170 citations · 1.4k across the 25 of their papers we have counts for
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Partial time-reversal transformation and entanglement negativity in fermionic systems
Hassan Shapourian, Ken Shiozaki, Shinsei Ryu
The partial transpose of density matrices in many-body quantum systems, in which one takes the transpose only for a subsystem of the full Hilbert space, has been recognized as a us…
Many-body topological invariants in fermionic symmetry protected topological phases: Cases of point group symmetries
Ken Shiozaki, Hassan Shapourian, Shinsei Ryu
We propose the definitions of many-body topological invariants to detect symmetry-protected topological phases protected by point group symmetry, using partial point group transfor…
Dynamical renormalization group approach to the spin-boson model
Hassan Shapourian
We develop a semi-analytical approach beyond the Born-Markov approximation to study the quench dynamics of the spin-boson model in the strong-coupling regime () for the O…
Many-body topological invariants for fermionic symmetry-protected topological phases
Hassan Shapourian, Ken Shiozaki, Shinsei Ryu
We define and compute many-body topological invariants of interacting fermionic symmetry-protected topological phases, protected by an orientation-reversing symmetry, such as time-…