Topological superconductivity induced by a triple-
<b>q</b>
 magnetic structure

Bedow, Jasmin; Mascot, Eric; Posske, Thore; Uhrig, Götz S.; Wiesendanger, R.; Rachel, Stephan; Morr, Dirk K.

doi:10.1103/physrevb.102.180504

Cited by 30 publications

(15 citation statements)

References 26 publications

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“…In this way, deeper insight into the magnetic properties of AFM systems might be possible. Furthermore, DW control by atom positioning could, for instance, also facilitate the investigation of the interplay of complex spin textures with the superconducting Re substrate below T = 1.7 K 42 , 43 .…”

Section: Discussionmentioning

confidence: 99%

Discovery and characterization of a new type of domain wall in a row-wise antiferromagnet

et al. 2021

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Antiferromagnets have recently moved into the focus of application-related research, with the perspective to use them in future spintronics devices. At the same time the experimental determination of the detailed spin texture remains challenging. Here we use spin-polarized scanning tunneling microscopy to investigate the spin structure of antiferromagnetic domain walls. Comparison with spin dynamics simulations allows the identification of a new type of domain wall, which is a superposition state of the adjacent domains. We determine the relevant magnetic interactions and derive analytical formulas. Our experiments show a pathway to control the number of domain walls by boundary effects, and demonstrate the possibility to change the position of domain walls by interaction with movable adsorbed atoms. The knowledge about the exact spin structure of the domain walls is crucial for an understanding and theoretical modelling of their properties regarding, for instance, dynamics, response in transport experiments, and manipulation.

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Section: Discussionmentioning

confidence: 99%

Discovery and characterization of a new type of domain wall in a row-wise antiferromagnet

et al. 2021

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“…These constraints pose serious challenges in the detection and manipulation of the MBS under realistic conditions. Chiral magnetism in proximity to an s-wave superconductor generates exotic effects including the appearance of the Majorana modes [23][24][25][26][27][28] ; however, the location and stability of the Majorana states in these platforms are difficult to anticipate due to their non-localized nature.…”

Section: Introductionmentioning

confidence: 99%

Skyrmion Control of Majorana States in Planar Josephson Junctions

Mohanta

Okamoto

Dagotto

2021

Preprint

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Planar Josephson junctions provide a versatile platform, alternative to the nanowire-based geometry, for the generation of the Majorana bound states, due to the additional phase tunability of the topological superconductivity. The proximity induction of chiral magnetism and superconductivity in a two-dimensional electron gas showed remarkable promises to manipulate topological superconductivity. Here, we consider a Josephson junction involving a skyrmion crystal and show that the chiral magnetism of the skyrmions can create and control the Majorana bound states without the requirement of an intrinsic Rashba spin-orbit coupling. Interestingly, the Majorana bound states in our geometry are realized robustly at zero phase difference at the junction. The skyrmion radius, being externally tunable by a magnetic field or a magnetic anisotropy, brings a unique control feature for the Majorana bound states.

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“…The 3Q state, which has first been predicted as the ground state of a Mn monolayer on Cu(111) [4], is an intriguing non-collinear spin structure on a two-dimensional lattice which leads to topological orbital moments and a topological Hall effect even in the absence of spin-orbit coupling [17]. It has also been predicted to trigger topological superconductivity in a conventional superconductor [18]. Recently, the 3Q state has been discovered in a Mn monolayer on the Re(0001) surface by spin-polarized scanning tunneling microscopy (SP-STM) [6].…”

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confidence: 99%

“…In conclusion, we have demonstrated that the competition between higher-order exchange interactions and topological-chiral interactions needs to be taken into account in Mn monolayers. The novel types of magnetic ground states such as the 2Q or the distorted 3Q state will affect the transport properties of such systems [17] as well as their coupling to adjacent superconductors [18].…”

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confidence: 99%

Topological-chiral magnetic interactions in ultrathin films at surfaces

Haldar,

Meyer,

Kubetzka

et al. 2021

Preprint

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We demonstrate that topological-chiral magnetic interactions can play a key role for magnetic ground states in ultrathin films at surfaces. Based on density functional theory we show that significant chiral-chiral interactions occur in hexagonal Mn monolayers due to large topological orbital moments which interact with the emergent magnetic field. Due to the competition with higher-order exchange interactions superposition states of spin spirals such as the 2Q state or a distorted 3Q state arise. Simulations of spin-polarized scanning tunneling microscopy images suggest that the distorted 3Q state could be the magnetic ground state of a Mn monolayer on Re(0001).

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Topological superconductivity induced by a triple- q magnetic structure

Cited by 30 publications

References 26 publications

Discovery and characterization of a new type of domain wall in a row-wise antiferromagnet

Discovery and characterization of a new type of domain wall in a row-wise antiferromagnet

Skyrmion Control of Majorana States in Planar Josephson Junctions

Topological-chiral magnetic interactions in ultrathin films at surfaces

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