Zip files: Paper Figures.zip: This zip file contains all datasets necessary for plotting the paper figures. MTX datasets are named the same as corresponding figures. DAT datasets (raw data) with a figure - filename map (Figure-rawdata map.xlsx). Jupyter notebooks for interactive graphing. Data Summaries.zip: Plotted extended data beyond paper figures, in ppt and measurement logs (laboratory notebooks) TEM.zip: TEM results. Full Original Raw Data.zip: Full Original Raw Data for each cooldown. See "Data Summaries.zip" for device information. See "Paper Figures.zip" for visualization. Data formats: MTX: A simple 2D/3D matrix format developed for Spyview (https://nsweb.tn.tudelft.nl/~gsteele/spyview/). DAT: Original spreadsheet data. SET: Instrument settings. PY: Measurement scripts.
We design and investigate an experimental system capable of entering an electron transport blockade regime in which a spin-triplet localized in the path of current is forbidden from entering a spin-singlet superconductor. To stabilize the triplet a double quantum dot is created electrostatically near a superconducting lead in an InAs nanowire. The dots are filled stochastically with electrons of either spin. The superconducting lead is a molecular beam epitaxy grown Al shell. The shell is etched away over a wire segment to make room for the double dot and the normal metal gold lead. The quantum dot closest to the normal lead exhibits Coulomb diamonds, the dot closest to the superconducting lead exhibits Andreev bound states and an induced gap. The experimental observations compare favorably to a theoretical model of Andreev blockade, named so because the triplet double dot configuration suppresses Andreev reflections. Observed leakage currents can be accounted for by finite temperature. We observe the predicted quadruple level degeneracy points of high current and a periodic conductance pattern controlled by the occupation of the normal dot. Even-odd transport asymmetry is lifted with increased temperature and magnetic field. This blockade phenomenon can be used to study spin structure of superconductors. It may also find utility in quantum computing devices that utilize Andreev or Majorana states.
Zip files: Paper Figures.zip: This zip file contains datasets and code necessary for generating paper figures. MTX datasets are in folders named after paper figures. DAT datasets are in "Original Raw Data.zip". "Main.ipynb" and "Supplementary.ipynb" are Jupyter notebooks generating main and supplementary figures. "Interactive Figure Examples.ipynb" shows examples of interactive graphing with the data. Data Summaries.zip: Plotted extended data beyond paper figures (in PPT) and measurement logs (in DOC). Simulation.zip: Simulation code and results. Full Original Raw Data.zip: Full Original Raw Data for all devices in "Data Summaries.zip". See "Data Summaries.zip" for device information. See "Paper Figures.zip" for data visualization code. Data formats: MTX: A simple 2D/3D matrix format developed for Spyview (https://nsweb.tn.tudelft.nl/~gsteele/spyview/). DAT: Original plain-text tabular data. SET: Instrument settings. PY: Measurement scripts.
The light-driven quantum vortex gyroscope constructed based on the quantized vortices of photoexcitation exciton-polaritons (E-Ps) Bose-Einstein Condensates (BECs) is a new all-optical device with great application potential. This paper carries out in-depth research on the stability of the semiconductor microcavity exciton-polaritons condensates vortices superposition system in the quantum vortex gyroscope. Simultaneously we constructed a time-independent model describing the stability of the system and a dynamic model describing the system's evolution. Based on this, we proceed from the eigen solution to analyze the different stable excitation pump threshold characteristics of the superposition state of the exciton-polaritons fluid in the ring trap with different orbital angular momentum (OAM) driven by the pump laser beam due to the nonlinear effect. Meanwhile, the differentiated dynamic evolution characteristics of exciton-polaritons wave function from eigenmode to high-order modes under different pump beam conditions are analyzed. Furthermore, several typical propagation modes are selected to analyze the influence of pump beam intensity perturbation on the system's stability. The self-consistent nature of the non-time-dependent stability judgment method and the time-dependent evolution dynamics process are verified in all the above studies. Finally, we obtained a series of conclusions that variable feedback occurs when the quantum vortex gyroscope exciton-polaritons condensates system with different potential well depths and different orbital angular momentum is impacted by the influence of the pump intensity noise. These conclusions are of great significance to the engineering realization of the quantum vortex gyroscope.
Kitaev chain is a theoretical model of a one-dimensional topological superconductor with Majorana zero modes at the two ends of the chain. With the goal of emulating this model, we build a chain of three quantum dots in a semiconductor nanowire. We observe Andreev bound states in each of the three dots and study their magnetic field and gate voltage dependence. Theory indicates that triple dot states acquire Majorana polarization when Andreev states in all three dots reach zero energy in a narrow range of magnetic field. In our device Andreev states in one of the dots reach zero energy at a lower field than in other two, placing the Majorana regime out of reach. Devices with greater uniformity or with independent control over superconductor-semiconductor coupling should can realize the Kitaev chain with high yield. Due to its overall tunability and design flexibility the quantum dot system remains promising for quantum simulation of interesting models and in particular for modular topological quantum devices.
For the exciton–polariton BEC system modulated by vortex light, we study its evolution based on the driven-dissipative Gross–Pitaevskii equation model. Via modified variational method, we first derive the two-dimensional system's evolution pattern from the initially coherent state prepared by vortex light modulation for non-rotating states and rotating states with various angular velocities. We identify close qualitatively matched patterns by comparing our theoretically derived evolution patterns with that from pure numerical simulation, demonstrating the applicability of our theoretical treatment presented. The derived exciton–polariton evolution pattern formulation can then be used to guide experimental observations of vortex manipulation effects for the exciton–polariton BEC system, with the possible identification of quantum gyroscopic effects.
Figure Data.zip: This zip file contains datasets and code necessary for generating paper figures. MTX and DAT datasets are in folders named after paper figures. "example.ipynb" is Jupyter notebook generating figures. Data Summary.zip: Plotted extended data beyond paper figures (in PPT). Simulation Code.zip: Simulation code, data, and results. Full Raw Data.zip: Full Original Raw Data for all devices. Data formats: MTX: A simple 2D/3D matrix format developed for Spyview (https://nsweb.tn.tudelft.nl/~gsteele/spyview/). DAT: Original plain-text tabular data. SET: Instrument settings. PY: Measurement scripts.
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