Non-adiabatic single-electron pump in a dopant-free GaAs/AlGaAs 2DEG
arXiv:2102.13320 · doi:10.1063/5.0062486
Abstract
We have realized quantized charge pumping using non-adiabatic single-electron pumps in dopant-free GaAs two-dimensional electron gases (2DEGs). The dopant-free III-V platform allows for ambipolar devices, such as p-i-n junctions, that could be combined with such pumps to form electrically-driven single photon sources. Our pumps operate at up to 0.95 GHz and achieve remarkable performance considering the relaxed experimental conditions: one-gate pumping in zero magnetic field and temperatures up to 5K, driven by a simple RF sine waveform. Fitting to a universal decay cascade model yields values for the figure of merit that compare favorably to reported modulation-doped GaAs pumps operating under similar conditions. The devices reported here are already suitable for optoelectronics applications, and with further improvement could offer a route to a current standard that does not require sub-Kelvin temperatures and high magnetic fields.
4 pages + references, 4 figures. Version 3: Updated Figure 2 with higher resolution data. Minor revisions in main text. Conclusions and arguments unchanged. Added Supplementary Material file. Version 2: Main results and analysis unchanged, minor revisions in presentation. Included new figure about fabrication details and expanded relevance of results to quantum optoelectronic applications
References in corpus (18)
- A solid-state entangled photon pair source with high brightness and indistinguishability
- Single-parameter non-adiabatic quantized charge pumping
- Roadmap on quantum nanotechnologies
- Partitioning of on-demand electron pairs
- Counting statistics for electron capture in a dynamic quantum dot
- An accurate single-electron pump based on a highly tunable silicon quantum dot
- Single-parameter quantized charge pumping in high magnetic fields
- Ballistic transport in induced one-dimensional hole systems
- Evidence for universality of tunable-barrier electron pumps
- Quantum fluctuations and coherence in high-precision single-electron capture
- Fabrication and characterisation of ambipolar devices on an undoped AlGaAs/GaAs heterostructure
- The Impact of Small-Angle Scattering on Ballistic Transport in Quantum Dots
- A quantized current source with mesoscopic feedback
- Quantised Charge Transport driven by a Surface Acoustic Wave in induced unipolar and bipolar junctions
- Single- and few-electron dynamic quantum dots in a perpendicular magnetic field
- Quantum dot state initialization by control of tunneling rates
- Improving reproducibility of quantum devices with completely undoped architectures
- Orientation of hole quantum Hall nematic phases in an out-of-plane electric field