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Fractional Corner Charge of Sodium Chloride
Haruki Watanabe, Hoi Chun Po
Recent developments in higher-order topological phases have elucidated on the relationship between nontrivial multipole moments in the bulk and the emergence of fractionally quanti…
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…
Generalized -Sum Rules and Kohn formulas on Non-linear Conductivities
Haruki Watanabe, Masaki Oshikawa
The -sum rule and the Kohn formula are well-established general constraints on the electric conductivity in quantum many-body systems. We present their generalization to non-lin…