Vibrational properties of Na nanoclusters self-assembled on Si(111) surface

Hwang, Choongyu; Kim, N.D.; Shin, Sang‐Wan; Chung, Jin Woo; Nam, Jae Do; Kim, M.K.; Park, C.-Y.; Ahn, Joung Real

doi:10.1016/j.susc.2008.05.011

Cited by 4 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The magic nanocluster has two surface states, denoted by M1 (binding energy = 0.45 eV) and M2 (1.1 eV), as shown in figure 1(c) [26]. Above the second critical θ Na of 0.22 ML, the 2D array of the magic nanoclusters irreversibly changes into a disordered phase [28], where the critical θ Na of the phase transition from the gas phase to the 2D array of magic clusters will hereafter be called the first critical θ Na . The disorder phase has a surface state, denoted by D1, with a binding energy of 1.5 eV [26].…”

Section: Resultsmentioning

confidence: 99%

Temperature dependence of the electronic structure of two-dimensional Na gas on the Si(111)-7 × 7 surface

Shin¹,

Seo²,

Yeom³

et al. 2013

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The temperature dependence of the irreversible phase transition from a two-dimensional gas to an ordered zero-dimensional solid on the Si(111)-7 × 7 surface was studied using photoemission spectroscopy. With increasing Na coverage, the two-dimensional Na gas, which is a state of highly mobile Na atoms, undergoes a phase transition into ordered zero-dimensional magic nanoclusters at room temperature. The critical Na coverage of the phase transition was found to increase with reduced temperature. This was used to develop a gas-solid phase diagram of Na atoms on the Si(111)-7 × 7 surface as a function of Na coverage and sample temperature based on the electronic structure. The temperature dependence of the phase transition can be ascribed to the suppression of the thermal energy that is required to overcome the energetic barrier between the two-dimensional gas and the zero-dimensional solid at low temperature, where three different hopping mechanisms are related to the phase transition.

show abstract

Section: Resultsmentioning

confidence: 99%

Temperature dependence of the electronic structure of two-dimensional Na gas on the Si(111)-7 × 7 surface

Shin¹,

Seo²,

Yeom³

et al. 2013

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…The most advanced results have been sofar obtained with the surface magic clusters of group-III metals (Al, Ga, and In) [2][3][4][5][6] and some other metals (e.g., Na, Pb, and Cu) [7][8][9][10] on crystalline Si surfaces (mainly, on Si(1 1 1)7 Â 7 surface). For these cluster arrays, a number of the profound results have recently been obtained, including elucidation of their specific electronic properties [8,[11][12][13][14][15] foundation of their pronounced catalytic activity [16], finding the possibilities to modify composition, structure and properties of the clusters [17][18][19], demonstrating the prospects of the cluster as a prototype of the atomic-scale device [20].…”

Section: Introductionmentioning

confidence: 99%