Quantum spin liquids may be considered'quantum disordered'ground states of spin systems,
in which zero-point fluctuations are so strong that they prevent conventional magnetic long …

For decades, frustrated quantum magnets have been a seed for scientific progress and
innovation in condensed matter. As much as the numerical tools for low-dimensional …

Numerical results for ground-state and excited-state properties (energies, double
occupancies, and Matsubara-axis self-energies) of the single-orbital Hubbard model on a …

We propose a systematic approach to the nonequilibrium dynamics of strongly interacting
many-body quantum systems, building upon the standard perturbative expansion in the …

The pseudofermion representation for S= 1/2 quantum spins introduces unphysical states in
the Hilbert space, which can be projected out using the Popov-Fedotov trick. However, state …

The study of warm dense matter, widely existing in nature and laboratories, is challenging
due to the interplay of quantum and classical fluctuations. We develop a variational …

We introduce the first bold diagrammatic Monte Carlo approach to deal with polaron
problems at a finite electron density nonperturbatively, ie, by including vertex corrections to …

The dual fermion approach provides a formally exact prescription for calculating properties
of a correlated electron system in terms of a diagrammatic expansion around dynamical …

We study the low-temperature physics of the SU (2)-symmetric spin-1/2 Heisenberg
antiferromagnet on a pyrochlore lattice and find “fingerprint” evidence for the thermal spin …

We demonstrate, by considering the triangular lattice spin-1/2 Heisenberg model, that Monte
Carlo sampling of skeleton Feynman diagrams within the fermionization framework offers a …