We measured the non-radiative intersubband relaxation time in n-type modulation-doped Ge/SiGe multi-quantum wells of different thickness by means of degenerate pump-probe experiments. The photon energy was tuned to be resonant with the lowest conduction band intersubband transition energy (14-29 meV), as measured by terahertz absorption spectroscopy and in agreement with band structure calculations. Temperature-independent lifetimes in excess of 30 ps were observed.
|Autori:||Ortolani M; Stehr D; Wagner M; Helm M; Pizzi G; Virgilio M; Grosso G; Capellini G; De Seta M|
|Titolo:||Long intersubband relaxation times in n-type germanium quantum wells|
|Anno del prodotto:||2011|
|Digital Object Identifier (DOI):||10.1063/1.3662394|
|Appare nelle tipologie:||1.1 Articolo in rivista|