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Résumé |
The selective destruction of coherent quasiparticle excitations in
the "antinodal" region of momentum-space is a striking property of
the normal state of underdoped cuprate superconductors, and a key
challenge for theory. In this talk, I will review a recent attempt
to understand this phenomenon from a minimal cluster extension of
the dynamical mean-field theory, based on a valence bond self-
consistently embedded in a effective medium. I will show that the
destruction of quasiparticles at the antinodes, the opening of a
pseudogap, and the formation of Fermi arcs, can be viewed as an
orbital-selective Mott transition in momentum-space. Comparison to
tunneling and angular-resolved photoemission experimental data will
be discussed. |
