Time-Resolved Optical Spectroscopy of Electrically Gated Single Quantum Emitters*

Quantum emitters such as nanocrystalline quantum dots or point defects in solid state materials have the potential to produce single photons on demand. We have developed a novel optical spectrometer capable of probing the transient response of single quantum emitters with dimensions ~10 nm or less over a wide range of frequencies in THz and NIR [1]. The experiments take advantage of strong nonlinearities in SrTiO3 and the ability to “write” conductive nanowires at the LaAlO3/SrTiO3 interface, with ~10 nm gaps co-located with a single quantum emitter. We will probe a variety of single quantum emitters individually under the influence of large electric fields and look for Stark shifts in absorption or emission in the quantum dots, and gate-controlled lifetime/emission effects.
[1] L. Chen, et al., Light: Science & Appl. 8, 24 (2019)
[2] E. Sheridan, Nano Letters (2020)
[3] M. Huang, et al., APL Materials 3, 062502 (2015)