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Mercaldo, Maria Teresa; Kotetes, Panagiotis1,2; Cuoco, Mario3
Magnetoelectrically tunable Andreev bound state spectra and spin polarization in p-wave Josephson junctions
Source PublicationPHYSICAL REVIEW B
Language英语
KeywordNON-ABELIAN STATISTICS MAJORANA FERMIONS QUASI-PARTICLES SUPERCONDUCTIVITY
AbstractWe demonstrate how the boundary-driven reconstruction of the superconducting order parameter can be employed to manipulate the zero-energy Majorana bound states (MBSs) occurring in a topological Josephson junction. We focus on an interface of two p-wave superconductors, which are described by a spin-vector order parameter d. Apart from the sensitivity of d to external Zeeman/exchange fields, here, we show that the orientation of d throughout the junction can be controlled by electrically gating the weak link. The remarkable local character of this knob is a manifestation of the edge reconstruction of the order parameter, which takes place whenever different d-vector configurations in each superconductor compete and are close in energy. As a consequence, the spin-dependent superconducting-phase difference across the junction is switchable from 0 to pi. Moreover, in the regime where multiple edge MBSs occur for each superconductor, the Andreev bound state (ABS) spectra can be twisted by the application of either a charge- or spin-phase difference across the interface and give rise to a rich diversity of nonstandard ABS dispersions. Interestingly, some of these dispersions show band crossings protected by fermion parity, despite their 2 pi-periodic character. These crossings additionally unlock the possibility of nontrivial topology in synthetic spaces, when considering networks of such 1D junctions. Lastly, the interface MBSs induce a distinct electronic spin polarization near the junction, which possesses a characteristic spatial pattern that allows the detection of MBSs using spin-polarized scanning tunneling microscopy. These findings unveil novel paths to mechanisms for ABS engineering and single-out signatures relevant for the experimental detection and manipulation of MBSs.
2019
ISSN2469-9950
Volume100Issue:10Pages:104519
Cooperation Status国际
Subject AreaMaterials Science ; Physics
MOST Discipline CatalogueMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
DOI10.1103/PhysRevB.100.104519
Indexed BySCIE
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/27020
CollectionSCI期刊论文
Affiliation1.Univ Salerno, Dipartimento Fis ER Caianiello, IT-84084 Fisciano, SA, Italy
2.Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
4.CNR SPIN, IT-84084 Fisciano, SA, Italy
Recommended Citation
GB/T 7714
Mercaldo, Maria Teresa,Kotetes, Panagiotis,Cuoco, Mario. Magnetoelectrically tunable Andreev bound state spectra and spin polarization in p-wave Josephson junctions[J]. PHYSICAL REVIEW B,2019,100(10):104519.
APA Mercaldo, Maria Teresa,Kotetes, Panagiotis,&Cuoco, Mario.(2019).Magnetoelectrically tunable Andreev bound state spectra and spin polarization in p-wave Josephson junctions.PHYSICAL REVIEW B,100(10),104519.
MLA Mercaldo, Maria Teresa,et al."Magnetoelectrically tunable Andreev bound state spectra and spin polarization in p-wave Josephson junctions".PHYSICAL REVIEW B 100.10(2019):104519.
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