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Consortium of Swiss Academic Libraries

The classification of endo-trivial modules

Carlson, Jon F. ; Thévenaz, Jacques

In: Inventiones mathematicae, 2004, vol. 158, no. 2, p. 389-411

Université de Fribourg

Areas of high conservation value at risk by plant invaders in Georgia under climate change

Slodowicz, Daniel ; Descombes, Patrice ; Kikodze, David ; Broennimann, Olivier ; Müller?Schärer, Heinz

In: Ecology and Evolution, 2018, vol. 8, no. 9, p. 4431–4442

Invasive alien plants (IAP) are a threat to biodiversity worldwide. Understanding and anticipating invasions allow for more efficient management. In this regard, predicting potential invasion risks by IAPs is essential to support conservation planning into areas of high conservation value (AHCV) such as sites exhibiting exceptional botanical richness, assemblage of rare, and threatened and/or...

Université de Fribourg

Island dynamics and anisotropy during vapor phase epitaxy of m-plane GaN

Perret, Edith ; Xu, Dongwei ; Highland, M. J. ; Stephenson, G. B. ; Zapol, P. ; Fuoss, P. H. ; Munkholm, A. ; Thompson, Carol

In: Applied Physics Letters, 2017, vol. 111, no. 23, p. 232102

Using in situ grazing-incidence x-ray scattering, we have measured the diffuse scattering from islands that form during layer-by-layer growth of GaN by metal-organic vapor phase epitaxy on the (101⎯⎯0)(101¯0)(101¯0) m-plane surface. The diffuse scattering is extended in the (0001)(0001)(0001) in-plane direction in reciprocal space, indicating a strong anisotropy with islands elongated...

Université de Fribourg

Mass-imbalanced ionic Hubbard chain

Sekania, Michael ; Baeriswyl, Dionys ; Jibuti, Luka ; Japaridze, George I.

In: Physical Review B, 2017, vol. 96, no. 3, p. 035116

A repulsive Hubbard model with both spin-asymmetric hopping (t↑≠t↓) and a staggered potential (of strength Δ) is studied in one dimension. The model is a compound of the mass-imbalanced (t↑≠t↓,Δ=0) and ionic (t↑=t↓,Δ>0) Hubbard models, and may be realized by cold atoms in engineered optical lattices. We use mostly mean-field theory to determine the phases and phase transitions...