Two-dimensional electron systems subjected to a perpendicular magnetic field absorb electromagnetic radiation via cyclotron resonance (CR). Here we report qualitative deviation from this well-known behaviour in graphene. Our measurements of the terahertz photoresponse reveal resonant burst at main overtone CR that exceeds signal detected position ordinary CR. The dependencies on field, doping l...

Recently, pyroelectric materials have gained significant interest for energy harvesting, sensing and detection, so on. For photodetection, photodetectors show great advantages due to high-performance photo-sensing without an external bias voltage. In this review, the coefficients three types of important figure merits are introduced. Moreover, work mechanisms photodetectors, including light-ind...

Graphene-on-silicon photodetectors exhibit broadband detection capabilities with high responsivities, surpassing those of their counterpart semiconductors fabricated purely using graphene or Si. In these studies, channels were considered electrically neutral, and signal amplification was typically attributed to the photogating effect. By contrast, herein, we show p-type characteristics a struct...