TY  - CONF
AU  - Funcke, Lena
AU  - Jansen, Karl
AU  - Kühn, Stefan
TI  - CP-violating Dashen phase transition in the two-flavor Schwinger model: a study with matrix product states
JO  - Proceedings of Science / International School for Advanced Studies
VL  - (LATTICE2021)
IS  - arXiv:2110.15642
SN  - 1824-8039
CY  - Trieste
PB  - SISSA
M1  - PUBDB-2022-01003
M1  - arXiv:2110.15642
M1  - MIT-CTP/5348
T2  - 1956017
SP  - 552
PY  - 2021
N1  - 9 pages, 3 figures, proceedings of the 38th International Symposium on Lattice Field Theory, 26th-30th July 2021, Zoom/Gather@Massachusetts Institute of Technology, version 2: updated funding information
AB  - We numerically study the Hamiltonian lattice formulation of the two-flavor Schwinger model using matrix product states. Keeping the mass of the first flavor at a fixed positive value, we tune the mass of the second flavor through a range of negative values, thus exploring a regime where conventional Monte Carlo methods suffer from the sign problem and may run into instabilities due to zero modes. Our results indicate a phase transition at the point where the absolute value of the second flavor mass approaches the first flavor mass. The phase transition is accompanied by the formation of a fermion condensate, a steep drop of the average electric field, and a peak in the bipartite entanglement entropy. Our data hints at a second order transition, which is the 1+1D analog of the CP-violating Dashen phase transition in QCD.
T2  - 38th International Symposium on Lattice Field Theory,
CY  - 26 Jul 2021 - 31 Jul 2021, Zoom/Gather@Massachusetts (USA)
Y2  - 26 Jul 2021 - 31 Jul 2021
M2  - Zoom/Gather@Massachusetts, USA
KW  - CP: violation (INSPIRE)
KW  - fermion: condensation (INSPIRE)
KW  - entropy: entanglement (INSPIRE)
KW  - critical phenomena (INSPIRE)
KW  - flavor (INSPIRE)
KW  - Schwinger model (INSPIRE)
KW  - quantum chromodynamics (INSPIRE)
KW  - zero mode (INSPIRE)
KW  - Hamiltonian (INSPIRE)
KW  - stability (INSPIRE)
KW  - lattice (INSPIRE)
KW  - electric field (INSPIRE)
KW  - formation (INSPIRE)
KW  - Monte Carlo (INSPIRE)
LB  - PUB:(DE-HGF)16 ; PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
DO  - DOI:10.22323/1.396.0552
UR  - https://bib-pubdb1.desy.de/record/474796
ER  -