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4 results for “correlated insulator”
Correlation Between Insulation Resistance and Temperature Measurement Error in Type K and Type N Mineral Insulated, Metal Sheathed Thermocouples
<p>Mineral insulated, metal sheathed (MI) Type K and Type N thermocouples are<br> widely used in industry for process monitoring and control. One factor that limits<br> their accuracy is the dramatic decrease in the insulation resistance at temperatures<br> above about 600 °C which results in temperature measurement errors due to electrical<br> shunting. In this work the insulation resistance of a cohort of representative MI<br> thermocouples was characterised at temperatures up to 1160 °C, with simultaneous<br> measurements of the error in indicated temperature by in situ comparison with a reference<br> Type R thermocouple. Intriguingly, there appears to be a systematic relationship<br> between the insulation resistance and the error in the indicated temperature. At<br> a given temperature, as the insulation resistance decreases, there is a corresponding<br> increasingly negative error in the temperature measurement. Although the measurements<br> have a relatively large uncertainty (up to about 1 °C in temperature error and<br> up to about 10 % in insulation resistance measurement), the trend is apparent at all<br> temperatures above 600 °C, which suggests that it is real. Furthermore, the correlation<br> disappears at temperatures below about 600 °C, which is consistent with the<br> well-established diminution of insulation resistance breakdown effects below that<br> temperature. This raises the intriguing possibility of using the as-new MI thermocouple<br> calibration as an indicator of insulation resistance breakdown: large deviations<br> of the electromotive force (emf) in the negative direction could indicate a correspondingly<br> low insulation resistance.</p>
Unconventional correlated insulator in CrOCl-interfaced Bernal bilayer graphene
<p> Gap opening in a wide-enough doping range, whilst keeping high conductance outside this gapped state, has remained a grand challenge in graphene since decades. Here, we show a unique heterostructure of Bernal-stacked bilayer graphene (BLG) atop few-layered CrOCl, which enables a surface state in CrOCl under vertical electric fields, and it promotes electron-electron(e-e) interactions in BLG via Coulomb long ranged coupling. Consequently, at the charge neutral, a crossover from single particle insulating behavior to an unconventional correlated insulator is seen, below a critical temperature. The over1 GΩ insulating ground state exists in a widely accessible gate range, and can be switched into a metallic state with an on/off ratio up to 10<sup>7</sup>, by applying an in-plane electric field, heating, or by gating. A logic inverter using such correlated insulator is demonstrated, despite that it works still at low temperature. Our findings of the correlated insulating phase in CrOCl/BLG heterosystem paves the way for future engineering of exotic quantum electronic states in the paradigm of interfacial charge coupling.</p>
Data from: Engineering correlated insulators in bilayer graphene with a remote Coulomb superlattice
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Induced superconducting correlations in a quantum anomalous Hall insulator
<p>This folder contains the raw data files and KWANT simulation code used in the generation of the main and supplementary figures of our publication in <a href="https://www.nature.com/articles/s41567-024-02574-1">Nature Physics</a> 20, 1589–1595 (2024): "Induced superconducting correlations in a quantum anomalous Hall insulator", written by A. Uday, G. Lippertz, K. Moors, H. F. Legg, R. Joris, A. Bliesener, L. M. C. Pereira, A. A. Taskin, and Y. Ando.</p> <p>The measurement data for each figure can be found in csv format in the corresponding folder. The labels and units are specified in the file headers, except for the 2D-plots in Fig4c and FigS8c. The 2D-plots are a square grid of size 400nm x 400nm (i.e. 400nm/460 points); a separate csv file is added for the conversion from points to a nm-scale. The amplitude of j(x,y) provided in the csv files are in arbitrary units for Fig4c and FigS8c and are not normalised yet.</p> <p>The main and supplementary figures of the manuscript are added as well in pdf format in the corresponding folders.</p> <p>The KWANT code used for the simulations presented in the manuscript is all contained in the Jupyter notebook 'CAR.ipynb'.</p>
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