Enhancement of Shubnikov-de Haas oscillations by carrier modulation
Abstract
A drastic enhancement of the Shubnikov-de Haas (SdH) pattern is obtained by recording the changes in the quantum oscillations of magnetoresistance due to modulation of the carrier concentration. The technique enables measurement of the SdH waveform at relatively high temperatures and in samples with moderate mobilities. The modulated waveform shows selective enhancement of the low-frequency SdH oscillations associated with the upper subband. Thus, we were able to record very clear oscillations generated by a carrier concentration well below 5×1010 cm-2. The theory for this selective enhancement is provided.
- Publication:
-
Applied Physics Letters
- Pub Date:
- August 1992
- DOI:
- 10.1063/1.107859
- Bibcode:
- 1992ApPhL..61..551S
- Keywords:
-
- Carrier Density (Solid State);
- Hall Effect;
- High Electron Mobility Transistors;
- Magnetoresistivity;
- Modulation;
- Aluminum Gallium Arsenides;
- Indium Gallium Arsenides;
- Magnetic Fields;
- Waveforms;
- Solid-State Physics