Interaction effects in a microscopic quantum wire model with strong spin–orbit interaction

Winkler, Georg; Ganahl, Martin; Schuricht, Dirk; Evertz, Hans Gerd; Andergassen, Sabine

doi:10.1088/1367-2630/aa7027

Cited by 7 publications

(6 citation statements)

References 90 publications

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“…For example, new quasiparticles appear due to the parity breaking of the spiral state (left and right movers). Similar physics can be found in systems with spin-orbit coupling (68,69). Here, again, this is an effect of competing energy scales.…”

Section: Discussionsupporting

confidence: 71%

Block–spiral magnetism: An exotic type of frustrated order

Herbrych

Heverhagen

Álvarez

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Competing interactions in quantum materials induce exotic states of matter such as frustrated magnets, an extensive field of research from both the theoretical and experimental perspectives. Here, we show that competing energy scales present in the low-dimensional orbital-selective Mott phase (OSMP) induce an exotic magnetic order, never reported before. Earlier neutron-scattering experiments on iron-based 123 ladder materials, where OSMP is relevant, already confirmed our previous theoretical prediction of block magnetism (magnetic order of the form↑↑↓↓). Now we argue that another phase can be stabilized in multiorbital Hubbard models, the block–spiral state. In this state, the magnetic islands form a spiral propagating through the chain but with the blocks maintaining their identity, namely rigidly rotating. The block–spiral state is stabilized without any apparent frustration, the common avenue to generate spiral arrangements in multiferroics. By examining the behavior of the electronic degrees of freedom, parity-breaking quasiparticles are revealed. Finally, a simple phenomenological model that accurately captures the macroscopic spin spiral arrangement is also introduced, and fingerprints for the neutron-scattering experimental detection are provided.

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Section: Discussionsupporting

confidence: 71%

Block–spiral magnetism: An exotic type of frustrated order

Herbrych

Heverhagen

Álvarez

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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show abstract

“…For example, new quasiparticles appear due to the parity breaking of the spiral state ("left" and "right" movers). Similar physics can be found in systems with spin-orbit coupling [48,49]. Here, again, this is an effect of competing energy scales.…”

Section: Discussionsupporting

confidence: 71%

Block-spiral magnetism: An exotic type of frustrated order

Herbrych,

Heverhagen,

Alvarez

et al. 2019

Preprint

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Competing interactions in Quantum Materials induce novel states of matter such as frustrated magnets, an extensive field of research both from the theoretical and experimental perspectives.Here, we show that competing energy scales present in the low-dimensional orbital-selective Mott phase (OSMP) induce an exotic magnetic order, never reported before. Earlier neutron scattering experiments on iron-based 123 ladder materials, where OSMP is relevant, already confirmed our previous theoretical prediction of block-magnetism (magnetic order of the form ↑↑↓↓). Now we argue that another novel phase can be stabilized in multiorbital Hubbard models, the "block-spiral state". In this state, the magnetic islands form a spiral propagating through the chain but with the blocks maintaining their identity, namely rigidly rotating. This new spiral state is stabilized without any apparent frustration, the common avenue to generate spiral arrangements in multiferroics. By examining the behaviour of the electronic degrees of freedom, parity breaking quasiparticles are revealed. Finally, a simple phenomenological model that accurately captures the macroscopic spin spiral arrangement is also introduced.

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“…As the TD1RDM gives us full information on the local charge and current densities within the nanowire, we calculate the total current through the nanowire by considering a bond current between two atomic sites. In addition, the traditional bond-current operator has to be adapted to include the contribution from the spinorbit coupling and from the SC pair potential [62][63][64]. In appendix E we derive the following expression for the bond current between the sites j and j+1 within the nanowire:…”

Section: Model and Methodsmentioning

confidence: 99%

Distinguishing Majorana zero modes from impurity states through time-resolved transport

et al. 2019

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We study time-resolved charge transport in a superconducting nanowire using time-dependent Landauer-Büttiker theory. We find that the steady-state Majorana zero-bias conductance peak emerges transiently accompanied by characteristic oscillations after a bias-voltage quench. These oscillations are suppressed for trivial impurity states (IS) that otherwise show a similar steady-state signal as the Majorana zero mode (MZM). In addition, we find that Andreev bound states or quasi-Majorana states (QMS) in the topologically trivial bulk phase can give rise to a zero-bias conductance peak, also retaining the transient properties of the MZM. Our results imply that (1) time-resolved transport may be used as a probe to distinguish between the topological MZM and trivial IS; and (2) the QMS mimic the transient signatures of the topological MZMs.

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Interaction effects in a microscopic quantum wire model with strong spin–orbit interaction

Cited by 7 publications

References 90 publications

Block–spiral magnetism: An exotic type of frustrated order

Block–spiral magnetism: An exotic type of frustrated order

Block-spiral magnetism: An exotic type of frustrated order

Distinguishing Majorana zero modes from impurity states through time-resolved transport

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