Authors: Chanda, Titas; Lewenstein, Maciej; Zakrzewski, Jakub; Tagliacozzo, Luca


Publication date: 2022/02/28

DOI: 10.1103/PhysRevLett.128.090601

Abstract: We determine the phase diagram of the Abelian-Higgs model in one spatial dimension and time (1 + 1D) on a lattice. We identify a line of first order phase transitions separating the Higgs region from the confined one. This line terminates in a quantum critical point above which the two regions are connected by a smooth crossover. We analyze the critical point and find compelling evidence for its description as the product of two noninteracting systems: a massless free fermion and a massless free boson. However, we find also some surprising results that cannot be explained by our simple picture, suggesting this newly discovered critical point is an unusual one.