hot electron case and
sqrt(3)/4 for the interacting hot electron case).
Fred
referred to Art of Electronics 2nd ed. ch 7.11. The "current in a
simple resistive circuit has far less noise than predicted by the
shot-noise formula." I have not looked into this issue for a while but
reading up on stuff I could get my hands on, it looks like
electron-phonon interaction length is short enough at room temperature
to guarantee that electrons thermalize with the metal lattice, thus
enabling the shot noise to be suppressed. The interesting bit is when
the resistor length drops below the electron-phonon length, as long as
transport is not ballistic, the shot noise is only partially
suppressed (factor of 1/3 for the independent hot electron case and
sqrt(3)/4 for the interacting hot electron case).
Fred