How could a solid be superfluid
TL;DR: In this article, it was shown that mass can flow through solid helium-4 without viscous resistance, thanks to defects in the crystal lattice, as in a superfluid.
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Abstract: Experiments indicate that, as in a superfluid, mass can flow through solid helium-4 without viscous resistance. Recent calculations shed light on how this may happen thanks to defects in the crystal lattice.
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Citations
Thermo-mechanical behavior of low-dimensional systems: The local bond average approach
TL;DR: Local bond average (LBA) as mentioned in this paper has been proposed to compare the measurable quantities of a specimen to the identities of its representative bonds and the energetic responses of these bonds (bond nature, order, length and strength) to external stimuli, such as changes in temperatures and coordination environments.
302
Stacking Fault Energy in 4He Crystals
TL;DR: In this paper, the authors measured the energy of the stacking fault in an hcp 4He crystal at 0.2 K. The obtained value for the SF energy is (0.07±0.02) mJ/m2, which is ∼ 0.4 of the surface tension of the liquid-solid interface of 4He.
7
Hydrodynamics of superfluids confined in blocked rings and wedges
Chandan Dasgupta,Oriol T. Valls +1 more
TL;DR: A study of the hydrodynamics of a superfluid confined in the two-dimensional region between two concentric arcs of radii b and a subtending an angle beta, which implies the presence of either a region of normal fluid or a vortex for any nonzero value of the angular velocity.
5
Quantum phases and particle correlations in a honeycomb lattice
Eva-Maria Richter
- 24 Mar 2016
TL;DR: In this paper, the Bose-Hubbard model is used in concert with an exact diagonalization method, to get access to correlations, wavelengths and energies of the discrete system, which can be interpreted as next neighbor z-correlations of iso-spins associated with the different particle sorts.
4
Graphene-like Be 3 X 2 (X = C, Si, Ge, Sn): A new family of two-dimensional topological insulators
TL;DR: Based on the configuration of Be3C2, which has been reported to be a 2D Dirac material, the other three 2D materials and confirm their stability according to their chemical bonding properties and phonon dispersion relationships as mentioned in this paper.
References
Probable observation of a supersolid helium phase
Eunseong Kim,M. H. W. Chan +1 more
TL;DR: Torsional oscillator measurements on solid helium confined in a porous medium find an abrupt drop in the rotational inertia of the confined solid below a certain critical temperature and show that all three states of matter—gas, liquid and solid—can undergo Bose–Einstein condensation.
992
Low-temperature shear modulus changes in solid 4He and connection to supersolidity
James Day,John Beamish +1 more
TL;DR: A measurement of the shear modulus of solid 4He at low frequencies and strains is reported, to explain this unusual elastic behaviour in terms of a dislocation network that is pinned by 3He at the lowest temperatures but becomes mobile above 100 mK.
364
Wetting Properties of Grain Boundaries in Solid 4He.
TL;DR: It is found that, when emerging at the liquid-solid interface, a grain boundary makes a groove whose dihedral angle 2theta is nonzero, which shows that grain boundaries are not completely wet by the liquid phase, in agreement with recent Monte Carlo simulations.
44
Local stress and superfluid properties of solid 4He.
Lode Pollet,Massimo Boninsegni,Anatoly Kuklov,Nikolai Prokof'ev,Nikolai Prokof'ev,Nikolai Prokof'ev,Boris Svistunov,Boris Svistunov,Matthias Troyer +8 more
TL;DR: This work provides a semiquantitative tool, derived from first-principles simulations, for answering the question of whether certain types of defects in solid 4He support mass superflow.
Luttinger Liquid in the Core of a Screw Dislocation in Helium-4
Massimo Boninsegni,Anatoly Kuklov,Lode Pollet,Nikolai Prokof'ev,Nikolai Prokof'ev,Boris Svistunov,Boris Svistunov,Matthias Troyer +7 more
TL;DR: This is the first example of a regular quasi-one-dimensional supersolid--the phase featuring both translational and superfluid orders, and one of the cleanest cases of a Luttinger-liquid system.
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