講演情報
[15p-K301-2]Temperature Dependent Ultrafast Edge Photocurrent and Carrier Dynamics in WTe2 With On-chip THz Spectroscopy
〇(P)Subhashri Chatterjee1, Katsumasa Yoshioka1, Taro Wakamura1, Norio Kumada1 (1.NTT BRL, NTT Corp.)
キーワード：
2D materials、Ultrafast edge Photocurrent
We investigate temperature-dependent ultrafast edge photocurrent in Td-WTe2 using on-chip terahertz spectroscopy to elucidate the physics of carrier dynamics. By lowering the temperature, the time-domain signal appears from Cosine to Sine-like shape. Interestingly, it is highlighting distinct cooing pathways arising from the contributions of multiple carrier pockets, influenced by the temperature variations from 4K to 300K. This study reveals that photocurrent generation arises from a temperature gradient induced by the photothermoelectric effect. Our findings provide insights into energy relaxation, electron-phonon interactions, and their temperature dependence, paving the way for advanced applications in ultrafast photodetection, energy harvesting, and communications.