9 citations · 17 across the 6 of their papers we have counts for
4 papers · 1 filter
Interacting quantum criticality with U(1) symmetry breaking in 1+1 dimensions
Mutsumi Shimomura, Kohei Kawabata
The Hohenberg-Mermin-Wagner theorem motivates the expectation that continuous symmetry remains unbroken in one-dimensional quantum ground states. Here, contrary to this expectation…
Chiral quantum chaos around exponentially many zero modes in the quantum breakdown model
Kohei Kawabata, Kinya Guan, Hosho Katsura
The quantum breakdown model is a model of randomly interacting fermions, motivated by the physics of dielectric breakdown. Here, we establish classification of symmetry and quantum…
Exact probability distributions of complex spacing ratios in non-Hermitian random matrices
Kohei Kawabata
The complex spacing ratio is the complex displacement from a reference eigenvalue to its nearest neighbor divided by the corresponding displacement to its next-to-nearest neighbor.…
Complex nonlinear sigma model
Kazuki Yamamoto, Kohei Kawabata
Motivated by the recent interest in the criticality of open quantum many-body systems, we study nonlinear sigma models with complexified couplings as a general framework for nonuni…