Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Quantum-Critical Phenomena (joint session TT/DY)

TT 60.8: Vortrag

Donnerstag, 4. April 2019, 17:00–17:15, H23

Phase diagram of SU(N) Dirac fermions on the π-flux lattice with a bond-bond interaction — •Johannes S Hofmann, Martin Hohenadler, and Fakher F Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

We use auxiliary-field quantum Monte Carlo simulations to study the phase diagram of SU(N) Dirac fermions with a bond-bond interaction V similar to Ref. [1] and an associated O(2N) symmetry. In contrast to previous work, we consider a π-flux rather than a honeycomb lattice. The different coordination number is expected to favor antiferromagnetic (AFM) over valence bond solid (VBS) order. Accordingly, whereas AFM order is absent from the N-V phase diagram for N>2 in Ref. [1], we find an AFM phase up to N=3. Our results are consistent with Gross-Neveu semimetal-VBS transitions for N>1 and deconfined VBS-AFM quantum critical points for N=2 and N=3.
Z.-X. Li, Y.-F. Jiang, S.-K. Jian, and H. Yao, Nature Communications 8, 314 (2017)

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