Fluid States of Helium Adsorbed in Nanopores

Wada, Nobuo; Matsushita, Tomohiro; Hieda, Mitsunori; Toda, Ryo

doi:10.1007/s10909-009-9918-7

Cited by 21 publications

(13 citation statements)

References 66 publications

(219 reference statements)

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“…The SOI for the t 1u orbital can be enhanced by electron wave function partly extended to Rb atoms. The main part of the wave function on the Rb atom is 5s, but the 4p core orbital on Rb atom is induced by the asymmetric potential on the surface of C 60 . According to the model presented here, the rotational motion of 4p electron on Rb atom is expected to enhance the SOI in the t 1u orbital of C 60 in Rb 3 C 60 .…”

Section: Mott Insulator and Canted Antiferromagnetism In K-loaded Zeomentioning

confidence: 99%

“…Other guest materials are also loaded into porous materials. Quantum liquids of 4 He [60][61][62][63][64] and 3 He [65] are introduced into porous materials, and novel properties of superfluidity have been observed. Clusters of semiconducting materials and other metal elements, such as Se, PbI 2 , HgI 2 , BiI 3 , InP, etc., are also incorporated into zeolites and mesoporous materials, and novel properties related to the quantum confinement of electrons in nanoscale have been observed [58,[66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

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Electrons of alkali metals in regular nanospaces of zeolites

Nakano

Nozue

2017

Advances in Physics: X

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The s-electrons of alkali metals loaded into regular nanospaces (nanocages) of zeolite crystals display novel electronic properties, such as a ferrimagnetism, a ferromagnetism, an antiferromagnetism, an insulator-to-metal transition, etc., depending on the kind of alkali metals, their loading density, and the structure type of zeolite frameworks. These properties are entirely different from those in bulk alkali metals of freeelectrons. Alkali-metal clusters are stabilized in cages of zeolites, and new quantum states of s-electrons, such as 1s, 1p, and 1d states in the spherical quantum-well model, are formed. An electron correlation, a polaron effect, and an orbital degeneracy in the quantum states of s-electrons play critical roles in taking on the novel electronic properties. Electronic properties can be overviewed systematically by a coarse-grained model of localized s-electron states in cages based on the tightbinding approximation, followed by the t-U-S-n diagram of the correlated polaron system given by the so-called HolsteinHubbard Hamiltonian: an electron transfer energy through windows of cages (t), a Coulomb repulsion energy between two s-electrons in the same cage (U), a short-range electron-phonon interaction energy due to the cation displacements (S), and an average number of s-electrons per cage (n). Beyond the jellium background model of alkali-metal clusters, a huge spin-orbit interaction has been observed in the 1p degenerate orbitals of clusters, similarly to the Rashba mechanism. ARTICLE HISTORY

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Section: Mott Insulator and Canted Antiferromagnetism In K-loaded Zeomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrons of alkali metals in regular nanospaces of zeolites

Nakano

Nozue

2017

Advances in Physics: X

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“…Much exciting work remains to be done in the nanopore system including a more systematic study of the superfluid density which can be measured in bundles of tubes or pores via torsional oscillator techniques 45,46 . The construction of more realistic models that contain both commensuration and disorder potentials would also enhance the applicability of numerical simulations.…”

Section: Discussionmentioning

confidence: 99%

A Luttinger Liquid Core Inside Helium-4 Filled Nanopores

Maestro

2013

Series on Directions in Condensed Matter Physics

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As helium-4 is cooled below 2.17 K it undergoes a phase transition to a fundamentally new state of matter known as a superfluid which supports flow without viscosity. This type of dissipationless transport can be observed by forcing helium to travel through a narrow constriction that the normal liquid could not penetrate. Recent experiments have highlighted the feasibility of fabricating smooth pores with nanometer radii, that approach the truly one dimensional limit where it is believed that a system of bosons (like helium-4) may have startlingly different behavior than in three dimensions. The one dimensional system is predicted to have a linear hydrodynamic description known as Luttinger liquid theory, where no type of long range order can be sustained. In the limit where the pore radius is small, Luttinger liquid theory would predict that helium inside the channel behaves as a sort of quasi-supersolid with all correlations decaying as power-law functions of distance at zero temperature. We have performed large scale quantum Monte Carlo simulations of helium-4 inside nanopores of varying radii at low temperature with realistic helium-helium and helium-pore interactions. The results indicate that helium inside the nanopore forms concentric cylindrical shells surrounding a core that can be fully described via Luttinger liquid theory and provides insights into the exciting possibility of the experimental detection of this intriguing low dimensional state of matter. arXiv:1201.4869v1 [cond-mat.mes-hall]

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“…Adsorption energy of the 4 He adatoms and evolution of a uniform layer on the nanopore walls were observed by measuring pressure isotherms for the adsorption and heat capacity [13,21]. The dependence of the superfluidity on the dimensionality was studied for 4 He adsorbed in 1D and 3D nanopores (upper insets in Fig.…”

Section: Observation Of Superfluidity Of 4 He Nanotubesmentioning

confidence: 99%

Observation of superfluidity in two- and one-dimensions

Wada

Hieda

Toda

et al. 2013

Low Temperature Physics

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Even though there is no long-range-ordered state of a superfluid in dimensions lower than the threedimension (3D) such as bulk 4 He liquid, superfluidity has been observed for flat 4 He films in 2D and recently for nanotubes of 4 He in 1D by the torsional oscillator method. In the 2D state, in addition to the superfluid below the 2D Kosterlitz-Thouless transition temperature T KT , superfluidity is also observed in a normal fluid state above T KT , which depends strongly on the measurement frequency and the system size. In the 1D state of the nanotubes, superfluidity is directly observed as a frequency shift in the torsional oscillator experiment. Some calculations suggest a superfluidity of a 1D Bose fluid with a finite length, where thermal excitations of 2 -phase winding play the main role for superfluid onset of each tube. Dynamics of the 1D superfluidity is also suggested by observing the dissipation in the torsional oscillator experiment.

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Fluid States of Helium Adsorbed in Nanopores

Cited by 21 publications

References 66 publications

Electrons of alkali metals in regular nanospaces of zeolites

Electrons of alkali metals in regular nanospaces of zeolites

A Luttinger Liquid Core Inside Helium-4 Filled Nanopores

Observation of superfluidity in two- and one-dimensions

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