Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-07-11
Proc. Natl. Acad. Sci. USA 102, 18824 -- 18829 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 4 figures; references added and typo in the critical exponent for the paramagnon case corrected; as published in PNA
Scientific paper
10.1073/pnas.0509519102
Considerable evidence exists for the failure of the traditional theory of quantum critical points (QCPs), pointing to the need to incorporate novel excitations. The destruction of Kondo entanglement and the concomitant critical Kondo effect may underlie these emergent excitations in heavy fermion metals -- a prototype system for quantum criticality -- but the effect remains poorly understood. Here, we show how ferromagnetic single-electron transistors can be used to study this effect. We theoretically demonstrate a gate-voltage induced quantum phase transition. The critical Kondo effect is manifested in a fractional-power-law dependence of the conductance on temperature ($T$). The AC conductance and thermal noise spectrum have related power-law dependences on frequency ($\omega$) and, in addition, show an $\omega/T$ scaling. Our results imply that the ferromagnetic nanostructure constitutes a realistic model system to elucidate magnetic quantum criticality that is central to the heavy fermions and other bulk materials with non-Fermi liquid behavior.
Kirchner Stefan
Natelson Douglas
Si Qimiao
Zhu Lijun
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