Anisotropic dielectric response of tilted Dirac cone investigated by polarized infrared light using synchrotron radiation

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We have succeeded to measure the polarized infrared optical reflectance spectra of the organic conductor α-(BEDT-TTF)_2I_3 under high pressures, which possesses Dirac electronic state. Pressure variation of the characteristic optical spectra with less energy dispersion in the Dirac state was observed. In this study, we developed the experimental method of the polarized microscope optical reflectance measurements using the synchrotron radiation light for the small organic materials in the Diamond Anvil cell (DAC).