24 citations · 29 across the 2 of their papers we have counts for
21 papers
Adiabatic transport in one-dimensional systems with a single defect
Kazuaki Takasan, Masaki Oshikawa, Haruki Watanabe
The adiabatic transport properties of U(1) invariant systems are determined by the dependence of the ground state energy on the twisted boundary condition. We examine a one-dimensi…
Fractional corner magnetization of collinear antiferromagnets
Haruki Watanabe, Yasuyuki Kato, Hoi Chun Po +1
Recent studies revealed that the electric multipole moments of insulators result in fractional electric charges localized to the hinges and corners of the sample. We here explore t…
Corner charge and bulk multipole moment in periodic systems
Haruki Watanabe, Seishiro Ono
A formula for the corner charge in terms of the bulk quadrupole moment is derived for two-dimensional periodic systems. This is an analog of the formula for the surface charge dens…
qeirreps: an open-source program for Quantum ESPRESSO to compute irreducible representations of Bloch wavefunctions
Akishi Matsugatani, Seishiro Ono, Yusuke Nomura +1
Bloch wavefunctions in solids form a representation of crystalline symmetries. Recent studies revealed that symmetry representations in band structure can be used to diagnose the t…
On the general properties of non-linear optical conductivities
Haruki Watanabe, Yankang Liu, Masaki Oshikawa
The optical conductivity is the basic defining property of materials characterizing the current response toward time-dependent electric fields. In this work, following the approach…
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…