Charge carrier transport asymmetry in monolayer graphene
| Autor: | Issai Shlimak, Amos Sharoni, E. Zion, Andrey Butenko, Moshe Kaveh |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics media_common.quotation_subject Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology Electron Conductivity Quantum Hall effect 021001 nanoscience & nanotechnology 01 natural sciences Asymmetry Magnetic field Hysteresis Hall effect Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Charge carrier 010306 general physics 0210 nano-technology media_common |
| Zdroj: | Physical Review B. 96 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.96.245143 |
| Popis: | The conductivity and Hall effect were measured in CVD-grown monolayer graphene as a function of the gate voltage, $V_{g}$, at temperatures down to $T$ = 2 K and in magnetic fields up to $B$ = 8 T. The minimal conductivity was observed at positive $V_{g}$ which shows the position of the charge neutrality point, $V_{NP}$. With decreasing $T$, $V_{NP}$ first decreases, but stop to decrease at low $T$. Hysteresis of conductivity shows similar behavior: it decreases with decreasing $T$ and disappears at low $T$. A significant asymmetry was observed at low density of charge carriers $|n|=(n,p)$: mobility of holes was less than mobility of electrons. The asymmetry decreases with increasing $|n|$. It was observed that the value of $|n|$ determined from the Hall effect is less than the full value induced by $V_{g}$. In strong perpendicular $B$, Shubnikov-de Haas (SdH) oscillations were observed in the longitudinal conductivity, $\sigma_{xx}$, together with half-integer quantum Hall plateaus. It was found that $|n|$ determined from SdH oscillations is equal to the full value induced by $V_{g}$ as opposed to the Hall effect. Explanatory models for all observed phenomena are discussed. Comment: 8 pages, 6 figures |
| Databáze: | OpenAIRE |
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