Ultrasensitive Photoresponse of Graphene Quantum Dot in the Coulomb Blockade Regime to THz Radiation
arXiv:2006.02926 · doi:10.1021/acs.nanolett.0c01800
Abstract
Graphene quantum dots (GQDs) have recently attracted considerable attention, with appealing properties for terahertz (THz) technology. This includes the demonstration of large thermal bolometric effects in GQDs when illuminated by THz radiation. However, the interaction of THz photons with GQDs in the Coulomb blockade regime - single electron transport regime - remains unexplored. Here, we demonstrate the ultrasensitive photoresponse to THz radiation (from <0.1 to 10 THz) of a hBN-encapsulated GQD in the Coulomb blockade regime at low temperature (170 mK). We show that THz radiation of 10 pW provides a photocurrent response in the nanoampere range, resulting from a renormalization of the chemical potential of the GQD of 0.15 meV. We attribute this photoresponse to an interfacial photogating effect. Furthermore, our analysis reveals the absence of thermal effects, opening new directions in the study of coherent quantum effects at THz frequencies in GQDs.
References in corpus (4)
Cited by in corpus (7)
- Room-Temperature Plasmon-Assisted Resonant THz Detection in Single-layer Graphene Transistors
- Quantum-dot single-electron transistor as thermoelectric quantum detectors at terahertz frequencies
- Tailored nano-electronics and photonics with two-dimensional materials at terahertz frequencies
- Engineering THz-frequency light generation, detection and manipulation through graphene
- Anomalous terahertz photoconductivity caused by the superballistic flow of hydrodynamic electrons in graphene
- Metallic Carbon Nanotube Quantum Dots with Broken Symmetries as a Platform for Tunable Terahertz Detection
- Radio-frequency charge detection on graphene electron-hole double quantum dots