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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport
  • electron correlation, dynamical mean field theory
  • 2D materials, metal complexes

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Orbital Selective Fermi Surface Shifts and Mechanism of High Tc Superconductivity in Correlated AFeAs (A=Li, Na)

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Title
Orbital Selective Fermi Surface Shifts and Mechanism of High Tc Superconductivity in Correlated AFeAs (A=Li, Na)
Other Titles
Orbital Selective Fermi Surface Shifts and Mechanism of High Tc Superconductivity in Correlated AFeAs (A=Li, Na)
Author
Lee, GeunsikJi, Hyo SeokKim, YeongkwanKim, ChangyoungHaule, KristjanKotliar, GabrielLee, BumsungKhim, SeunghyunKim, Kee HoonKim, Kwang S.Kim, Ki-SeokShim, Ji Hoon
Keywords
IRON PNICTIDES; MAGNETISM; LIFEAS
Issue Date
2012-10
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.109, no.17, pp.177001 -
Abstract
Based on the dynamical mean field theory and angle resolved photoemission spectroscopy, we have investigated the mechanism of high T-c superconductivity in stoichiometric LiFeAs. The calculated spectrum is in excellent agreement with the measured angle resolved photoemission spectroscopy. The Fermi surface (FS) nesting, which is predicted in the conventional density functional theory method, is suppressed due to the orbital-dependent correlation effect within the dynamical mean field theory method. We have shown that such marginal breakdown of the FS nesting is an essential condition to the spin-fluctuation mediated superconductivity, while the good FS nesting in NaFeAs induces a spin density wave ground state. Our results indicate that a fully charge self-consistent description of the correlation effect is crucial in the description of the FS nesting-driven instabilities.
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DOI
10.1103/PhysRevLett.109.177001
ISSN
0031-9007
Appears in Collections:
PHY_Journal Papers
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