Gate Tuning of Electronic Phase Transitions in Two-Dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>NbSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Xi, Xiaoxiang; Berger, H.; Forró, Lászlø; Shan, Jie; Mak, Kin Fai

doi:10.1103/physrevlett.117.106801

Cited by 193 publications

(148 citation statements)

References 48 publications

Supporting

Mentioning

141

Contrasting

Order By: Relevance

“…Here, we use the electron-phonon scattering model to analyze the λ of Li-intercalated SnSe 2 . In the high-temperature limit (T/Θ D ≫ 1, where Θ D is the Debye temperature), the resistivity can be expressed as [37,38]…”

Section: Resultsmentioning

confidence: 99%

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

Song

Liang

Guo

et al. 2019

Phys. Rev. Materials

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

Song

Liang

Guo

et al. 2019

Phys. Rev. Materials

View full text Add to dashboard Cite

show abstract

“…NbSe2 shows superconductivity in the two-dimensional (2D) limit [20][21][22][23] . Monolayer NbSe2 consists of one layer of Nb atoms sandwiched between two layers of Se atoms.…”

mentioning

confidence: 99%

Disorder-induced multifractal superconductivity in monolayer niobium dichalcogenides

et al. 2019

View full text Add to dashboard Cite

The interplay between disorder and superconductivity is a subtle and fascinating phenomenon in quantum many body physics. The conventional superconductors are insensitive to dilute nonmagnetic impurities, known as the Anderson's theorem 1 .Destruction of superconductivity and even superconductor-insulator transitions 2-10 occur in the regime of strong disorder. Hence disorder-enhanced superconductivity is rare and has only been observed in some alloys or granular states 11-17 . Because of the entanglement of various effects, the mechanism of enhancement is still under debate.Here we report well-controlled disorder effect in the recently discovered monolayer

show abstract

“…The inset depicts the experimentally obtained resistance of our MAG device as a function of carrier density n and base temperature T, exhibiting a variety of phases including metallic, correlated (CS) and superconducting (SC) states. Data for carrier densities is extracted from Refs(34)(35)(36)(37)(38)(39)(40)(41)(42)(43)(44).…”

mentioning

confidence: 99%

Magic-Angle Bilayer Graphene Nanocalorimeters: Toward Broadband, Energy-Resolving Single Photon Detection

Seifert

Stepanov

et al. 2020

Nano Lett.

View full text Add to dashboard Cite

Because of the ultra-low photon energies in the mid-infrared and terahertz frequencies, in these bands photodetectors are notoriously underdeveloped, and broadband single photon detectors (SPDs) are non-existent. Advanced SPDs exploit thermal effects in nanostructured superconductors, and their performance is currently limited to the more energetic near-infrared photons due to their high electronic heat capacity. Here, we demonstrate a superconducting magic-angle twisted bilayer graphene (MAG) device that is capable of detecting single photons of ultra-low energies by utilizing its record-low heat capacity and sharp superconducting transition. We theoretically quantify its calorimetric photoresponse and estimate its detection limits. This device allows the detection of ultrabroad range single photons from the visible to sub-THz with response time around 4 ns and energy resolution better than 1 THz. These attributes position MAG as an exceptional material for long-wavelength single photon sensing, which could revolutionize such disparate fields as quantum information processing and radio astronomy. Introduction:The detection of single photons is a key enabling technology in many research areas including quantum sensing, quantum key distribution, information processing and radio astronomy. Single photon detectors (SPDs) for wavelengths ranging from the visible to near infrared (nIR) have already been developed and even commercialized. State-of-the-art SPD technologies rely on heat-induced breaking of the superconducting state in nano-structured superconductors (SCs). Here, superconducting transition-edge sensors (TES) and superconducting nanowire single photon detectors (SNSPDs) have developed into the SPDs with the highest detection efficiencies, lowest dark count rates and operation wavelengths up to 10 µm (1-8). However, while no theoretical performance limits are evident so far, extending the broadband detection of single photons from the nIR to the far-infrared and the terahertz (THz), has yet to be demonstrated. TESs exploit the steepness of the temperature dependent resistance at the superconducting transition edge, which enables the generation of detectable voltages pulses upon heating electrons by absorbed light quanta (4, 5,9). Because the energy of an absorbed photon is transferred to the whole ensemble of electrons, the performance of TESs is determined by the heat capacity of the calorimetric materials used. This currently limits the SPD operation of TESs to wavelengths below 8µm(10), temperatures below 100mK, and detection times above ~10s(10-13).

show abstract

Gate Tuning of Electronic Phase Transitions in Two-DimensionalNbSe2

Cited by 193 publications

References 48 publications

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

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

Disorder-induced multifractal superconductivity in monolayer niobium dichalcogenides

Magic-Angle Bilayer Graphene Nanocalorimeters: Toward Broadband, Energy-Resolving Single Photon Detection

Contact Info

Product

Resources

About