Indication of band flattening at the Fermi level in a strongly correlated electron system

M. Yu. Melnikov, A. A. Shashkin, V. T. Dolgopolov +3

Using ultra-high quality SiGe/Si/SiGe quantum wells at millikelvin temperatures, we experimentally compare the energy-averaged effective mass, $m$, with that at the Fermi level, $m…