Quantum Size Effect of Cu Small Particles in Magnetic Field

The study of small particles or microclusters has been very active in recent years. When the particle size becomes smaller, its electronic properties deviate from those of bulk material and become size dependent. This phenomenon is refered to as the quantum size effect.One of the frequently used probes for studying the electronic states of small particles is the surface plasmon (SP) excitation. Genzel et al. studied the optical absorption peaks from silver particles in glass. They found a blue shift of the SP peak when the particle size becomes smaller (see Fig 2). Electron energy loss spectroscopy (EELS) studies have also been performed. Recently vom Felde et al. reported broad beam EELS with large momentum transfer from potassium particles embedded in a MgO matrix. They observed that the surface plasmon energy increases when particle size becomes smaller, and there is a positive dispersion for particles of size 40 Å.

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Quantum size effect in copper: NMR in small particles

Physical Review B ◽

10.1103/physrevb.11.3261 ◽

1975 ◽

Vol 11 (9) ◽

pp. 3261-3267 ◽

Cited By ~ 79

Author(s):

Philip Yee ◽

W. D. Knight

Keyword(s):

Size Effect ◽

Quantum Size Effect ◽

Small Particles ◽

Quantum Size

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Квантовый размерный эффект и осцилляции Шубникова–де Гааза в поперечном магнитном поле в полупроводниковых нитях Bi0,92Sb0,08

Elektronnaya Obrabotka Materialov ◽

10.52577/eom.2021.57.6.79 ◽

2021 ◽

Vol 57 (6) ◽

pp. 79-86

Author(s):

A.A. Nicolaeva ◽

◽

L.A. Conopco ◽

I.A. Popov ◽

G.I. Para ◽

...

Keyword(s):

Magnetic Field ◽

Size Effect ◽

Topological Insulator ◽

Energy Gap ◽

Surface States ◽

Quantum Size Effect ◽

Linear Dispersion ◽

Quantum Size ◽

Sdh Oscillations ◽

The Wire

The transport properties, magnetoresistance, and Shubnikov–de Haas (SdH) oscillations of glass-coated Bi0.92Sb0.08 single-crystal wires with diameters of 180 nm to 2.2 mm and the (1011) orientation along the wire axis, which are prepared by liquid phase casting, have been studied. For the first time, it has been found that the energy gap DE increases by a factor of 4 with a decrease in the wire diameter d owing to the manifestation of the quantum size effect. This significant increase in the energy gap can occur under conditions of an energy–momentum linear dispersion relation, which is characteristic of both the gapless state and the surface states of a topological insulator. It has been shown that, in a strong magnetic field at low temperatures, a semiconductor–semimetal transition occurs; it is evident in the temperature dependences of resistance in a magnetic field. An analysis of the SdH oscillations, namely, the phase shift of the Landau levels and the features of the angular dependences of the oscillation periods, suggests that the combination of the manifestation of the topological insulator properties and the quantum size effect leads to the occurrence of new effects in low-dimensional structures, which requires new scientific approaches and applications in microelectronics

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