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Université de Fribourg

Tuning the metal-insulator transition in ${\mathrm{NdNiO}}_{3}$ heterostructures via Fermi surface instability and spin fluctuations

Dhaka, R. S. ; Das, Tanmoy ; Plumb, N. C. ; Ristic, Z. ; Kong, W. ; Matt, C. E. ; Xu, N. ; Dolui, Kapildeb ; Razzoli, Elia ; Medarde, M. ; Patthey, L. ; Shi, M. ; Radović, M. ; Mesot, Joël

In: Physical Review B, 2015, vol. 92, no. 3, p. 035127

We employed in situ pulsed laser deposition (PLD) and angle-resolved photoemission spectroscopy (ARPES) to investigate the mechanism of the metal-insulator transition (MIT) in NdNiO3 (NNO) thin films, grown on NdGaO3(110) and LaAlO3(100) substrates. In the metallic phase, we observe three-dimensional hole and electron Fermi surface (FS) pockets formed from strongly renormalized bands with...

Université de Fribourg

Reconstructing propagation networks with temporal similarity

Liao, Hao ; Zeng, An

In: Scientific Reports, 2015, vol. 5, p. 11404

Node similarity significantly contributes to the growth of real networks. In this paper, based on the observed epidemic spreading results we apply the node similarity metrics to reconstruct the underlying networks hosting the propagation. We find that the reconstruction accuracy of the similarity metrics is strongly influenced by the infection rate of the spreading process. Moreover, there is a...

Université de Fribourg

Energy spectral behaviors of communication networks of open-source communities

Yang, Jianmei ; Yang, Huijie ; Liao, Hao ; Wang, Jiangtao ; Zeng, Jinqun

In: PLOS ONE, 2015, vol. 10, no. 6, p. e0128251

Large-scale online collaborative production activities in open-source communities must be accompanied by large-scale communication activities. Nowadays, the production activities of open-source communities, especially their communication activities, have been more and more concerned. Take CodePlex C # community for example, this paper constructs the complex network models of 12 periods of...

Université de Fribourg

Theoretical and experimental determination of $L$-shell decay rates, line widths, and fluorescence yields in Ge

Guerra, Michel ; Sampaio, J. M. ; Madeira, T. I. ; Parente, F. ; Indelicato, Paul ; Marques, J. P. ; Santos, J. P. ; Hoszowska, Joanna ; Dousse, Jean-Claude ; Loperetti, L. ; Zeeshan, Faisal ; Müller, M. ; Unterumsberger, R. ; Beckhoff, Burkhard

In: Physical Review A, 2015, vol. 92, no. 2, p. 022507

Fluorescence yields (FYs) for the Ge L shell were determined by a theoretical and two experimental groups within the framework of the International Initiative on X-Ray Fundamental Parameters Collaboration. Calculations were performed using the Dirac-Fock method, including relativistic and QED corrections. The experimental value of the L3FYωL3 was determined at the Physikalisch-Technische...