[16p-Z05-1~9] Novel photonics using quantum materials and terahertz-infrared electric fields

▲ [16p-Z05-6] Investigation of luminescence from a localized plasmon induced by THz-field-driven tunneling electrons

〇(P)Kensuke Kimura¹, Yuta Morinaga², Hiroshi Imada¹, Ikufumi Katayama², Kanta Asakawa², Katsumasa Yoshioka², Yousoo Kim¹, Jun Takeda^1,2 (1.RIEKN SISL, 2.Yokohama Nat. Univ.)

Keywords:THz-STM, Scanning Tunneling Luminescence, localized plasmon

THz-STM spectroscopy is a recently emerged technique that can manipulate the motion of electrons with a picosecond timescale by utilizing the electric field of a THz single-cycle pulse and also track the carrier dynamics in various matters. However, although THz-STM is capable of conducting real-time investigations and manipulations of these dynamics, detection of energy dissipations accompanying quantum conversions has so far been impossible since the technique only measures the tunneling electrons. In this work, we combined a photon detection system with THz-STM for understanding and describing the energy dissipation of THz-field-driven electrons, since the photons emitted during the energy dissipations provide fruitful information of the energy dynamics. By utilizing this technique, we successfully detected the radiative decay of a localized plasmon excited by THz-field-driven electrons and clarified mechanistic differences in plasmon excitation between field- and DC-driven electrons.