Abstract
Using an ultralow 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.
Original language | English (US) |
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Article number | 143107 |
Journal | Applied Physics Letters |
Volume | 97 |
Issue number | 14 |
DOIs | |
State | Published - Oct 4 2010 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)