Disorder-induced multifractal superconductivity in monolayer niobium dichalcogenides

Zhao, Kun; Lin, Hsiu-Li; Xiao, Xiao; Huang, Wantong; Yao, Wei; Yan, Mingzhe; Xing, Ying; Zhang, Qinghua; Li, Zixiang; Hoshino, Shintaro; Wang, Jian; Zhou, Shuyun; Gu, Lin; Bahramy, M. S.; Yao, Hong; Nagaosa, Naoto; Xue, Qi‐Kun; Law, K. T.; Chen, Xi; Ji, Shuai‐Hua

doi:10.1038/s41567-019-0570-0

Cited by 117 publications

(116 citation statements)

References 60 publications

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“…Recent theory has revealed that nonreciprocal charge transport occurs in non-centrosymmetric superconductors when vortices driven by the external charge current move among the asymmetric pinning potentials in the vortex flow regime 15 . In 2D NbSe 2 , the asymmetric pinning potentials naturally appear as a consequence of disorder 15 such as defects [30][31][32] in 2D crystals with inversion symmetry breaking, as shown in Fig. 1c.…”

Section: Max1mentioning

confidence: 97%

Nonreciprocal superconducting NbSe2 antenna

Zhang

Zou

et al. 2020

Nat Commun

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The rise of two-dimensional (2D) crystalline superconductors has opened a new frontier of investigating unconventional quantum phenomena in low dimensions. However, despite the enormous advances achieved towards understanding the underlying physics, practical device applications like sensors and detectors using 2D superconductors are still lacking. Here, we demonstrate nonreciprocal antenna devices based on atomically thin NbSe2. Reversible nonreciprocal charge transport is unveiled in 2D NbSe2 through multi-reversal antisymmetric second harmonic magnetoresistance isotherms. Based on this nonreciprocity, our NbSe2 antenna devices exhibit a reversible nonreciprocal sensitivity to externally alternating current (AC) electromagnetic waves, which is attributed to the vortex flow in asymmetric pinning potentials driven by the AC driving force. More importantly, a successful control of the nonreciprocal sensitivity of the antenna devices has been achieved by applying electromagnetic waves with different frequencies and amplitudes. The device’s response increases with increasing electromagnetic wave amplitude and exhibits prominent broadband sensing from 5 to 900 MHz.

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Section: Max1mentioning

confidence: 97%

Nonreciprocal superconducting NbSe2 antenna

Zhang

Zou

et al. 2020

Nat Commun

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Section: Bcs Superconductorsmentioning

confidence: 99%

“…Therefore, the enhancement by both dopants could be understood by the formation of multifractal electron wavefunction. [ 94 ] Due to the limited resolution, direct observation of the multifractality remains to be a big challenge.…”

Section: Bcs Superconductorsmentioning

confidence: 99%

Recent Advances in 2D Superconductors

et al. 2021

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The emergence of superconductivity in 2D materials has attracted much attention and there has been rapid development in recent years because of their fruitful physical properties, such as high transition temperature (Tc), continuous phase transition, and enhanced parallel critical magnetic field (Bc). Tremendous efforts have been devoted to exploring different physical parameters to figure out the mechanisms behind the unexpected superconductivity phenomena, including adjusting the thickness of samples, fabricating various heterostructures, tuning the carrier density by electric field and chemical doping, and so on. Here, different types of 2D superconductivity with their unique characteristics are introduced, including the conventional Bardeen–Cooper–Schrieffer superconductivity in ultrathin films, high‐Tc superconductivity in Fe‐based and Cu‐based 2D superconductors, unconventional superconductivity in newly discovered twist‐angle bilayer graphene, superconductivity with enhanced Bc, and topological superconductivity. A perspective toward this field is then proposed based on academic knowledge from the recently reported literature. The aim is to provide researchers with a clear and comprehensive understanding about the newly developed 2D superconductivity and promote the development of this field much further.

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“…However we do not think this latter case is relevant to the standard s-wave superconductor studied here. Also very recently, it was found that, while the effect of disorder on the dichalcogenide NbSe 2 in bulk form is explained in terms of CDW-superconductivity competition and synergy [41], in monolayer NbSe 2 a much larger T c dome was discovered as a function of disorder and this has been proposed to be due to the wave-function multifractality in a 2D monolayer system [73,74]. Thus, disorder as a tuning parameter is finding relevance not only for the study of bulk superconductors with density waves but also for 2D materials such as monolayer transition metal dichalcogenides.…”

Section: Discussionmentioning

confidence: 99%

Charge density wave and superconductivity competition in Lu5Ir4Si10 : A proton irradiation study

et al. 2020

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Real-space modulated charge density waves (CDW) are a ubiquitous feature in many families of superconductors. In particular, how CDW relates to superconductivity is an active and open question that has recently gathered much interest since CDWs have been discovered in many cuprates superconductors. Here we show that disorder induced by proton irradiation is a full-fledged tuning parameter that can bring essential information to answer this question as it affects CDW and superconductivity with different and unequivocal mechanisms. Specifically, in the model CDW superconductor Lu 5 Ir 4 Si 10 that develops a 1D CDW below 77 K and s-wave superconductivity below 4 K, we show that disorder enhances the superconducting critical temperature T c and H c2 while it suppresses the CDW. Discussing how disorder affects both superconductivity and the CDW, we make a compelling case that superconductivity and CDW are competing for electronic density of states at the Fermi level in Lu 5 Ir 4 Si 10 , and we reconcile the results obtained via the more common tuning parameters of pressure and doping. Owing to its prototypical, 1D, Peierls type CDW and the s-wave, weak-coupling nature of its superconductivity, this irradiation study of Lu 5 Ir 4 Si 10 provides the basis to understand and extend such studies to the more complex cases of density waves and superconductivity coexistence in heavy fermions, Fe-based, or cuprates superconductors.

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Disorder-induced multifractal superconductivity in monolayer niobium dichalcogenides

Cited by 117 publications

References 60 publications

Nonreciprocal superconducting NbSe2 antenna

Nonreciprocal superconducting NbSe2 antenna

Recent Advances in 2D Superconductors

Charge density wave and superconductivity competition in Lu5Ir4Si10 : A proton irradiation study

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