تقرير
Multivalued current-phase relationship in a.c. Josephson effect for a three-dimensional Weyl semimetal WTe$_2$
| العنوان: | Multivalued current-phase relationship in a.c. Josephson effect for a three-dimensional Weyl semimetal WTe$_2$ |
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| المؤلفون: | Shvetsov, O. O., Kononov, A., Timonina, A. V., Kolesnikov, N. N., Deviatov, E. V. |
| المصدر: | EPL, 124, 47003 (2018) |
| سنة النشر: | 2018 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity |
| الوصف: | We experimentally study electron transport between two superconducting indium leads, coupled to a single WTe$_2$ crystal, which is a three-dimensional Weyl semimetal. We demonstrate Josephson current in long 5~$\mu$m In-WTe$_2$-In junctions, as confirmed by the observation of integer (1,2,3) and fractional (1/3, 1/2, 2/3) Shapiro steps under microwave irradiation. Demonstration of fractional a.c. Josephson effect indicates multivalued character of the current-phase relationship, which we connect with Weyl topological surface states contribution to Josephson current. In contrast to topological insulators and Dirac semimetals, we do not observe $4\pi$ periodicity in a.c. Josephson effect for WTe$_2$ at different frequencies and power, which might reflect chiral character of the Fermi arc surface states in Weyl semimetal. Comment: the text is seriously corrected. arXiv admin note: text overlap with arXiv:1801.09551 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1209/0295-5075/124/47003 |
| URL الوصول: | http://arxiv.org/abs/1809.03902 |
| رقم الأكسشن: | edsarx.1809.03902 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1209/0295-5075/124/47003 |
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