%0 Journal Article %1 Plumb2010 %A Plumb, N. C. %A Reber, T. J. %A Koralek, J. D. %A Sun, Z. %A Douglas, J. F. %A Aiura, Y. %A Oka, K. %A Eisaki, H. %A Dessau, D. S. %D 2010 %I American Physical Society %J Phys. Rev. Lett. %K imported myown %N 4 %P 046402 %R 10.1103/PhysRevLett.105.046402 %T Low-Energy ($<10$ meV) Feature in the Nodal Electron Self-Energy and Strong Temperature Dependence of the Fermi Velocity in Bi$_2$Sr$_2$CaCu$_2$O$_8+\delta$ %V 105 %X Using low photon energy angle-resolved photoemission, we study the low-energy dispersion along the nodal (π,π) direction in Bi2Sr2CaCu2O8+δ as a function of temperature. Less than 10 meV below the Fermi energy, the high-resolution data reveal a novel “kinklike” feature in the electron self-energy that is distinct from the larger well-known kink roughly 70 meV below EF. This new kink is strongest below the superconducting critical temperature and weakens substantially at higher temperatures. A corollary of this finding is that the Fermi velocity vF, as measured in this low-energy range, varies rapidly with temperature—increasing by almost 30% from 70 to 110 K. The behavior of vF(T) appears to shift as a function of doping, suggesting a departure from simple “universality” in the nodal Fermi velocity of cuprates.

@article{Plumb2010, abstract = {Using low photon energy angle-resolved photoemission, we study the low-energy dispersion along the nodal (π,π) direction in Bi2Sr2CaCu2O8+δ as a function of temperature. Less than 10 meV below the Fermi energy, the high-resolution data reveal a novel “kinklike” feature in the electron self-energy that is distinct from the larger well-known kink roughly 70 meV below EF. This new kink is strongest below the superconducting critical temperature and weakens substantially at higher temperatures. A corollary of this finding is that the Fermi velocity vF, as measured in this low-energy range, varies rapidly with temperature—increasing by almost 30% from 70 to 110 K. The behavior of vF(T) appears to shift as a function of doping, suggesting a departure from simple “universality” in the nodal Fermi velocity of cuprates.}, added-at = {2010-11-06T00:14:39.000+0100}, author = {Plumb, N. C. and Reber, T. J. and Koralek, J. D. and Sun, Z. and Douglas, J. F. and Aiura, Y. and Oka, K. and Eisaki, H. and Dessau, D. S.}, biburl = {https://www.bibsonomy.org/bibtex/25965d62484edae31a8dbfa268b0ada72/nplumb}, doi = {10.1103/PhysRevLett.105.046402}, file = {:C\:\\Users\\Nick\\Documents\\Papers\\Plumb et al. - Low-energy (10 meV) feature in the nodal electron self-energy and strong temperature dependence of the Fermi velocity in Bi2212.pdf:PDF}, interhash = {b55086d2745b94be87bf2464c0d21d29}, intrahash = {5965d62484edae31a8dbfa268b0ada72}, journal = {Phys. Rev. Lett.}, keywords = {imported myown}, month = Jul, number = 4, numpages = {4}, owner = {Nick}, pages = 046402, publisher = {American Physical Society}, timestamp = {2010-11-06T04:59:07.000+0100}, title = {Low-Energy ($<10$ meV) Feature in the Nodal Electron Self-Energy and Strong Temperature Dependence of the Fermi Velocity in Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$}, volume = 105, year = 2010 }