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    “Spectroscopic Fingerprint of Phase Incoherent
       Superconductivity in the Pseudogap State of
                Underdoped Bi2Sr2CaCu2O8+δ”
  
♦Speaker : Dr. Jhinhwan Lee (Cornell University)
♦Place : Physics Seminar Room (Science Bldg, 3-201)
♦Date & Time : June, 10(Wed)바카라 먹튀2:00바카라 먹튀~바카라 먹튀3:00 pm

Abstract
  
One possible explanation for the mysterious ‘pseudogap’ state of the hole-doped cuprate superconductors
is that it is a d-wave superconductor바카라 먹튀but바카라 먹튀without바카라 먹튀quantum바카라 먹튀phase바카라 먹튀rigidity.바카라 먹튀While바카라 먹튀several바카라 먹튀transport바카라 먹튀and
thermodynamic studies indicate this to be true for some regions of the phase바카라 먹튀diagram,바카라 먹튀unanimity바카라 먹튀on바카라 먹튀the
extent of these regions is lacking. Thus the spectroscopic ‘fingerprint’ of phase incoherent superconductivity
would be invaluable to determine precisely where this state occurs. One spectroscopic signature of d-wave
superconductivity is the particle-hole symmetric ‘octet’ of dispersive Bogoliubov quasiparticle interference
(QPI) modulations. In this presentation I will report the temperature dependence of the complete QPI octet
from low temperatures to well into the pseudogap regime. Remarkably, we find no dramatic changes in the
QPI octet phenomenology at the superconductor’s critical temperature Tc and, indeed, show that it exists at
all temperatures up to at least T ~ 1.5Tc.바카라 먹튀Thus,바카라 먹튀our바카라 먹튀data provide direct spectroscopic evidence for phase
incoherent superconductivity in the underdoped바카라 먹튀pseudogap바카라 먹튀regime바카라 먹튀and바카라 먹튀also바카라 먹튀a바카라 먹튀new바카라 먹튀perspective on the
temperature evolution of바카라 먹튀the바카라 먹튀superconducting바카라 먹튀energy바카라 먹튀gap.바카라 먹튀Moreover,바카라 먹튀they바카라 먹튀reveal바카라 먹튀that바카라 먹튀the바카라 먹튀pseudogap
electronic structure consists바카라 먹튀of바카라 먹튀three바카라 먹튀distinct바카라 먹튀elements:바카라 먹튀the바카라 먹튀Fermi arc,바카라 먹튀the바카라 먹튀gap바카라 먹튀to바카라 먹튀coherent바카라 먹튀k-space
excitations of a phase disordered d-wave superconductor, and the gap to non-dispersive locally symmetry
breaking excitations at the pseudogap energy scale.바카라 먹튀I will also address in detail the technical challenges in
the high-precision variable-temperature QPI measurement and present a new cross-sectional QPI analysis
scheme that can be used to more accurately determine바카라 먹튀the바카라 먹튀Green’s바카라 먹튀function바카라 먹튀and바카라 먹튀the바카라 먹튀scattering바카라 먹튀matrix
elements. Together they will form the technological basis of mapping the Green’s function and the scattering
matrix elements over the entire phase diagram of an unknown material.

  
      Contact Person : Prof. Ki Bong Lee(054-279-2068, kibong@postech.ac.kr)


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