Volume 118, Number 5, June 2017
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||09 August 2017|
Detecting fractional Josephson effect through 4π phase slip
1 Shandong Provincial Key Laboratory of Optical Communication, School of Physics Science and Information Engineering, Liaocheng University - Liaocheng 252059, PRC
2 Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, and School of Physics and Telecommunication Engineering, South China Normal University - Guangzhou 510006, PRC
3 National Laboratory of Solid State Microstructures, School of Physics, Nanjing University - Nanjing 210093, PRC
Received: 5 May 2017
Accepted: 11 July 2017
Fractional Josephson effect is a unique character of Majorana Fermions in topological superconductor system. This effect is very difficult to detect experimentally because of the disturbance of quasiparticle poisoning and unwanted couplings in the superconductor. Here, we propose a scheme to probe the fractional DC Josephson effect of a semiconductor nanowire-based topological Josephson junction through 4π phase slip. By exploiting a topological RF SQUID system we find that the dominant contribution for Josephson coupling comes from the interaction of Majorana Fermions, resulting in a resonant tunneling with 4π phase slip. Our calculations with experimentally reachable parameters show that the time scale for detecting the phase slip is two orders of magnitude shorter than the poisoning time of nonequilibrium quasiparticles. Additionally, with a reasonable nanowire length the 4π phase slip could overwhelm the topological trivial 2π phase slip. Our work is meaningful for exploring the effect of modest quantum fluctuations of the phase of the superconductor on the topological system, and provide a new method for quantum information processing.
PACS: 74.50.+r – Tunneling phenomena; Josephson effects / 74.20.Mn – Nonconventional mechanisms / 73.63.Nm – Quantum wires
© EPLA, 2017
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