2013/05/06 by Haibing Peng, Peng, Haibing
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Andreev reflection #Computer science #Condensed matter physics #Conductance #FOS: Physical sciences #Machine Learning in Materials Science #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics #Quantum mechanics #Reflection (computer programming) #Spectroscopy #Superconductivity (cond-mat.supr-con) #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1305.1086
7 pages, 1 figure
arxiv created 2013/05/06 · openalex publication_date 2013/05/06 · arxiv updated 2013/05/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In an experimental study of Andreev reflection (AR) in normal metal/superconductor (N-S) devices featuring a superconducting topological insulator CuxBi2Se3 [arXiv:1301.1030], Peng et. al. reported the reproducible experimental observation of archetypical double-peak AR spectra for finite barrier strength in N-S junctions, which clearly indicates the absence of zero-energy peak in density of states and thus rules out theoretically predicted zero-energy Majorana fermions in CuxBi2Se3. This report casts doubt on previous claims of CuxBi2Se3 as a topological superconductor. Here we clarify an inaccurate understanding which claims that no spectroscopic information can be extracted from N-S point-contacts showing conductance dips at finite bias. Such a clarification of the origin of conductance dips in AR spectra is important for future research in this field.