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A "flat/steep band" scenario in momentum space

MPS-Authors
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Deng,  S.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280526

Simon,  A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280161

Köhler,  J.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Deng, S., Simon, A., & Köhler, J. (2004). A "flat/steep band" scenario in momentum space. Journal of Superconductivity, 17, 227-231.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FA17-F
Abstract
Based on chemical bonding considerations in a crystalline solid, a
Hamiltonian was proposed for the "flat/steep band" scenario. This model
has been studied with the first-principles method. With Hg and MgB2 as
examples, we have explained the characteristics of this model and
observed peak-like structure of the electron-phonon coupling constant
lambda(q) in q space. The strong coupling of the "flat band" electrons
with phonons has been corroborated by developing a new functional
Psib(Phi), through which we can quantitatively compare different
electronic states in coupling to a specific phonon. In the case of MgB2
a multigap structure of the superconducting state results from our
model.