Reinvestigation of the rotation effect in solid 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math>
 with a rigid torsional oscillator

Choi, Jaewon; Tsuiki, Tomoya; Takahashi, Daisuke; Choi, Hyoungsoon; Kono, Kimitoshi; Shirahama, Keiya; Kim, Eunseong

doi:10.1103/physrevb.98.014509

Cited by 5 publications

(3 citation statements)

References 46 publications

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“…2 in the Supplemental Material). The absence of a "tilted" or "composite" background [34,35] confirms that our TO adopting rigid design principle is unaffected by the complicated viscoelastic coupling between the 4 He films and TO body, observed in other nonrigid TOs [16][17][18]. As n increases to 18.23 atoms/nm 2 , ρ s reaches its maximum value of ∼0.9 %.…”

supporting

confidence: 62%

Spatially Modulated Superfluid State in Two-Dimensional $^4$He Films

Choi,

Zadorozhko,

Choi

et al. 2021

Preprint

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The second layer of 4 He films adsorbed on a graphite substrate is an excellent experimental platform to study the interplay between superfluid and structural orders. Here, we report a rigid twofrequency torsional oscillator study on the second layer as a function of temperature and 4 He atomic density. We find that the superfluid density is independent of frequency, which can be interpreted as unequivocal evidence of genuine superfluidity. The phase diagram established in this work reveals that a superfluid phase coexists with hexatic density-wave correlation and a registered solid phase. This suggests the second layer as a candidate for hosting two exotic quantum ground states: the spatially modulated superfluid and supersolid phases, resulting from the interplay between superfluid and structural orders.

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supporting

confidence: 62%

Spatially Modulated Superfluid State in Two-Dimensional $^4$He Films

Choi,

Zadorozhko,

Choi

et al. 2021

Preprint

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“…The increase can be rather drastic, up to 20%. This increase in the shear modulus mimics the increase of the frequency [64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81]. Thermal conductivity in polycrystalline hexagonal close packed (hcp) 4 He also increases [82].…”

Section: Shear Modulus Stiffeningmentioning

confidence: 83%

Saga of Superfluid Solids

Yukalov

2020

Physics

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“…Unfortunately, follow up experiments supported by the vast majority of theoretical works proved that the ground state of bulk solid 4 He is not a superfluid. We now have strong evidence that 4 He can be found in either a superfluid or a crystalline phase, but the two phases do not coexist [13]. The next candidate is naturally a Bose-Einstein condensate realized with cold atoms.…”

Section: Introductionmentioning

confidence: 93%

Dynamical structure factor of a fermionic supersolid on an optical lattice

Vitali,

Kelly,

Lopez

et al. 2019

Preprint

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We perform a Quantum Monte Carlo study of a spin-balanced two-dimensional cold Fermi gas on an optical lattice, which can be experimentally realized with laser standing waves. The system is modeled with a Hubbard hamiltonian with on-site attractive interaction. At half-filling, when on average one fermion occupies each lattice site, the system displays an intriguing supersolid phase: a superfluid with a checkerboard density modulation. Interfacing unbiased Auxiliary-Field Monte Carlo simulations with state-of-art analytic continuation techniques, we compute the density dynamical structure factor S(q, ω) of the system, in order to characterize the dynamical properties of this supersolid phase. We find evidence of the existence of two collective modes, which we interpret as arising from the two broken symmetries in the system: s-wave pairing superfluidity coexists with a non-uniform local density. The mapping U → −U in the Hubbard model makes these results important for the repulsive model as well. Furthermore, this work paves the way for an investigation of the behavior of the model when we move away from half-filling, either changing the density or introducing a spin polarization.

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Reinvestigation of the rotation effect in solid He4 with a rigid torsional oscillator

Cited by 5 publications

References 46 publications

Spatially Modulated Superfluid State in Two-Dimensional $^4$He Films

Spatially Modulated Superfluid State in Two-Dimensional $^4$He Films

Saga of Superfluid Solids

Dynamical structure factor of a fermionic supersolid on an optical lattice

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