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By analyzing the in-plane field magnetoconductivity, zero field transport,and thermodynamic spin magnetization in 2D correlated electron system in highmobility Si-MOS samples, we have revealed a novel high energy scale $T^*$,beyond the Fermi energy. In magnetoconductivity, we found a sharp onset of thenovel regime $\delta \sigma(B,T) \propto (B/T)^2$ above a density dependenttemperature $T_{\rm kink}(n)$, the high-energy behavior that "mimics" thelow-temperature diffusive interaction regime. The zero field resistivitytemperature dependence exhibits an inflection point $T_{\rm infl}$. Inthermodynamic magnetization, the weak field spin susceptibility per electron,$\partial \chi /\partial n$ changes sign at $T_{dM/d n}$. All three notabletemperatures, $T_{\rm kink}$, $T_{\rm infl}$, and $T_{d M/ d n}$, behavecritically $\propto (n-n_c)$, are close to each other, and are intrinsic tohigh mobility samples only; we therefore associate them with a novel energyscale $T^*$ caused by interactions in the 2DE system.

Novel Energy Scale in the Interacting 2D Electron System Evidenced from Transport and Thermodynamic Measurements