Quantum critical behavior of electrons at the edge of charge order

Details Quantum critical behavior of electrons at the edge of charge order Quantum critical behavior of electrons at the edge of charge order

2010-05-12

arxiv.org/abs/1005.2106v2

Phys. Rev. Lett. 105, 036405 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

We consider quantum critical points (QCP) in which quantum fluctuations associated with charge rather than magnetic order induce unconventional metallic properties. Based on finite-T calculations on a two-dimensional extended Hubbard model we show how the coherence scale T* characteristic of Fermi liquid behavior of the homogeneous metal vanishes at the onset of charge order. A strong effective mass enhancement reminiscent of heavy fermion behavior indicates the possible destruction of quasiparticles at the QCP. Experimental probes on quarter-filled layered organic materials are proposed for unveiling the behavior of electrons across the quantum critical region.

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