Bond bipolarons: Sign-free Monte Carlo approach

Chao Zhang,1 Nikolay V. Prokof’ev,2 and Boris V. Svistunov2, 3, 4 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA National Research “Center Kurchatov Institute,” 123182 Moscow, Russia Wilczek Quantum Center, School of Physics and Astronomy and T. D. Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China