Magnetoelectrically tunable Andreev bound state spectra and spin polarization in p-wave Josephson junctions

doi:10.1103/PhysRevB.100.104519

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	Magnetoelectrically tunable Andreev bound state spectra and spin polarization in p-wave Josephson junctions
	Mercaldo, Maria Teresa ; Kotetes, Panagiotis 2,4; Cuoco, Mario 3
刊名	PHYSICAL REVIEW B
	2019
卷号	100 期号:10 页码:104519
关键词	NON-ABELIAN STATISTICS MAJORANA FERMIONS QUASI-PARTICLES SUPERCONDUCTIVITY
ISSN号	2469-9950
DOI	10.1103/PhysRevB.100.104519
英文摘要	We 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.
学科主题	Materials Science ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27020]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.CNR SPIN, 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.Univ Salerno, Dipartimento Fis ER Caianiello, IT-84084 Fisciano, SA, Italy
推荐引用方式 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.