期刊
SCIENCE
卷 367, 期 6475, 页码 285-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aag1595
关键词
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资金
- 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
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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