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Article

Novel energy scale in the interacting two-dimensional electron system evidenced from transport and thermodynamic measurements

Physical Review B: Condensed Matter and Materials Physics. 2016. Vol. 93. No. 23. P. 235145-1-235145-11.

We study how the non-Fermi-liquid two-phase state reveals itself in transport properties of high-mobility Si-MOSFETs.  We have found features in zero-field transport, magnetotransport, and thermodynamic spin magnetization in a 2D  correlated electron system  that may be directly related with the two-phase state. The features manifest above a  density dependent temperature T* that represents  a  novel high-energy scale, apart from the Fermi energy. More specifically,  in magnetoconductivity, we found a sharp onset of the {\cb novel} regime \delta \sigma(B,T) ~ (B/T)^2 above a density-dependent temperature T_{kink}(n),
a high-energy behavior that ``mimics'' the low-temperature diffusive interaction regime.  The zero-field  resistivity temperature dependence exhibits an inflection point  T_{infl}(n).  In thermodynamic magnetization, the weak-field spin susceptibility per electron, d \chi /d n changes  sign at T_{dM/dn}(n).   All three notable  temperatures, T_{kink}, T_{infl}, and T_{dM/dn}, behave critically  ~ (n-n_c),  are close to each other,  and are intrinsic to high-mobility samples solely; we therefore associate them
  with an   energy scale T* caused by interactions in the 2DE system.