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The quantum critical point (QCP) in $YbRh_{2}Si_{2}$ is an enigma for theitinerant view of QCP. In an alternative view, this QCP is intimately linked tothe selective Mott localization of the heavy $f$ electrons. Following a perusalof this unusual QCP, I study an Extended Periodic Anderson Model (EPAM) withinDMFT. A quantum phase transition (FQPT), accompanied by a rapid change in theFermi volume, is found near the quantum-critical end-point of the selectiveMott transition in the $f$-electron sector. The theory accounts for a widerange of unusual, singular non-Fermi liquid features exhibited at this QCP in$YbRh_{2}Si_{2}$ in a natural way.

On Field-Induced Quantum Criticality in YbRh_{2}Si_[2}