Low Temperature Electrostatic Force Microscopy of a Deep Two Dimensional Electron Gas using a Quartz Tuning Fork

Abstract

Using an ultra-low temperature, high magnetic field scanning probe microscope, we have measured electric potentials of a deeply buried two dimensional electron gas (2DEG). Relying on the capacitive coupling between the 2DEG and a resonant tip/cantilever structure, we can extract electrostatic potential information of the 2DEG from the dynamics of the oscillator. We present measurements using a quartz tuning fork oscillator and a 2DEG with a cleaved edge overgrowth structure. The sensitivity of the quartz tuning fork as force sensor is demonstrated by observation of Shubnikov de Haas oscillations at a large tip-2DEG separation distance of more than 500 nm.

References in corpus (4)

• Subsurface charge accumulation imaging of a quantum Hall liquid
• Fermi liquid to Luttinger liquid transition at the edge of a two-dimensional electron gas
• Direct observation of the charging of a 2D electron gas through an incompressible strip in the quantum Hall regime
• Scanned Potential Microscopy of Edge States in a Quantum Hall Liquid

Cited by in corpus (4)

• Design of a scanning gate microscope in a cryogen-free dilution refrigerator
• Evidence for local spots of viscous electron flow in graphene at moderate mobility
• A Transimpedance Amplifier for Remotely Located Quartz Tuning Forks
• Local imaging of high mobility two-dimensional electron systems with virtual scanning tunneling microscopy