Journal
SCIENCE
Volume 367, Issue 6475, Pages 285-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aag1595
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Funding
- European Research Council (ERC) [227378]
- U.S. Army Research Office [ARO W911NF-14-1-0496]
- Austrian Science Fund [FWF W1243 P29279-N27, P29296-N27]
- European Union [824109-EMP]
- National Science Foundation [NSF MRSEC DMR-1720595]
- ARO [W911NF-17-1-0259, W911NF-14-1-0525]
- NSF [DMR-1920740]
- Robert A.Welch Foundation [C-1411]
- University of California at Berkeley the Aspen Center for Physics(NSF) [PHY-1607611]
- Los Alamos National Laboratory (Ulam Scholarship from the Center for Nonlinear Studies)
- Inter Disciplinary Excellence Award (IDEA)from Rice University
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Strange metal behavior is ubiquitous in correlated materials, ranging from cuprate superconductors to bilayer graphene, and may arise from physics beyond the quantum fluctuations of a Landau order parameter. In quantum-critical heavy-fermion antiferromagnets, such physics may be realized as critical Kondo entanglement of spin and charge and probed with optical conductivity. We present terahertz time-domain transmission spectroscopy on molecular beam epitaxy-grown thin films of YbRh2Si2, a model strange-metal compound. We observed frequency over temperature scaling of the optical conductivity as a hallmark of beyond-Landau quantum criticality. Our discovery suggests that critical charge fluctuations play a central role in the strange metal behavior, elucidating one of the long-standing mysteries of correlated quantum matter.
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