Quantum ratchet broadband THz detector

We present world’s first ultra-wide spectral range quantum ratchet THz detector. It can detect the spectral range from 4 THz to 200 THz. The detector also shows evident photocurrent even at zero bias and presents a bias-tunable photoresponse characteristic. Additionally, the quantum ratchet detector exhibits pronounced rectification behavior at the temperature below 77 K owing to the ratchet effect, which makes it promising to improve the operation temperature.