13 citations · 37 across the 7 of their papers we have counts for
7 papers
Nonperturbative effects in second harmonic generation
Keisuke Kitayama, Masao Ogata
Second-harmonic generation (SHG) is a quintessential probe of inversion symmetry breaking in condensed matter. While perturbative processes are well-documented, the nonpe…
Predicted DC current induced by propagating wave in gapless Dirac materials
Keisuke Kitayama, Masao Ogata
In this paper, we show that the application of propagating waves can induce a DC current even in systems with spatial inversion symmetry. We derive the equation for the DC current…
Nonlinear optical response in multiband Dirac-Electron System
Keisuke Kitayama, Masao Ogata
We study the dc photocurrent induced by linearly polarized light in a multiband Dirac-electron system, focusing on the organic conductor -(BEDT-TTF)I. Utilizing perturba…
Predicted novel type of photoinduced topological phase transition accompanied by collision and collapse of Dirac-cone pair in organic salt -(BEDT-TTF)I
Keisuke Kitayama, Masao Ogata, Masahito Mochizuki +1
Photoinduced topological phase transitions in the Dirac-electron systems have attracted intensive research interest since its theoretical prediction in graphene, where the applicat…
Predicted photoinduced pair annihilation of emergent magnetic charges in the organic salt -(BEDT-TTF)I irradiated by linearly polarized light
Keisuke Kitayama, Masahito Mochizuki, Yasuhiro Tanaka +1
Prolonged experimental attempts to find magnetic monopoles (i.e., elementary particles with an isolated magnetic charge in three dimensions) have not yet been successful despite in…
Floquet theory of photoinduced topological phase transitions in the organic salt -(BEDT-TTF)I irradiated with elliptically polarized light
Keisuke Kitayama, Yasuhiro Tanaka, Masao Ogata +1
We theoretically investigate possible photoinduced topological phase transitions in the organic salt -(BEDT-TTF)I, which possesses a pair of inclined massless Dirac-cone…
Predicted Photo-Induced Topological Phases in Organic Salt -(BEDT-TTF)I
Keisuke Kitayama, Masahito Mochizuki
The emergence of photo-induced topological phases and their phase transitions are theoretically predicted in organic salt -(BEDT-TTF)I, which possesses inclined Dirac co…