Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.176404
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Funding
- National Science Foundation [DMR-0907179]
- Aspen Center for Physics [1066293]
- DOE [DE-AC02-98 CH 10886]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0907179] Funding Source: National Science Foundation
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We propose a model for the intrinsic quantum criticality of beta-YbAlB4, in which a vortex in momentum space gives rise to a new type of Fermi surface singularity. The unquenched angular momentum of the [J = 7/2; m(J) = +/- 5/2 > Yb 4f states generates a momentum-space line defect in the hybridization between 4f and conduction electrons, leading to a quasi-two-dimensional Fermi surface with a k(perpendicular to)(4) dispersion and a singular density of states proportional to E-1/2. We discuss the implications of this line node in momentum space for our current understanding of quantum criticality and its interplay with topology.
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