스포츠 토토 판매점PHYSICS/BK21 SEMINAR[09.06.10 ]pm2:00~
관련링크
본문
"
“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)스포츠 토토 판매점2:00스포츠 토토 판매점~스포츠 토토 판매점3:00 pm
Abstract
One possible explanation for the mysterious ‘pseudogap’ state of the hole-doped cuprate superconductors
is that it is a d-wave superconductor스포츠 토토 판매점but스포츠 토토 판매점without스포츠 토토 판매점quantum스포츠 토토 판매점phase스포츠 토토 판매점rigidity.스포츠 토토 판매점While스포츠 토토 판매점several스포츠 토토 판매점transport스포츠 토토 판매점and
thermodynamic studies indicate this to be true for some regions of the phase스포츠 토토 판매점diagram,스포츠 토토 판매점unanimity스포츠 토토 판매점on스포츠 토토 판매점the
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.스포츠 토토 판매점Thus,스포츠 토토 판매점our스포츠 토토 판매점data provide direct spectroscopic evidence for phase
incoherent superconductivity in the underdoped스포츠 토토 판매점pseudogap스포츠 토토 판매점regime스포츠 토토 판매점and스포츠 토토 판매점also스포츠 토토 판매점a스포츠 토토 판매점new스포츠 토토 판매점perspective on the
temperature evolution of스포츠 토토 판매점the스포츠 토토 판매점superconducting스포츠 토토 판매점energy스포츠 토토 판매점gap.스포츠 토토 판매점Moreover,스포츠 토토 판매점they스포츠 토토 판매점reveal스포츠 토토 판매점that스포츠 토토 판매점the스포츠 토토 판매점pseudogap
electronic structure consists스포츠 토토 판매점of스포츠 토토 판매점three스포츠 토토 판매점distinct스포츠 토토 판매점elements:스포츠 토토 판매점the스포츠 토토 판매점Fermi arc,스포츠 토토 판매점the스포츠 토토 판매점gap스포츠 토토 판매점to스포츠 토토 판매점coherent스포츠 토토 판매점k-space
excitations of a phase disordered d-wave superconductor, and the gap to non-dispersive locally symmetry
breaking excitations at the pseudogap energy scale.스포츠 토토 판매점I 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 determine스포츠 토토 판매점the스포츠 토토 판매점Green’s스포츠 토토 판매점function스포츠 토토 판매점and스포츠 토토 판매점the스포츠 토토 판매점scattering스포츠 토토 판매점matrix
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)
"
“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)스포츠 토토 판매점2:00스포츠 토토 판매점~스포츠 토토 판매점3:00 pm
Abstract
One possible explanation for the mysterious ‘pseudogap’ state of the hole-doped cuprate superconductors
is that it is a d-wave superconductor스포츠 토토 판매점but스포츠 토토 판매점without스포츠 토토 판매점quantum스포츠 토토 판매점phase스포츠 토토 판매점rigidity.스포츠 토토 판매점While스포츠 토토 판매점several스포츠 토토 판매점transport스포츠 토토 판매점and
thermodynamic studies indicate this to be true for some regions of the phase스포츠 토토 판매점diagram,스포츠 토토 판매점unanimity스포츠 토토 판매점on스포츠 토토 판매점the
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.스포츠 토토 판매점Thus,스포츠 토토 판매점our스포츠 토토 판매점data provide direct spectroscopic evidence for phase
incoherent superconductivity in the underdoped스포츠 토토 판매점pseudogap스포츠 토토 판매점regime스포츠 토토 판매점and스포츠 토토 판매점also스포츠 토토 판매점a스포츠 토토 판매점new스포츠 토토 판매점perspective on the
temperature evolution of스포츠 토토 판매점the스포츠 토토 판매점superconducting스포츠 토토 판매점energy스포츠 토토 판매점gap.스포츠 토토 판매점Moreover,스포츠 토토 판매점they스포츠 토토 판매점reveal스포츠 토토 판매점that스포츠 토토 판매점the스포츠 토토 판매점pseudogap
electronic structure consists스포츠 토토 판매점of스포츠 토토 판매점three스포츠 토토 판매점distinct스포츠 토토 판매점elements:스포츠 토토 판매점the스포츠 토토 판매점Fermi arc,스포츠 토토 판매점the스포츠 토토 판매점gap스포츠 토토 판매점to스포츠 토토 판매점coherent스포츠 토토 판매점k-space
excitations of a phase disordered d-wave superconductor, and the gap to non-dispersive locally symmetry
breaking excitations at the pseudogap energy scale.스포츠 토토 판매점I 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 determine스포츠 토토 판매점the스포츠 토토 판매점Green’s스포츠 토토 판매점function스포츠 토토 판매점and스포츠 토토 판매점the스포츠 토토 판매점scattering스포츠 토토 판매점matrix
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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