pdf, 9 MiB - Infoscience - EPFL
pdf, 9 MiB - Infoscience - EPFL
pdf, 9 MiB - Infoscience - EPFL
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Acknowledgments<br />
The biggest thank goes to Frédéric Mila and Thierry Giamarchi, who gave me the<br />
opportunity to engage a doctoral thesis at IRRMA. Special thanks goes also to<br />
Andreas Martin Lauechli. I am grateful not only for their scientific guidance, but<br />
also for their effort to make our discussions very alive and more generally for the<br />
nice time that I spent in the respective groups of Irrma, UniGe and ITP-<strong>EPFL</strong>.<br />
During these four years and a half, they were particularly involved in all the<br />
work done in the chapters presented in this dissertation. Moreover, I had also<br />
the chance to collaborate and discuss with other distinguished physicists. I am<br />
especially thinking to Michel Ferrero and Federico Becca, with whom I spent some<br />
nice time at the Sissa (Trieste, Italy). I also enjoyed working in collaboration with<br />
Didier Poilblanc and Sylvain Caponi (Irsamc, Toulouse, France), that have hosted<br />
me very nicely in Toulouse for a short visit. I also thank a lot Claudius Gross<br />
and Walter Hofstetter (Frankfurt, Germany) that have allowed me to come and<br />
visit them in Frankfurt. The scientific discussions were very motivating. Special<br />
thanks also to Werner Krauth (Paris) who explained to me the scientific activity<br />
of his group. Finally, I would like to thank Chandra Varma (Irvine, USA) for<br />
past and ongoing discussions related to the presence of orbital currents in the<br />
pseudogap phase of the cuprates. I detail here further who was involved in the<br />
work of the chapters of the dissertation:<br />
Chapter 3: I am very grateful to Michel Ferrero and Federico Becca for discussions<br />
about the Pfaffians, that are used to sample the wave-function having noncollinear<br />
magnetism.<br />
Chapter 4: The credits of the RVB mean field theory in this chapter is entirely due<br />
to Thomas Gloor. Moreover, the quantum Monte-Carlo results, shown in<br />
this chapter as a comparison with the variational Monte-Carlo results, were<br />
done by the work of Thomas Gloor and Andreas Martin Laeuchli.<br />
Chapter 5: This was a collaboration with Didier Poilblanc and Sylvain Caponi. Everything<br />
related to the mean-field calculations done in this chapter is due to<br />
their impressive work.<br />
Chapter 6: I could profit from the experience of Andreas Laeuchli, who helped me to<br />
understand in details the exact diagonalization calculations. We could also<br />
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