792 citations · 5.2k across the 61 of their papers we have counts for
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Proof of the absence of long-range temporal orders in Gibbs states
Haruki Watanabe, Masaki Oshikawa, Tohru Koma
We address the question whether time translation symmetry can be spontaneously broken in a quantum many-body system. One way of detecting such a symmetry breaking is to examine the…
Refined symmetry indicators for topological superconductors in all space groups
Seishiro Ono, Hoi Chun Po, Haruki Watanabe
Topological superconductors are exotic phases of matter featuring robust surface states that could be leveraged for topological quantum computation. A useful guiding principle for…
Quantum Quench and -Sum Rules on Linear and Non-linear Conductivities
Masaki Oshikawa, Haruki Watanabe
Considering a quench process in which an electric field pulse is applied to the system, "-sum rule" for the conductivity for general quantum many-particle systems is derived. It…
Geometric orbital magnetization in adiabatic processes
Luka Trifunovic, Seishiro Ono, Haruki Watanabe
We consider periodic adiabatic processes of gapped many-body spinless electrons. We find an additional contribution to the orbital magnetization due to the adiabatic time evolution…
A proof of the Bloch theorem for lattice models
Haruki Watanabe
The Bloch theorem is a powerful theorem stating that the expectation value of the U(1) current operator averaged over the entire space vanishes in large quantum systems. The theore…
Counting Rules of Nambu-Goldstone Modes
Haruki Watanabe
When global continuous symmetries are spontaneously broken, there appear gapless collective excitations called Nambu-Goldstone modes (NGMs) that govern the low-energy property of t…
Difficulties in operator-based formulation of the bulk quadrupole moment
Seishiro Ono, Luka Trifunovic, Haruki Watanabe
Electric multipole moments are the most fundamental properties of insulating materials. However, the general formulation of bulk multipoles has been a long standing problem. The so…