Transit-Time Oscillations in Nanoscale Vacuum Diode with a Pure Resistive Load
Abstract
We examine the Ramo current in a nanoscale planar vacuum diode undergoing field emission in the presence of a DC voltage supply and an external resistor. We describe a simple mechanism for generating persistent current oscillations in the diode due to the voltage drop across the external resistor (beam loading), which reduces the total field and inhibits the emission. The amplitude and the frequency, which is in the THz domain, depend on the operating parameters of the diode. Molecular dynamics simulations are used to find the characteristics and physical basis of the mechanism, and a simple analytical model is presented, in good agreement with the simulation.
Fields of Study & Subjects
Carbon Nanotubes in Composites
Quantum and electron transport phenomena
Mechanical and Optical Resonators
Publication details
- Journal / source
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Volume
- 136
- Issue
- 7
- Pages
- 163–163
- Publication date
- 16 January 2026
- Language
- EN