Observation and coherent control of interface-induced electronic resonances in a field-effect transistor
Abstract
Electronic defect states at material interfaces provide highly deleterious sources of noise in solid-state nanostructures, and even a single trapped charge can qualitatively alter the properties of short one-dimensional nanowire field-effect transistors (FET) and quantum bit (qubit) devices. Understanding the dynamics of trapped charge is thus essential for future nanotechnologies, but their direct detection and manipulation is rather challenging. Here, a transistor-based set-up is used to create and probe individual electronic defect states that can be coherently driven with microwave (MW) pulses. Strikingly, we resolve a large number of very high quality (Q ~ 1 × 105) resonances in the transistor current as a function of MW frequency and demonstrate both long decoherence times (~1 μs--40 μs) and coherent control of the defect-induced dynamics. Efficiently characterizing over 800 individually addressable resonances across two separate defect-hosting materials, we propose that their properties are consistent with weakly driven two-level systems.
- Publication:
-
Nature Materials
- Pub Date:
- February 2017
- DOI:
- 10.1038/nmat4754
- Bibcode:
- 2017NatMa..16..208T