Super-Resonant Transport of Topological Surface States Subjected to In-Plane Magnetic Fields

Zhang, Song-Bo; Chang-an, LI; Peña-Benítez, Francisco; Surówka, Piotr; Moessner, Roderich; Molenkamp, Laurens W.; Trauzettel, Björn

doi:10.1103/physrevlett.127.076601

Cited by 9 publications

(9 citation statements)

References 72 publications

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“…We developed a phenomenological puddle network model. Using the formalism of ref , we show that lateral tunneling of charge carriers between the puddles in parallel magnetic fields results in prominent fluctuations of the conductance as a function of field amplitude, in good agreement with our experimental observations.…”

supporting

confidence: 87%

“…In this paper, we show how the concept of ref can be extended to satisfactorily describe experimentally observed in-plane magnetotransport fluctuations in HgTe-based devices. We have chosen HgTe-based structures for our transport experiments since they are nominally undoped and contain virtually no free carriers in the bulk of the material when the Fermi level is adjusted into the surface states, because of their screening properties .…”

mentioning

confidence: 95%

“…Building upon the idea of Dirac cone tilting, 8 Zhang et al 11 recently studied the lateral conductance between two regions of Dirac surface states, separated by a tunnel barrier, in the presence of an in-plane magnetic field including nonlinear terms in the dispersion. At specific magnetic fields, their model yields a super-resonant transport regime, in which many propagating modes can traverse the barrier potential without backscattering.…”

mentioning

confidence: 99%

“…The fundamental idea of our simulations is that each puddle by itself exhibits pronounced fluctuations in the magneto-conductance due to lateral super-resonant tunneling to its neighbors. 11 The network of puddles is then responsible for the full picture of magnetotransport. The two important parameters relevant for each puddle are the height of the potential barrier and the size of the puddle.…”

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confidence: 99%

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Fluctuations in Planar Magnetotransport Due to Tilted Dirac Cones in Topological Materials

et al. 2023

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Fluctuations in planar magnetotransport are ubiquitous in topological HgTe structures, in both tensile (topological insulator) and compressively strained layers (Weyl semimetal phase). We show that the common reason for the fluctuations is the presence of tilted Dirac cones combined with the formation of charge puddles. The origin of the tilted Dirac cones is the mix of the Zeeman term due to the in-plane magnetic field and quadratic contributions to the dispersion relation. We develop a network model that mimics the transport of tilted Dirac fermions in the landscape of charge puddles. The model captures the essential features of the experimental data. It should be relevant for the interpretation of planar magnetotransport in a variety of topological and small band gap materials.

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confidence: 87%

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confidence: 95%

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confidence: 99%

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confidence: 99%

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Fluctuations in Planar Magnetotransport Due to Tilted Dirac Cones in Topological Materials

et al. 2023

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“…Inspired by this, we propose a new method to generate the transverse valley current in the α − T 3 lattice by means of the crossed Andreev reflection * E-mail: shen@nju.edu.cn (CAR) [36][37][38][39][40]. We focus on the pure crossed Andreev reflection (pCAR) dominated transport [41][42][43][44] in the ferromagnet/superconductor/ferromagnet (FSF) junctions based on the gapped α − T 3 lattices, where the Fermi level is located between two spin-subband edges, as shown in Fig. 1(a).…”

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confidence: 99%

Pure crossed Andreev reflection assisted transverse valley currents in $α-\mathcal{T}_3$ lattices

Zeng,

Shen

2022

Preprint

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We propose a novel method for the generation of the transverse valley currents, which is based on the pure crossed Andreev reflection (pCAR) in the superconducting hybrid junctions composed of the gapped α − T3 lattices with ferromagnet-induced exchange interaction. The angle-resolved pCAR probability is asymmetric for a given valley, resulting in the transverse valley currents with zero net charge. This pCAR assisted chargevalley conversion is highly efficient with the valley Hall angle reaching an order of unity, suggesting potential applications for valleytronic devices.

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Magneto-optical properties in thin film topological insulators with quadratic momentum term

Rahim¹,

Akram²,

Sabeeh³

2021

J. Phys.: Condens. Matter

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In this work we investigate the influence of quadratic in momentum term (Schrodinger term) on magneto-transport properties of thin film topological insulators. The Schrodinger term modifies the Dirac cones into an hourglass shape which results in inter and intraband Landau levels crossings. Breaking of the particle-hole symmetry in Landau level spectrum in the presence of k2 term leads to asymmetrical density of states profile. We calculate collisional and Hall conductivity for mixed Dirac-Schrodinger system in linear response regime and show oscillatory behavior in collisional con- ductivity, while Zeeman and hybridization terms provide a doubly split peak structure in collisional conductivity for the case m/me → ∞. We calculate Hall conductivity analytically and show that for mixed system filling factor is not symmetric about Fermi energy unlike symmetic plateaus for pure Dirac case.

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Super-Resonant Transport of Topological Surface States Subjected to In-Plane Magnetic Fields

Cited by 9 publications

References 72 publications

Fluctuations in Planar Magnetotransport Due to Tilted Dirac Cones in Topological Materials

Fluctuations in Planar Magnetotransport Due to Tilted Dirac Cones in Topological Materials

Pure crossed Andreev reflection assisted transverse valley currents in $α-\mathcal{T}_3$ lattices

Magneto-optical properties in thin film topological insulators with quadratic momentum term

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