Influence of exchange interaction on spin-dependent transport through a single quantum dot doped with a magnetic ion
Bibliographic record
Abstract
A quantum theory of single-electron tunneling through a quantum dot (QD), doped with a ${\mathrm{Mn}}^{2+}$ ion and weakly coupled to ferromagnetic (FM) leads in the Coulomb blockade regime, is developed using the sequential tunneling approach and assuming that spin flips do not occur. It predicts a spin-injection-induced magnetization and a spin-dependent current. The spin polarization of the current and the tunneling magnetoresistance (TMR) can be well controlled by a bias voltage and strongly enhanced by the electron-Mn exchange interaction and the spin selectivity of the leads. An appropriate choice of these parameters yields a highly polarized current even when the FM source is not 100% polarized. Analytical expressions for the magnetization, spin-dependent current, spin polarization, and the TMR are derived for zero magnetic field. When the QD is subjected to a strong magnetic field, the numerical calculations predict an oscillatory behavior of the TMR as a function of the bias voltage.
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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".