10 citations · 26 across the 15 of their papers we have counts for
13 papers · 1 filter
Absence of nontrivial local conserved quantities in a class of -symmetric spin-1 chains
Shunsuke Sengoku, Haruki Watanabe
We prove the absence of nontrivial local conserved quantities in a class of -symmetric spin- chains with nearest-neighbor interactions in which some of the quadrupolar cou…
Distinct finite-temperature phase diagrams of non-invertible Kennedy--Tasaki duals
Weiguang Cao, Haruki Watanabe
Do two Hamiltonians related by a non-invertible transformation necessarily share the same finite-temperature phase diagram? For a cluster-model interpolation and its Kennedy…
Quantized topological invariant of symmetry-projected Gibbs states
Weiguang Cao, Haruki Watanabe
We study Gibbs states projected onto the symmetric sector of contractible one-form symmetries. In a three-dimensional cluster-model interpolation, this projection stabilizes symmet…
Gibbs-state phases beyond microscopic symmetry breaking: A phase invariant for the 3D toric code
Haruki Watanabe
Do phases of Gibbs states admit a classification beyond symmetry breaking? We study the three-dimensional toric code with transverse and longitudinal fields that explicitly break b…
Topological Phase Transitions and Their Thermodynamic Fate in Arbitrary- Classical Pyrochlore Spin Ice
Sena Watanabe, Yukitoshi Motome, Haruki Watanabe
We develop a self-contained theoretical framework that classifies the topological phases and critical phenomena of classical pyrochlore magnets with arbitrary spin , subject to…
Monte Carlo Study of the Phase Transition of the Model on a Diamond Lattice
Sena Watanabe, Yukitoshi Motome, Haruki Watanabe
We study the phase transition of the classical model on a diamond lattice by Monte Carlo simulations using the Wolff cluster algorithm. Finite-size scaling (FSS) analysis of t…
Continuous crossover between high-pressure ice phases VII and X driven by monopole screening: a model study
Sena Watanabe, Yukitoshi Motome, Haruki Watanabe
The proton-disordered molecular phase of water ice (ice-VII) and its ultrahigh-pressure non-molecular phase (ice-X) share identical macroscopic crystal symmetry (space group $Pn\ba…
Dualities and Topological Classification of the Pyrochlore Spin Ice
Sena Watanabe, Yukitoshi Motome, Haruki Watanabe
We derive dual descriptions of the trivial paramagnetic, -deconfined, and -confined U(1) Coulomb phases of the pyrochlore spin ice. In the monopol…
Quasi-local Frustration-Free Free Fermions
Shunsuke Sengoku, Hoi Chun Po, Haruki Watanabe
Recent studies have revealed that frustration-free models, expressed as sums of finite-range interactions or hoppings, exhibit several properties markedly different from those of f…
Frustration-free free fermions
Seishiro Ono, Rintaro Masaoka, Haruki Watanabe +1
We develop a general theory of frustration-free free-fermion systems and derive the necessary and sufficient conditions for such Hamiltonians. Assuming locality and translation inv…
Frustration-free free fermions and beyond
Rintaro Masaoka, Seishiro Ono, Hoi Chun Po +1
Frustration-free Hamiltonians provide pivotal models for understanding quantum many-body systems. In this paper, we establish a general framework for frustration-free fermionic sys…
Rigorous lower bound on dynamical exponents in gapless frustration-free systems
Rintaro Masaoka, Tomohiro Soejima, Haruki Watanabe
This work rigorously establishes a universal lower bound for the dynamical exponent in frustration-free quantum many-body systems whose ground states exhibit power-law deca…
Quadratic dispersion relations in gapless frustration-free systems
Rintaro Masaoka, Tomohiro Soejima, Haruki Watanabe
Recent case-by-case studies revealed that the dispersion of low energy excitations in gapless frustration-free Hamiltonians is often quadratic or softer. In this work, we argue tha…