Bounds on nanoscale nematicity in single-layer<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>FeSe</mml:mi><mml:mo>/</mml:mo><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Huang, Dennis; Webb, Tatiana A.; Fang, Shiang; Song, Can-Li; Chang, Cui-Zu; Moodera, Jagadeesh S.; Kaxiras, Efthimios; Hoffman, Jennifer

doi:10.1103/physrevb.93.125129

Cited by 17 publications

(14 citation statements)

References 64 publications

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“…by the high Tc superconductivity reported in mono-layer FeSe films grown on SrTiO 3 9101114. Scanning tunneling microscopy experiments12 as well as ARPES measurements1113 on these FeSe mono-layers find that there are no hole pockets. Furthermore, the ARPES measurements of the variation of the gap magnitude around the electron pockets13 makes the possibility of d-wave pairing, arising from pair scattering between the electron pockets, unlikely.…”

mentioning

confidence: 91%

“…However, this picture relies on the nesting properties of the electronic band structure with both hole and electron Fermi surface pockets present and the absence of hole pockets in some of the iron based superconductors 5 6 7 8 9 10 11 has challenged these theories. In these systems, the hole like band drops below the Fermi energy after a Lifshitz transition 12 13 . Nevertheless, pairing remains strong, as evidenced e .…”

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confidence: 99%

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s± pairing near a Lifshitz transition

Mishra

Scalapino

Maier

2016

Sci Rep

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Observations of robust superconductivity in some of the iron based superconductors in the vicinity of a Lifshitz point where a spin density wave instability is suppressed as the hole band drops below the Fermi energy raise questions for spin-fluctuation theories. Here we discuss spin-fluctuation pairing for a bilayer Hubbard model, which goes through such a Lifshitz transition. We find s± pairing with a transition temperature that peaks beyond the Lifshitz point and a gap function that has essentially the same magnitude but opposite sign on the incipient hole band as it does on the electron band that has a Fermi surface.

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confidence: 91%

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confidence: 99%

s± pairing near a Lifshitz transition

Mishra

Scalapino

Maier

2016

Sci Rep

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“…A clear signature of the valley-spin coupling has been first demonstrated in 3R-type bulk MoS 2 22 . Quasiparticle interference (QPI) patterns observed by spectroscopic-imaging scanning tunneling microscopy (SI-STM) are also sensitive to the spin and orbital DOFs and have provided information on both spin and orbital structures in momentum space [23][24][25][26][27][28][29][30] . QPI patterns are generated by an interference between two quantum states on the same constant-energy contours in momentum space.…”

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confidence: 99%

Orbital-dependent quasiparticle scattering interference in 3R−NbS2

et al. 2017

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A valley degree of freedom (DOF) in transition metal dichalcogenides with broken inversion symmetry can be controlled through spin and orbital DOFs owing to their valley-contrasting characters. Another important aspect of the spin and orbital DOFs is that they affect quasiparticle scattering processes that govern the valley lifetime. Here we combine quasiparticle-interference (QPI) imaging experiments and theoretical simulations to study the roles of the spin and orbital DOFs in 3R-NbS2. We find that the QPI signal arising from an inter-valley scattering is noticeably weaker than that caused by an intra-valley scattering. We show that this behavior is predominantly associated with the orbital DOF, signifying the different spin and orbital structures of spin-split bands at each valley. These findings provide important insights into understanding the valley-related transport properties.

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“…It manifests as electronic anisotropy observed in experiments. [14][15][16][17][18][19][20] For most of the iron-based superconductors, superconductivity arises with the suppression of nematic phase via carrier doping. Nematicity is also suppressed at the boundaries of nematic domains (domain walls), where nematicity is broken due to the overlap of two orthogonal nematic domains.…”

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confidence: 99%

Edge States at Nematic Domain Walls in FeSe Films

Yuan

Liu

et al. 2018

Nano Lett.

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Quantum spin Hall (QSH) effect is an intriguing phenomenon arising from the helical edge states in two-dimensional topological insulators. We use molecular beam epitaxy (MBE) to prepare FeSe films with atomically sharp nematic domain boundaries, where tensile strains, nematicity suppression and topological band inversion are simultaneously achieved.Using scanning tunneling microscopy (STM), we observe edge states at the Fermi level that spatially distribute as two distinct strips in the vicinity of the domain boundaries. At the endpoint of the boundaries, a bound state at the Fermi level is further observed. The topological origin of the edge states is supported by density functional theory calculations.Our findings not only demonstrate a candidate for QSH states, but also provide a new pathway to realize topological superconductivity in a single-component film.

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Bounds on nanoscale nematicity in single-layerFeSe/SrTiO3

Cited by 17 publications

References 64 publications

s± pairing near a Lifshitz transition

s± pairing near a Lifshitz transition

Orbital-dependent quasiparticle scattering interference in 3R−NbS2

Edge States at Nematic Domain Walls in FeSe Films

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