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At low temperatures, the transport coefficients in the disordered electrongas acquire quantum corrections as a result of the complex interplay ofdisorder and interactions. The interaction corrections to the electricconductivity have their origin in virtual processes with typical electronicenergies far exceeding the temperature. Here, we study interaction corrections$\delta S$ to the thermopower $S$ of the two-dimensional disordered electrongas with long-range Coulomb interactions. We show that while both real andvirtual processes contribute to these corrections, the real processes aredominant and lead to a logarithmic temperature dependence of $\delta S/S$ with$\delta S/S<0$.

Interaction corrections to the thermopower of the disordered two-dimensional electron gas