Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1038/415025a | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Generation of Isolated Flat Bands with Tunable Numbers through Moiré Engineering.
Phys Rev Lett
December 2024
Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA and Quantum Materials and Sensing Institute, Northeastern University, Burlington, Massachusetts 01803, USA.
In contrast to the Dirac-cone materials in which the low-energy spectrum features a pseudospin-1/2 structure, Lieb and Dice lattices both host triply degenerate low-energy excitations. Here, we discuss moiré structures involving twisted bilayers of these lattices, which are shown to exhibit a tunable number of isolated flat bands near the Fermi level due to the bipartite nature of their structures. These flat bands remain isolated from the high-energy bands even in the presence of small higher-order terms and chiral-symmetry-breaking interlayer tunneling.
View Article and Find Full Text PDFObservation of vortices in a dipolar supersolid.
Nature
November 2024
Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck, Austria.
Supersolids are states of matter that spontaneously break two continuous symmetries: translational invariance owing to the appearance of a crystal structure and phase invariance owing to phase locking of single-particle wavefunctions, responsible for superfluid phenomena. Although originally predicted to be present in solid helium, ultracold quantum gases provided a first platform to observe supersolids, with particular success coming from dipolar atoms. Phase locking in dipolar supersolids has been investigated through, for example, measurements of the phase coherence and gapless Goldstone modes, but quantized vortices, a hydrodynamic fingerprint of superfluidity, have not yet been observed.
View Article and Find Full Text PDFGeometric Inhibition of Superflow in Single-Layer Graphene Suggests a Staggered-Flux Superconductivity in Bilayer and Trilayer Graphene.
Nano Lett
August 2024
School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
In great contrast to the numerous discoveries of superconductivity in layer-stacked graphene systems, the absence of superconductivity in the simplest monolayer graphene remains quite puzzling. Here, through realistic computation of the electronic structure, we identify a systematic trend that superconductivity emerges only upon alteration of the low-energy electronic lattice from the underlying honeycomb atomic structure. We then demonstrate that this inhibition can result from geometric frustration of the bond lattice that disables the quantum phase coherence of the order parameter residing on it.
View Article and Find Full Text PDFHiggs Oscillations in a Unitary Fermi Superfluid.
Phys Rev Lett
May 2024
Optical Sciences Centre, ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
Symmetry-breaking phase transitions are central to our understanding of states of matter. When a continuous symmetry is spontaneously broken, new excitations appear that are tied to fluctuations of the order parameter. In superconductors and fermionic superfluids, the phase and amplitude can fluctuate independently, giving rise to two distinct collective branches.
View Article and Find Full Text PDFEmergent normal fluid in the superconducting ground state of overdoped cuprates.
Nat Commun
June 2024
State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, P. R. China.
Article Synopsis
- - The disappearance of superconductivity in overdoped cuprates is debated, and this study uses scanning tunneling spectroscopy to explore quasiparticle interference in BiSrCuO at varying hole densities.
- - As doping increases, a unique arc-like quasiparticle interference pattern develops, even at zero bias, indicating a shift in behavior incompatible with traditional models of d-wave superconductivity.
- - The findings suggest that a new type of normal fluid arises from particle interactions, leading to a decrease in superfluid density and a suppression of superconductivity in overdoped cuprates.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!