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Simulating & Understanding Quantum Spin Liquids

April 17, 2017 - 11:00am
Speaker: 
Anna Sanpera
Institution: 
Universitat Autònoma de Barcelona
Disordered quantum antiferromagnets in two-dimensional compounds have been a focus of interest
in the last years due to their exotic properties. However, with very few exceptions, the ground states
of the corresponding Hamiltonians are notoriously difficult to simulate making their characterization
and detection very elusive, both, theoretically and experimentally. Here we propose a method to signal
quantum disordered antiferromagnets by doing exact diagonalization in small lattices using random
boundary conditions and averaging the observables of interest over the different disorder realizations.
We use our method to analyze the competition between frustration and quantum fluctuations arising
in some models that might lead to some spin liquid phases as predicted from different methods ranging from spin wave mean field theory to 2D-DMRG or PEPS. 
2400 CSS Bldg