Quasiparticle interference in doped topological insulators with nematic superconductivity

Khokhlov, D. A.; Akzyanov, R. S.

doi:10.1016/j.physe.2021.114800

Cited by 9 publications

(4 citation statements)

References 57 publications

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“…We demonstrate here that the nontrivial changes in Fermi surface topology in Bi2Se3 due to an increased SOC strength is tractable in terms of the quasiparticle interference (QPI) as a signal of the onset of a topological QPT in the carrier transport phase. For carriers that tunnel in Bi2Se3 at low bias, QPIs reproduce the twofold symmetry of the nematic order parameter [16]. QPIs are also observed here as single hexagons.…”

Section: Introductionsupporting

confidence: 68%

Unveiling the emergence of topological quantum phase transitions in the bidirectional transport of carriers through helical edge states in bismuth selenide

Ukpong,

Hussien,

de Souza

et al. 2023

Preprint

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Dynamically induced nontrivial band topology in the electronic structure of materials is increasingly being utilized as a primary resource for developing the quantum advantage in emerging technologies. This makes it a fundamental imperative in contemporary condensed matter physics to obtain a deep understanding of the emergence of topological phases during carrier transport in topological matter. In this paper, we have employed a combination of theoretical and computational methods to investigate the emergence of topological quantum transport phases in bismuth selenide and its bias-dependent characteristics by implementing a scalable numerical renormalization group strategy for the carrier transport state. We unravel the emergence of topological quantum phase transitions for carriers hosted on the (001) surface of bismuth selenide because of lattice sublattice asymmetry and spin-orbit coupling and show how the tunnelling transport through the helical surface state is protected against symmetry-breaking perturbations. Our key findings are as follows: (i) charge carriers in bismuth selenide flow bidirectionally through the helical edge states, (ii) the ballistic transport phase undergoes a topological to trivial dynamical phase transition when time reversal symmetry is broken due to an application of a phenomenological field, which may be realized experimentally by impurity doping with ferromagnetic species (iii) quasiparticle interference mediates a transition between different topological quantum phases. These insights are crucial in the rational design of materials for use as interconnects in miniaturized circuits, and manipulation protocols for realizing spontaneous carrier conduction channels using the topological edge states in devices for energy-efficient and lossless transport in microelectronic applications.

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Section: Introductionsupporting

confidence: 68%

Unveiling the emergence of topological quantum phase transitions in the bidirectional transport of carriers through helical edge states in bismuth selenide

Ukpong,

Hussien,

de Souza

et al. 2023

Preprint

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show abstract

“…The nematic superconductivity generated a great interest due to its unusual properties such as existence of Majorana Kramer's pairs [38,39], vestigial nematic order [40], surface Andreev bound states [41], unconventional collective modes [42], spontaneous strain [43], unusual magnetic response [44], and anisotropic quasiparticle interference [45,46]. A major of these effects are related to the vector nature of the order parameter.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Josephson Hall effect in doped topological insulators with the nematic superconductivity

Akzyanov¹,

Rakhmanov²

2022

Preprint

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We study the physics of the Josephson effect in nematic superconductors with Eu odd parity in the Ginzburg-Landau approach. Two-component vector superconducting order parameter makes this effect rather unusual. We get that the Meissner kernel has off-diagonal components. We derive current-phase relations for different configurations of the junction, crystallographic axes of the sample, and nematicity direction. We show that an anomalous Josephson Hall effect can be observed in such a system without any magnetization. That is, for definite orientations of the junction and crystal axes, a component of the Josephson current along the junction is induced by the order parameter phase difference across the contact. We also calculate the magnetic field dependence of the maximum current through the junction. We find that the period of the Fraunhofer oscillations of the maximum Josephson current depends on the geometry of the junction, direction of the magnetic field, and nematicity vector.

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“…Such symmetry breaking arises from the nematic superconducting order parameter within E u representation [8,9]. Unconventional nematic superconductivity gives rise to several intriguing phenomena such as surface Andreev bound states [10][11][12], half-quantum vortices [13,14], spin (nematic) vortices [15], spontaneous strain and magnetization [16], vestigial order [17], unconventional Higgs modes [18], anisotropic quasiparticle interference [19,20].…”

Section: Introductionmentioning

confidence: 99%

Lifshitz transition in dirty nematic superconductor

Akzyanov

2021

Preprint

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Quasiparticle interference in doped topological insulators with nematic superconductivity

Cited by 9 publications

References 57 publications

Unveiling the emergence of topological quantum phase transitions in the bidirectional transport of carriers through helical edge states in bismuth selenide

Unveiling the emergence of topological quantum phase transitions in the bidirectional transport of carriers through helical edge states in bismuth selenide

Anomalous Josephson Hall effect in doped topological insulators with the nematic superconductivity

Lifshitz transition in dirty nematic superconductor

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