Replica Symmetry Breaking in Spin Glasses by Chandan Dasgupta
International Centre for Theoretical Sciences via YouTube
Overview
Syllabus
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Replica Symmetry Breaking in Spin Glasses
Awarded the Nobel Prize in Physics, 2021
Interacting spin systems
For J 0, antiferromagnetic ordering may occur
What are Spin Glasses?
Experimental results: 1 Cusp in the magnetic susceptibility
Frustration
Edwards-Anderson Model
Spin Glass Phase
Edwards-Anderson Model
Magnetic susceptibility
The Sherrington-Kirkpatrick Model
S-K Model contd.
Replica Symmetry Breaking contd.
The Paris Solution
The Paris Solution contd.
Physical Interpretation of the Paris Solution
Thouless-Anderson-Palmer Equations
TAP Equations contd.
Physical interpretation of RSB G. Parisi, Phys Rev Lett 50, 1946 1983
Physical interpretation of RSB contd.
Ultrametricity: The valleys are arranged in a hierarchical tree-like 'ultrametric' structure
Predictions of the Paris solution have been confirmed from simulations.
Does the Paris solution explain experimentally observed behaviour in real spin glasses?
Dynamics: Slow relaxation, hysteresis, memory effects, aging, ...
Significance of the Paris Solution
Associative Memory: Retrieval of stored information from partial knowledge [content addressable memory]
Congratulations to Giorgio Parisi!
Q&A
Taught by
International Centre for Theoretical Sciences