Related Experiment Video
Updated: Jan 20, 2026

Transport of Surface-modified Carbon Nanotubes through a Soil Column
Published on: April 2, 2015
THz photodetector using sideband-modulated transport through surface states of a 3D topological insulator
Puja Mondal1, Sankalpa Ghosh1, Manish Sharma2
1Department of Physics, Indian Institute of Technology Delhi, New Delhi-110016, India.
Abstract:
The transport properties of the surface charge carriers of a three dimensional topological insulator under a terahertz (THz) field along with a resonant double barrier structure is theoretically analyzed within the framework of Floquet theory to explore the possibility of using such a device for photodetection purposes. We show that due to the contribution of elastic and inelastic scattering processes in the resulting transmission, side-bands are formed in the conductance spectrum. This side band formation is similar to the side-bands formation in cavity transmission spectra in an optical cavity and this information can be used to detect the frequency of unknown THz radiation. The dependence of the conductance on the bias voltage, the effect of THz radiation on resonances and the influence of zero energy points on the transmission spectrum are also discussed.
Related Concept Videos
Insulation Coordination
Conductors and Insulators
Most metals are conductors. Their atomic configuration is such that one or more electron(s) are loosely bound to the nucleus in each atom. Thus, a sea of mobile electrons are available in them, known as free electrons. Their easy...
Thermal Insulation in Masonry Walls
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
Facilitated Transport
Regulated mRNA Transport
Primary Active Transport

