Chin. Phys. Lett.  2016, Vol. 33 Issue (05): 057402    DOI: 10.1088/0256-307X/33/5/057402
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Fano Resonances Can Provide Two Criteria to Distinguish Majorana Bound States from Other Candidates in Experiments
Ye Xiong1,2**
1Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023
2National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
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Ye Xiong 2016 Chin. Phys. Lett. 33 057402
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Abstract There are still debates on whether the observed zero energy peak in the experiment by Stevan et al. [Science 346 (2014) 602] reveals the existence of the long pursued Majorana bound states (MBSs). We propose that, by mounting two scanning tunneling microscopic tips on top of the topological superconducting chain and measuring the transmission spectrum between these two metallic tips, there are two kinds of characteristics on the spectrum that are caused by MBSs uniquely. One is symmetric peaks with respect to zero energy and the other is $4\pi$ period caused by a nearby Josephson junction. The former refers to the fact that MBSs are composited by Majorana fermions which distributed in the particle and hole subspaces equally. The latter is based on the well known $4\pi$ period of Josephson effect in topological superconductor. We think that such two characteristics can be used as criteria to distinguish MBSs from other candidates, such as impurities, Kondo effect and traditional Andreev bound states.
Received: 30 December 2015      Published: 31 May 2016
PACS:  74.20.Rp (Pairing symmetries (other than s-wave))  
  74.55.+v (Tunneling phenomena: single particle tunneling and STM)  
  03.65.Vf (Phases: geometric; dynamic or topological)  
  71.10.Pm (Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.))  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/33/5/057402       OR      https://cpl.iphy.ac.cn/Y2016/V33/I05/057402
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