Superconductivity: how the unconventional became the new norm

Weitering, Hanno H.; Wu, Judy

doi:10.1088/1361-6668/aa5c49

Cited by 5 publications

(3 citation statements)

References 28 publications

(56 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We note here that the carrier concentration of our sample is two-orders higher in magnitude compared to the minimum carrier concentration reported for the observation of 2D superconductivity in ionic-liquid gated MoS2 29 . In addition, the sheet resistance of our sample is considerably lower than the resistance quantum, h/(2e) 2 , the upper limit to observe 2D superconductivity 3 .…”

Section: Resultsmentioning

confidence: 79%

“…Systems with reduced dimensions provide an opportunity to test fundamental theorems, formulate new ones and access new technologies. The search for non-Abelian quantum Hall systems in one-dimensional constrictions 1 and superconductivity in two-dimensions (2D) 2,3 are a few to mention. Mermin-Wagner theorem forbids any kind of ordering and spontaneous symmetry breaking in dimensions !…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

2D superconductivity and vortex dynamics in 1T-MoS2

et al. 2018

View full text Add to dashboard Cite

Two-dimensional (2D) superconductivity is a fascinating phenomenon packed with rich physics and wide technological application. The vortices and their dynamics arising from classical and quantum fluctuations give rise to Berezinskii-Kosterlitz-Thouless (BKT) transition and 2D Bose metallic phase both of which are of fundamental interest. In 2D, observation of superconductivity and the associated phenomena are sensitive to material disorders. Highly crystalline and inherently 2D van der Waals (vW) systems with carrier concentration and conductivity approaching metallic regime have been a potential platform. The metallic 1T phase of MoS2, a widely explored vW material system controllably, engineered from the semiconducting 2H phase, is a tangible choice. Here, we report the observation of 2D superconductivity accompanied by BKT transition and Bose metallic state in a few-layer 1T-MoS2. Structural characterization shows excellent crystallinity over extended lateral dimension. The electrical characterization confirms the metallic nature down to 4 K and a transition to a superconducting state below 1.2 K with a Tc ~ 920 mK. The 2D nature of the superconducting state is confirmed from the magneto-transport anisotropy against field orientations and the presence of BKT transition. In addition, our sample showcases a manifold increase in the parallel upper-critical-field above the Pauli limit. The inherent twodimensionality and possibility of scalably engineering semiconducting, metallic and superconducting phases makes MoS2 a potential candidate for hosting monolithic all-twodimensional hybrid quantum devices.

show abstract

Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

2D superconductivity and vortex dynamics in 1T-MoS2

et al. 2018

View full text Add to dashboard Cite

show abstract

“…uperconductivity in reduced dimensions has attracted great attention since it is not only of importance for exploring attractive quantum phenomena at a novel state but also for potential application for developing superconducting electronics 1,2 . Recently, several new two-dimensional (2D) ultrathin superconducting systems have been realized in different materials and hetero-interfaces [3][4][5][6][7][8][9] .…”

mentioning

confidence: 99%

Two-dimensional superconductivity and magnetotransport from topological surface states in AuSn4 semimetal

et al. 2020

View full text Add to dashboard Cite

Topological materials such as Dirac or Weyl semimetals are new states of matter characterized by symmetry-protected surface states responsible for exotic low-temperature magnetotransport properties. Here, transport measurements on AuSn 4 single crystals, a topological nodal-line semimetal candidate, reveal the presence of two-dimensional superconductivity with a transition temperature T c~2 .40 K. The two-dimensional nature of superconductivity is verified by a Berezinsky-Kosterlitz-Thouless transition, Bose-metal phase, and vortex dynamics interpreted in terms of thermally-assisted flux motion in two dimensions. The normal-state magnetoconductivity at low temperatures is found to be well described by the weak-antilocalization transport formula, which has been commonly observed in topological materials, strongly supporting the scenario that normal-state magnetotransport in AuSn 4 is dominated by the surface electrons of topological Dirac-cone states. The entire results are summarized in a phase diagram in the temperature-magnetic field plane, which displays different regimes of transport. The combination of twodimensional superconductivity and surface-driven magnetotransport suggests the topological nature of superconductivity in AuSn 4 .

show abstract