Observation of interface superconductivity in a 
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/epitaxial graphene van der Waals heterostructure

Zhang, Yimin; Fan, Jia-Qi; Wang, Wenlin; Zhang, Ding; Wang, Lili; Li, Wei; He, Ke; Song, Can-Li; Ma, Xu-Cun; Xue, Quan

doi:10.1103/physrevb.98.220508

Cited by 37 publications

(49 citation statements)

References 38 publications

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“…Our electric-field gating can increase carrier concentration by one or two orders of magnitude. The SnSe 2 with high carrier density has been demonstrated to be superconductors with T c = 3.9 K[28] and 4.8 K [29]. However, we noticed that this gating method may not change the compound with large bandgap ( >2 eV) into metal, and the tuning ability is limited under the circumstances.…”

Section: Resultsmentioning

confidence: 96%

Superconductivity in Li-intercalated 1T−SnSe2 driven by electric field gating

Song

Liang

Guo

et al. 2019

Phys. Rev. Materials

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Creating carrier reservoirs in layered compounds can effectively tune the carrier density, which often induces a variety of emergent properties. Based on solid-ion-conductor gating technique, we successfully induce superconductivity of 4.8 K in ultrathin Li-intercalated SnSe2 samples. The Li + ions are driven in between interspacing of SnSe2 layers and form a single reservoir layer to provide electrons. In addition, a dome-like T c is found through substituting of S for Se, where the optimal T c is 6.2 K for SnSe1.8S0.2. Density functional theory calculations confirm that the intercalated LiSnSe2 is thermodynamically favorable, where the intercalation of Li expands the interlayer spacing by 10% and increases the carrier density by two orders of magnitude. Meanwhile the calculated results reveal that the enhanced electron-phonon interaction due to softened phonon determines the occurrence of superconductivity. Our results demonstrate that this strategy is very effective to explore superconductors in layered materials with narrow bandgap.

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Section: Resultsmentioning

confidence: 96%

Superconductivity in Li-intercalated 1T−SnSe2 driven by electric field gating

Song

Liang

Guo

et al. 2019

Phys. Rev. Materials

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“…On the other hand, charge transfer mechanism may also play an important role in the process [24]. When two materials come into contact, electrons will be transferred from one to the other until their Fermi levels are equal [25]. The work functions of graphene and Sb2Te3 are 4.5 eV [26] and 5.33 eV [27].…”

Section: Resultsmentioning

confidence: 99%

Moiré-pattern-modulated electronic structures in Sb2Te3/graphene heterostructure

et al. 2021

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Moiré superlattice has recently been found in topological insulators, which can lead to periodic modulation on the electronic structure. In this work, we report the low-temperature scanning tunneling microscopy study of Sb 2 Te 3 films grown on graphitized 4H-SiC. We find that substrate temperature can strongly influence the rotation angles between Sb 2 Te 3 film and graphene substrate. Three kinds of moiré patterns are observed at the first quintuple layer Sb 2 Te 3 film under different substrate temperatures. One shows complicated patterns with a rotation angle of nearly 0° relative to the substrate, another just exhibits simple 1 × 1 structure with a rotation angle of 30°. Other rotation angle like 8.2° is observed at higher substrate temperature as well, which is relatively rare. Comparison of the dI/dV curves from Sb 2 Te 3 films with different moiré patterns indicates that the superstructure can offer degrees of freedom in tailoring electronic structure. This work may stimulate the further study on the moiré modulation to the electronic properties of topological insulators.

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“…The modulationdoping induced two-dimensional hole liquid (2DHL) confined in the CuO 2 planes has come into being. In addition, the interface superconductivity in a structurally simple van der Waals heterostructure composed of semiconducting metal dichalcogenide SnSe 2 and graphene was realized very recently (Figure 1(g-i)) [26]. A two-dimensional electron gas (2DEG) marked with nonzero density of states (DOS) in the large semiconducting gap was found at the SnSe 2 /graphene interface, which bears the responsibility for superconductivity observed regardless of the semiconducting nature in bulk SnSe 2 .…”

Section: Introductionmentioning

confidence: 94%

“…Middle panels refer to scanning tunneling spectroscopy (STS). Lower panels show the band bending model [1,[24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Interface enhanced superconductivity in FeSe/SrTiO 3 and the hidden nature

Han¹,

Song²,

Ma³

et al. 2022

Comptes Rendus. Physique

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The superconductivity confined in a two-dimensional interface exhibits many exotic phenomena that have certain counterparts in layered cuprates and iron-based superconductors, and thus provides rare opportunities to reveal the mystery of high temperature superconductivity therein. By constructing and tailoring hybrid heterostructures such as FeSe/SrTiO 3 (FeSe/STO), interface-enhanced superconductivity arouses, and the substrate has been demonstrated to provide the phonons and enhance the strong electronphonon coupling (EPC) within monolayer FeSe. More research and reporting systems uncover that the bandbending induced charge transfer at the interface could become a unified microscopic picture to design the new interface superconductors. With re-examination of the experimental research in LaAlO 3 /STO (LAO/STO) and unconventional superconductors, the common characteristics such as band bending and rigid band shift are perceived in the FeSe/STO, LAO/STO and cuprate superconductors. This review may provide important information to inspect the mechanism of high-T c superconductivity from a different view.

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Observation of interface superconductivity in a SnSe2 /epitaxial graphene van der Waals heterostructure

Cited by 37 publications

References 38 publications

Superconductivity in Li-intercalated 1T−SnSe2 driven by electric field gating

Superconductivity in Li-intercalated 1T−SnSe2 driven by electric field gating

Moiré-pattern-modulated electronic structures in Sb2Te3/graphene heterostructure

Interface enhanced superconductivity in FeSe/SrTiO 3 and the hidden nature

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