Tip-induced superconductivity coexisting with preserved topological properties in line-nodal semimetal ZrSiS

Aggarwal, Leena; Singh, Chandan Kumar; Aslam, M.; Singha, Ratnadwip; Gayen, Sirshendu; Kabir, Mukul; Mandal, P.; Sheet, Goutam

doi:10.1088/1361-648x/ab3b61

Cited by 21 publications

(17 citation statements)

References 38 publications

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“…Initial indications of correlation effects in ZrSiS were reported in Ref. [14] while tip-induced superconductivity was reported recently [15]. ZrSiS also shows a number of other striking properties including an optical conductivity that is independent of frequency over a large frequency range [16] and a butterfly-shaped angle-dependent magnetoresistance [17].…”

Section: Introductionmentioning

confidence: 91%

Determination of the Fermi surface and field-induced quasi-particle tunneling around the Dirac nodal-loop in ZrSiS

Müller,

Khouri,

van Delft

et al. 2020

Preprint

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Unambiguous and complete determination of the Fermi surface is a primary step in understanding the electronic properties of topical metals and semi-metals, but only in a relatively few cases has this goal been realized. In this work, we present a systematic high-field quantum oscillation study up to 35 T on ZrSiS, a textbook example of a nodal-line semimetal with only linearly dispersive bands crossing the Fermi energy. The topology of the Fermi surface is determined with unprecedented precision and all pockets are identified by comparing the measured angle dependence of the quantum oscillations to density functional theory calculations. Comparison of the Shubnikov-de Haas and de Haas-van Alphen oscillations at low temperatures and analysis of the respective Dingle plots reveal the presence of significantly enhanced scattering on the electron pocket. Above a threshold field that is aligned along the c-axis of the crystal, the specific cage-like Fermi surface of ZrSiS allows for electron-hole tunneling to occur across finite gaps in momentum space leading to quantum oscillations with a complex frequency spectrum. Additional high-frequency quantum oscillations signify magnetic breakdown orbits that encircle the entire Dirac nodal loop. We suggest that the persistence of quantum oscillations in the resistivity to high temperatures is caused by Stark interference between orbits of nearly equal masses.

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Section: Introductionmentioning

confidence: 91%

Determination of the Fermi surface and field-induced quasi-particle tunneling around the Dirac nodal-loop in ZrSiS

Müller,

Khouri,

van Delft

et al. 2020

Preprint

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“…目前已经证实的可以使用点接触针尖诱导超导的拓扑半金属材料还包括具有线节点的ZrSiS [127] 、Weyl 半金属TaP [115] 以及弱拓扑绝缘体TaAs 2 , NbAs 2 和 NbSb 2 [128] 等, 其中可以使用磁性针尖诱导超导的拓扑材料包括TaP [115] , TaAs [114,119] . 另外, 某些形态的Bi本身可能是超导体 [132] , 而点接触作为一种局部测量手段有可能探测到夹杂在Bi样品中的超导团簇的信号 [130] .…”

Section: -16unclassified

Applications of point-contact spectroscopy in the study of topological materials

Hou¹,

Chen²,

Hao³

et al. 2021

Sci. Sin.-Phys. Mech. Astron.

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“…In addition, the nearly perfectly nested Fermi surface may also enhance electron correlation effects. Fingerprints of correlation-driven or many-body effects include an enhanced effective mass under high magnetic fields [24], tip-induced superconductivity [25], and in the closely related compound ZrSiSe, photoinduced band renormalization [26]. Theoretical studies have also predicted an instability towards excitonic order [27].…”

Section: Introductionmentioning

confidence: 99%

Real-space visualization of quasiparticle dephasing near the Planckian limit in the Dirac line node material ZrSiS

He¹,

Zhou²,

Rost³

et al. 2021

Preprint

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Dirac line node (DLN) materials are topological semimetals wherein a set of symmetry protected crossing points forms a one-dimensional (1D) line in reciprocal space. Not only are the linearly dispersing bands expected to give rise to exceptional electronic properties, but the weak screening of the Coulomb interaction near the line node may enhance electronic correlations, produce new many-body ground states, or influence the quasiparticle lifetime. We investigate the quasiparticle dynamics in the DLN material ZrSiS via spectroscopic imaging scanning tunneling microscopy (SI-STM). By studying the spatial decay of quasiparticle interference patterns (QPI) from point scatterers, we were able to directly and selectively extract the phase coherence length l QPI and lifetime τ QPI for the bulk DLN excitations, which are dominated by inelastic electron-electron scattering. We find that the experimental τ QPI (E) values below −40 meV are very short, likely due to the stronger Coulomb interactions, and lie at the Planckian limit /|E|. Our results corroborate a growing body of experimental reports demonstrating unusual electronic correlation effects near a DLN.

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Tip-induced superconductivity coexisting with preserved topological properties in line-nodal semimetal ZrSiS

Cited by 21 publications

References 38 publications

Determination of the Fermi surface and field-induced quasi-particle tunneling around the Dirac nodal-loop in ZrSiS

Determination of the Fermi surface and field-induced quasi-particle tunneling around the Dirac nodal-loop in ZrSiS

Applications of point-contact spectroscopy in the study of topological materials

Real-space visualization of quasiparticle dephasing near the Planckian limit in the Dirac line node material ZrSiS

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