Experimental study of ac Josephson effect in gate-tunable (Bi1−xSbx)2Te3 thin-film Josephson junctions
Yuusuke Takeshige, Sadashige Matsuo, Russell S. Deacon, Kento Ueda, Yosuke Sato, Yi-Fan Zhao, Lingjie Zhou, Cui-Zu Chang, Koji Ishibashi, Seigo Tarucha
DOI 10.1103/PhysRevB.101.115410 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report on measurements of the ac Josephson effect in three-dimensional topological insulator (TI) Josephson junctions with Fermi energy tuning using a back gate. We successfully tune the Fermi energy into the bulk gap of the TI. We observe that the Josephson energy as a function of the gate voltage has a dip feature, indicating the presence of specular Andreev reflections. We study the ac Josephson effect with detection of both Shapiro steps and Josephson emission. The obtained results show no signature of Majorana modes. With the support of simulations, we conclude that the observation of the fractional ac Josephson effect may be complicated by both a large parallel capacitance and a small ratio of current carried in 4π period modes compared to conventional 2π modes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| MoRe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Evidence for coherent quantum phase slips across a Josephson junction array
similarity 0.95Vladimir E. Manucharyan et al.
Source status unknown — claims are unverified
Tunable Planar Josephson Junctions Driven by Time-Dependent Spin-Orbit Coupling
similarity 0.95David Monroe et al.
Source status unknown — claims are unverified
Analysis of Josephson junction barrier variation: A combined electron microscopy, breakdown, and Monte Carlo approach
similarity 0.94Oscar W. Kennedy et al.
Source status unknown — claims are unverified
Asymmetric Noise Probed with a Josephson Junction
similarity 0.94Q. Le Masne et al.
Source status unknown — claims are unverified
Thermal Activation above a Dissipation Barrier: Switching of a Small Josephson Junction
similarity 0.94D. Vion et al.
Source status unknown — claims are unverified
Emission and Absorption Asymmetry in the Quantum Noise of a Josephson Junction
similarity 0.94P.-M. Billangeon et al.
Source status unknown — claims are unverified