Multiloop pseudofermion functional renormalization for quantum spin systems: Application to the spin-$\frac{1}{2}$ kagome Heisenberg model

Julian Thoenniss, Marc K. Ritter, Fabian B. Kugler +2

We present a multiloop pseudofermion functional renormalization group (pffRG) approach to quantum spin systems. As a test case, we study the spin-$\frac{1}{2}$ Heisenberg model on…