Influence of a magnetic field on the current instability in a ballistic field-effect transistor
Bibliographic record
Abstract
A theoretical investigation is made of the plasma-wave instability mechanism in a two-dimensional (2D) electron fluid in a ballistic field-effect transistor (FET) in the presence of a perpendicular magnetic field. The 2D electron fluid in the FET channel has been treated within the framework of hydrodynamics applicable to the shallow water waves. We show that a relatively low dc current should be unstable because of magnetoplasma-wave amplification due to the reflection of the wave from the device boundaries. Just as in the absence of the magnetic field the instability occurs for $0<{\ensuremath{\upsilon}}_{0}<s$ and ${\ensuremath{\upsilon}}_{0}<\ensuremath{-}s,$ where ${\ensuremath{\upsilon}}_{0}$ is the local electron velocity and s the plasma-wave velocity. The external field B enhances this instability considerably as the imaginary part of the wave increases with B. Accordingly, the magnetic field can be used to compensate or overcome the stabilizing role of the external and/or internal friction on plasma-wave generation. Such a ballistic FET channel is a promising device for the generation of tunable electromagnetic radiation in the terahertz frequency range.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".