Electron systems in low dimensions are enriched with many superior properties for both fundamental research and technical developments. Wide tunability of electron density, high mobility of motion, and feasible contro...Electron systems in low dimensions are enriched with many superior properties for both fundamental research and technical developments. Wide tunability of electron density, high mobility of motion, and feasible controllability in microscales are the most prominent advantages that researchers strive for. Nevertheless, it is always difficult to fulfill all in one solid-state system. Two-dimensional electron systems(2DESs) floating above the superfluid helium surfaces are thought to meet these three requirements simultaneously, ensured by the atomic smoothness of surfaces and the electric neutrality of helium. Here we report our recent work in preparing, characterizing, and manipulating 2DESs on superfluid helium. We realized a tunability of electron density over one order of magnitude and tuned their transport properties by varying electron distribution and measurement frequency. The work we engage in is crucial for advancing research in many-body physics and for development of single-electron quantum devices rooted in these electron systems.展开更多
Two-dimensional electron system(2DES)has been widely recognized as critical for fundamental physical research and holds significant potential for developing information devices.A 2DES floating on the surface of liquid...Two-dimensional electron system(2DES)has been widely recognized as critical for fundamental physical research and holds significant potential for developing information devices.A 2DES floating on the surface of liquid helium exhibits exceptionally high mobility,tunability,and controllability,making it an ideal candidate for quantum device applications.Reliable electron transfer that preserves electrons'quantum state is an essential requirement for device fabrication.In this study,we investigate electron transfer for 2DES floating on helium triggered by surface acoustic waves(SAW).By coupling electrons with the evanescent electric field of SAW,we successfully observed acoustoelectric currents.Dynamics of electron transfer were captured in real-time via time-of-flight experiments,allowing us to determine their transfer speed,magnitude,and resistance.By tuning the power of SAW pulses,we achieved a transfer rate from 8.87×10^(3) to 4.63×10^(5) electrons per pulse,accounting for a fraction between 9.48×10^(-6)and 4.95×10^(-4)of the entire 2DES.Our study provides a promising approach for fabricating quantum devices based on 2DES floating on helium.展开更多
基金supported by the Beijing Natural Science Foundation (Grant No. JQ21002)the National Natural Science Foundation of China (Grant No. T2325026)+2 种基金the National Key R&D Program of China(Grant No. 2021YFA1401902)the Key Research Program of Frontier Sciences,CAS (Grant No. ZDBS-LY-SLH0010)the CAS Project for Young Scientists in Basic Research (Grant No. YSBR-047)。
文摘Electron systems in low dimensions are enriched with many superior properties for both fundamental research and technical developments. Wide tunability of electron density, high mobility of motion, and feasible controllability in microscales are the most prominent advantages that researchers strive for. Nevertheless, it is always difficult to fulfill all in one solid-state system. Two-dimensional electron systems(2DESs) floating above the superfluid helium surfaces are thought to meet these three requirements simultaneously, ensured by the atomic smoothness of surfaces and the electric neutrality of helium. Here we report our recent work in preparing, characterizing, and manipulating 2DESs on superfluid helium. We realized a tunability of electron density over one order of magnitude and tuned their transport properties by varying electron distribution and measurement frequency. The work we engage in is crucial for advancing research in many-body physics and for development of single-electron quantum devices rooted in these electron systems.
基金supported by the Beijing Natural Science Foundation(Grant No.JQ21002)the National Natural Science Foundation of China(Grant No.T2325026)+2 种基金the National Key R&D Program of China(Grant No.2021YFA1401902)the Key Research Program of Frontier Sciences,CAS(Grant No.ZDBS-LY-SLH0010)the CAS Project for Young Scientists in Basic Research(Grant No.YSBR047)。
文摘Two-dimensional electron system(2DES)has been widely recognized as critical for fundamental physical research and holds significant potential for developing information devices.A 2DES floating on the surface of liquid helium exhibits exceptionally high mobility,tunability,and controllability,making it an ideal candidate for quantum device applications.Reliable electron transfer that preserves electrons'quantum state is an essential requirement for device fabrication.In this study,we investigate electron transfer for 2DES floating on helium triggered by surface acoustic waves(SAW).By coupling electrons with the evanescent electric field of SAW,we successfully observed acoustoelectric currents.Dynamics of electron transfer were captured in real-time via time-of-flight experiments,allowing us to determine their transfer speed,magnitude,and resistance.By tuning the power of SAW pulses,we achieved a transfer rate from 8.87×10^(3) to 4.63×10^(5) electrons per pulse,accounting for a fraction between 9.48×10^(-6)and 4.95×10^(-4)of the entire 2DES.Our study provides a promising approach for fabricating quantum devices based on 2DES floating on helium.
