Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Quantum Impurities and Kondo Physics
TT 52.6: Talk
Thursday, April 4, 2019, 10:45–11:00, H7
Quantum Monte Carlo study of the SU( N) Kondo Lattice Model — •Marcin Raczkowski and Fakher Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
The two-dimensional half-filled Kondo lattice model with exchange J features a quantum phase transition which stems from the competition between the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction and the Kondo screening. Quantum Monte Carlo (QMC) simulations predict that below the magnetic energy scale TRKKY, the single-particle gap scales as J. This contrasts with an exponentially small gap in paramagnetic large-N and dynamical mean-field theories which omit spatial fluctuations. Here, we perform zero-temperature QMC simulations of the SU(N) symmetric Kondo lattice model and elucidate necessary conditions for recovering the large-N limit.