We developed a theory underlying the relationship between quantum size effect

1. Interplay of Quantum Size Effect and Classical Strain Effecton Growth of Nanoscale Metal Thin Films Feng Liu, University of Utah, DMR 0909212 (a) z g0Q(d)s Q(d) • We developed a theory underlying the relationship between quantum size effect • (QSE) and classical strain effect on the stability of metal nanofilms in the quantum regimes, which has been validated and confirmed by first-principles calculations. • Introduce the concept of “quantum stress” to elucidate extrinsic electronic effects, e.g. QSE on the stress state of nanofilms and solids. • Develop the theoretical framework to describe the interplay of QSE and strain effect on the stability of metal nanofilms (fig. (a)). • Perform first-principles calculations of quantum oscillations in the surface stress of Pb(111) nanofilms (fig.(b)). • Predict stability of Pb(111) nanofilms under strain conditions. yn d (b)

2. Interplay Between Quantum Size Effect and Strain Effect on Growth of Nanoscale Metal Thin Films Feng Liu, University of Utah, DMR 0909212 • One graduate student (Miao Liu) has been trained research-wise in the area of epitaxial growth of metal nanofilms, and technically in performing extensive first-principles calculations of Pb(111) thin-film stability in the quantum regime as proposed. • As a MWN program, the graduate student, Miao Liu, visited Prof. Q.K. Xue group in the Physics Department of Tsinghua University for three months as part of the planned MWN international collaboration. • Some of our recent research results are being incorporated into a course of “computational materials science” taught by PI at University of Utah • PI is serving on the organizing committee of the Richmond Conference "International Symposium on Clusters and Nanostructures" (ISCAN) to be held in Richmond, VA during November 7-10, 2011.