Optical properties of potassium clusters incorporated into zeolite LTA

Kodaira, Tetsuya; Nozue, Yasuo; Ohwashi, Satoshi; Goto, T.; Terasaki, Osamu

doi:10.1103/physrevb.48.12245

Cited by 78 publications

(72 citation statements)

References 48 publications

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“…A similar ferromagnetic superexchange interaction can be assumed between β-cage clusters via the 109.5 • orthogonalized sp 3 orbitals with the T d symmetry of supercage clusters in the ferromagnetism of K n /Na 7.3 K 4.7 -LSX. A similar electron correlation in the sp 3 hybridized state has been calculated in CH 4 molecule [108,109].…”

Section: Ferrimagnetism and Ferromagnetism In Na-k Alloy System In Zementioning

confidence: 48%

“…Numbers in parentheses indicate degeneracies including spin. Optical excitations from 1s to 1p and from 1p to 1d quantum states have been observed [3]. Successive occupations of s-electrons at 1s and 1p quantum states configure a shell model of clusters with the increase in the number of guest alkali atoms, where the first two and the next six s-electrons are for 1s and 1p states, respectively.…”

Section: Introductionmentioning

confidence: 97%

“…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%

“…For the charge neutrality, 12M cations per α-cage are distributed in the spaces of framework. The effective confinement size for s-electrons is basically given by that of the α-cage, ≈11 Å [3,24]. As the interior of α-cage is nearly spherical, a confinement of an s-electron is simplified by a free electron in the spherical quantum-well potential.…”

Section: Introductionmentioning

confidence: 99%

“…A new paradigm of electronic system can be provided by the alkali-metal loading into zeolites. Up to now, comprehensive researches have been carried out , especially on magnetic properties [1,2,9,11,[13][14][15][16][17][18][23][24][25][26][27][28][29][30][31][34][35][36][37]39,41,[43][44][45][46]48,50,51], optical properties [1,3,7,24,38,49,53], electrical properties [42,43,49,50,52,53], structural analyses [8,12,22,47] and theoretical calculations …”

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: Ferrimagnetism and Ferromagnetism In Na-k Alloy System In Zementioning

confidence: 48%

Section: Introductionmentioning

confidence: 97%