24 research outputs found
Constrain relations for superfluid weight and pairings in a chiral flat band superconductor
Within ten years, flat band (FB) superconductivity has gained a huge interest
for its remarkable features and connection to quantum geometry. We investigate
the superconductivity in a FB system whose orbitals are inequivalent and in
which the gap and the quantum metric are tunable. The key feature of the
present theoretical study is to show a unique and simple constrain relation
that pairings obey. Furthermore, pairings and superfluid weight in partially
filled FB are shown to be controlled by those of the half-filled lattice. We
argue that the geometry of the lattice or the complexity of the hopping terms
have no impact on the features revealed in this work as far as the system is
bipartite.Comment: 9 pages, 6 figure
Universal relations in flat band superconducting bipartite lattices
Unconventional flat band (FB) superconductivity, as observed in van der Waals
heterostructures, could open promising avenues towards high-T materials.
Indeed, in FBs, pairings and superfluid weight scale linearly with the
interaction parameter, such an unusual behaviour justifies strategies to
promote FB engineering. Bipartite lattices (BLs) which naturally host FBs could
be particularly interesting candidates. By revealing a hidden symmetry of the
quasi-particle eigenstates, we demonstrate that pairings and superfluid weight
obey universal relations in BLs. Remarkably, these general properties are
insensitive to disorder as long as the bipartite character is protected.Comment: 5 figure
Tests on riveted joints in sheet duralumin
In making tension tests, the slippage of the joints was noted at three points across each joint. In addition, stress strain curves were obtained for plain tension specimens, and a chemical analysis was made of the sheet
Flat-band superconductivity in a system with a tunable quantum metric: The stub lattice
International audienc
Constrain relations for superfluid weight and pairings in a chiral flat band superconductor
Abstract Within ten years, flat band (FB) superconductivity has gained a huge interest for its remarkable features and connection to quantum geometry. We investigate the superconductivity in a FB system whose orbitals are inequivalent and in which the gap and the quantum metric are tunable. 
The key feature of the present theoretical study is to show a unique and simple constrain relation that pairings obey. 
Furthermore, pairings and superfluid weight in partially filled FB are shown to be controlled by those of the half-filled lattice.
We argue that the geometry of the lattice or the complexity of the hopping terms have no impact on the features revealed in this work as far as the system is bipartite
Universal relations in flat band superconducting bipartite lattices
5 figuresUnconventional flat band (FB) superconductivity, as observed in van der Waals heterostructures, could open promising avenues towards high-T materials. Indeed, in FBs, pairings and superfluid weight scale linearly with the interaction parameter, such an unusual behaviour justifies strategies to promote FB engineering. Bipartite lattices (BLs) which naturally host FBs could be particularly interesting candidates. By revealing a hidden symmetry of the quasi-particle eigenstates, we demonstrate that pairings and superfluid weight obey universal relations in BLs. Remarkably, these general properties are insensitive to disorder as long as the bipartite character is protected
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NACA Technical Notes
In making tension tests, the slippage of the joints was noted at three points across each joint. In addition, stress strain curves were obtained for plain tension specimens, and a chemical analysis was made of the sheet