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Bulk photovoltaic effects in altermagnets
Motohiko Ezawa
The bulk photovoltaic effect is a photocurrent generation from alternating electric field, which is a promising candidate for future efficient solar cell technology. It is the seco…
Realization of a one-dimensional topological insulator in ultrathin germanene nanoribbons
Dennis J. Klaassen, Lumen A. G. Eek, Alexander N. Rudenko +9
Realizing a one-dimensional (1D) topological insulator and identifying the lower dimensional limit of two-dimensional (2D) behavior are crucial steps toward developing high-density…
Third-order and fifth-order nonlinear spin-current generation in -wave and -wave altermagnets, and perfectly nonreciprocal spin-current in -wave magnets
Motohiko Ezawa
A prominent feature of -wave altermagnets is the pure spin current generated in the absence of spin-orbit interactions. In the context of symmetry, there are the -wave, the $…
Purely electrical detection of the spin-splitting vector in -wave magnets based on linear and nonlinear conductivities
Motohiko Ezawa
A -wave magnet has a momentum-dependent spin splitting and zero-net magnetization just as in the case of an altermagnet. It will be useful for high-density and ultra-fast memory…
Intrinsic nonlinear conductivity induced by quantum geometry in altermagnets and measurement of the in-plane Néel vector
Motohiko Ezawa
The -component of the Néel vector is measurable by the anomalous Hall conductivity in altermagnets because time reversal symmetry is broken. On the other hand, it is a nontrivia…
Analytic approach to quantum metric and optical conductivity in Dirac models with parabolic mass in arbitrary dimensions
Motohiko Ezawa
The imaginary part of the quantum geometric tensor is the Berry curvature, while the real part is the quantum metric. Dirac fermions derived from a tight-binding model naturally co…