Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.41: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Spectral function of a quantum dimer model for the pseudogap metal — •Sebastian Huber and Matthias Punk — Arnold Sommerfeld Center, Ludwig-Maximilians University, 80333 Munich, Germany

We study a quantum dimer model [1,2], which describes several key properties of the pseudogap phase of hole-doped cuprates at low hole density p. The configurations of the system are built from two species of dimers: Fermionic dimers that carry spin S = 1/2 and charge +e embedded in a neutral background of bosonic spin singlet dimers.
We compute electron spectral functions using exact diagonalization on lattices of size 6x6 and find clear signature of the so-called pseudogap at the antinode in momentum space.
In a second part we show how to implement a cluster dynamical mean-field approach in order to calculate spectral properties of the quantum dimer model with higher resolution. The cluster impurity problem is solved using the numerical renormalization group technique.

[1] D. S. Rokhsar and S. A. Kivelson, PRL 61, 20 (1988)

[2] M. Punk, A. Allais and S. Sachdev, PNAS 112, 31 (2015)