Journal
PHYSICAL REVIEW B
Volume 78, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.060509
Keywords
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Funding
- NSF [DMR-0604406]
- DFG [Br118/118-1]
- DAAD [D/05/50420]
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We explain the recently observed linear temperature dependence of the nodal Fermi velocity upsilon(F)(T) in nearly optimally doped cuprates. We argue that it originates from electron-electron interaction and it is a fundamental property of an arbitrary two-dimensional (2D) Fermi liquid. We consider a spin-fermion model with input parameters extracted from the data, and we show that the T term is about 30% at 300 K, in agreement with the data. We show that the sub-leading term in upsilon(F)(T) is a regular (and small) T(2) correction. We also show that at a 2k(F) quantum-critical point, temperature corrections to the dispersion are singular.
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