Adiabatic continuity and broken symmetry in many-electron systems: A variational perspective
- Baeriswyl, Dionys Département de Physique, Université de Fribourg, Switzerland
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13.09.2011
Published in:
- Annalen der Physik. - 2012, vol. 523, no. 8-9, p. 724–731
English
Variational wave functions are very useful for describing the panoply of ground states found in interacting many-electron systems. Some particular trial states are “adiabatically” linked to a reference state, from which they borrow the essential properties. A prominent example is the Gutzwiller ansatz, where one starts with the filled Fermi sea. A simple soluble example, the anisotropic XY chain, illustrates the adiabatic continuity of this class of wave functions. To describe symmetry breaking, one has to modify the reference state accordingly. Alternatively, a quantum phase transition can be described by a pair of variational wave functions, starting at weak and strong coupling, respectively.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 28292
- DOI 10.1002/andp.201100044
- Persistent URL
- https://folia.unifr.ch/unifr/documents/302315
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