Search

Your search keyword '"Bao, W.-C."' showing total 4 results
Start Over Author "Bao, W.-C."
4 results on '"Bao, W.-C."'

1. Robust and clean Majorana zero mode in the vortex core of high-temperature superconductor (Li0.84Fe0.16)OHFeSe

Author

Liu, Q., Chen, C., Zhang, T., Peng, R., Yan, Y. J., Wen, C. H. P., Lou, X., Huang, Y. L., Tian, J. P., Dong, X. L., Wang, G. W., Bao, W. C., Wang, Q. H., Yin, Z. P., Zhao, Z. -X., and Feng, D. L.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons
Abstract

The Majorana fermion, which is its own anti-particle and obeys non-abelian statistics, plays a critical role in topological quantum computing. It can be realized as a bound state at zero energy, called a Majorana zero mode (MZM), in the vortex core of a topological superconductor, or at the ends of a nanowire when both superconductivity and strong spin orbital coupling are present. A MZM can be detected as a zero-bias conductance peak (ZBCP) in tunneling spectroscopy. However, in practice, clean and robust MZMs have not been realized in the vortices of a superconductor, due to contamination from impurity states or other closely-packed Caroli-de Gennes-Matricon (CdGM) states, which hampers further manipulations of Majorana fermions. Here using scanning tunneling spectroscopy, we show that a ZBCP well separated from the other discrete CdGM states exists ubiquitously in the cores of free vortices in the defect free regions of (Li0.84Fe0.16)OHFeSe, which has a superconducting transition temperature of 42 K. Moreover, a Dirac-cone-type surface state is observed by angle-resolved photoemission spectroscopy, and its topological nature is confirmed by band calculations. The observed ZBCP can be naturally attributed to a MZM arising from this chiral topological surface states of a bulk superconductor. (Li0.84Fe0.16)OHFeSe thus provides an ideal platform for studying MZMs and topological quantum computing., Comment: 32 pages, 15 figures (supplementary materials included), accepted by PRX

Published
2018
Full Text
View/download PDF

3. Synthesis of Ca1-xCexZrTi2-2xAl2xO7 zirconolite ceramics for plutonium disposition

Author

Zhong, M.-X., Walkley, B., Bailey, D.J., Blackburn, L.R., Ding, H., Wang, S.-Q., Bao, W.-C., Gardner, L.J., Sun, S.-K., Stennett, M.C., Corkhill, C.L., and Hyatt, N.C.

Abstract

A series of zirconolite ceramics with stoichiometry Ca1-xCexZrTi2-2xAl2xO7 (x = 0–0.35), considered as a host phase for the immobilisation of separated plutonium, were prepared from a mixture of oxide precursors by sintering in air at 1450 °C. Ce was utilised as a structural surrogate for Pu, with Al added to provide charge compensation. XRD and electron diffraction analyses indicated crystallisation of the zirconolite-2M polytype for all compositions, accompanied by various secondary phases contingent on the doping level, consistent with microstructure observation. The relative yield of zirconolite phases remained above 94 wt.% for 0.05 < x < 0.20. It was determined that Ce was partially reduced to the Ce3+ oxidation state and Al occupied mainly octahedral Ti sites. The incorporation rate of CeO2 was calculated to be 9.27 wt.% in Ca0.80Ce0.20ZrTi1.60Al0.40O7 with a comparatively high yield of 94.7 wt.%, which is representative of a PuO2 incorporation rate of 14.86 wt.%.

Published
2021

4. Synthesis of zirconolite-2M ceramics for immobilisation of neptunium

Author

Wei, Z-J, Bao, W.-C., Sun, S.-K., Blackburn, L.R., Tan, S.-H., Gardner, L.J., Guo, W.-M., Xu, F., Hyatt, N.C., and Lin, H.-T.

Abstract

Praseodymium-doped zirconolite ceramics targeting nominal composition Ca1-xPrxZrTi2-5x/3Al5x/3O7 (x ≤ 0.20, Δx = 0.05) were fabricated by a mixed oxide solid state reaction, at 1350 °C in air for 20 h. Praseodymium (Pr) was employed as a surrogate for neptunium (Np), with Al3+ co-accommodated to provide charge balance. High-resolution transmission electron microscopy and electron diffraction analyses confirmed that zirconolite crystallised as the 2 M monoclinic polytype throughout the phase evolution, with no evidence of transformation to other polytype structures. Phase assemblage and microstructural data were consistent with zirconolite occupying a high fraction of the phase assemblage (>ca. 93 wt %), alongside a minor secondary perovskite phase at all levels of targeted Pr incorporation. Despite this, it was demonstrated near theoretical density formed through a solid-state fabrication route, and we therefore propose that, through analogy with the corresponding Pr solid solution, zirconolite may be a suitable candidate for the immobilisation of Np-bearing wastes.

Published
2021

Catalog

Books, media, physical & digital resources
See catalog results