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Using ultra-high quality SiGe/Si/SiGe quantum wells at millikelvintemperatures, we experimentally compare the energy-averaged effective mass,$m$, with that at the Fermi level, $m_F$, and verify that the behaviours ofthese measured values are qualitatively different. With decreasing electrondensity (or increasing interaction strength), the mass at the Fermi levelmonotonically increases in the entire range of electron densities, while theenergy-averaged mass saturates at low densities. The qualitatively differentbehaviour reveals a precursor to the interaction-induced single-particlespectrum flattening at the Fermi level in this electron system.

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