5 citations · 10 across the 4 of their papers we have counts for
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Parameterized Families of Toric Code Phase: -duality family and higher-order anyon pumping
Shuhei Ohyama, Takamasa Ando, Ryan Thorngren
Within the toric-code phase, we study parameterized families of topologically ordered states. We construct - and -parameter families of local Hamiltonians and confirm their n…
Symmetry Spans and Enforced Gaplessness
Takamasa Ando, Kantaro Ohmori
Anomaly matching for continuous symmetries has been the primary tool for establishing symmetry enforced gaplessness - the phenomenon where global symmetry alone forces a quantum sy…
Gauge theory and mixed state criticality
Takamasa Ando, Shinsei Ryu, Masataka Watanabe
In mixed quantum states, the notion of symmetry is divided into two types: strong and weak symmetry. While spontaneous symmetry breaking (SSB) for a weak symmetry is detected by tw…
Self--ality in 1+1 dimensions
Takamasa Ando
We explore topological manipulations in one spatial dimension, which are defined for a system with a global symmetry and map the system to another one with a dual symmetry. In part…
Gauging on the lattice and gapped/gapless topological phases
Takamasa Ando
In this work, we explore topological phases of matter obtained by effectively gauging or fermionizing a system, where the Gauss law constraint is only enforced energetically. In co…