Questions tagged [disorder]

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8 votes
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Why do we disorder-average before/after taking the logarithm of the partition function for annealed/quenched disorder?

Pg. 19 of these notes says Crucially, the [disorder] average $\overline{\log Z}$ has to be computed after taking the logarithm. Such an average is called quenched ... Computing the average first, ...
tparker's user avatar
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3 votes
1 answer
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Physical understanding of Anderson (disorder) localisation

My current understanding is that waves in disordered potentials experience localisation due to interference effects. (eg an electron in a disordered medium tries to take different paths of effectively ...
user12800's user avatar
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3 votes
1 answer
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References for prerequisite material for understanding papers on Generalized Global Symmetries

I want to understand the papers https://arxiv.org/abs/1412.5148 and https://arxiv.org/abs/1703.00501. Assuming that I understand basics of gauge theories, could someone suggest some references ...
7 votes
1 answer
1k views

Quenched systems - disorder average (SYK model)

In a system with quenched disorder one is usually looking for self-averaging quantities, i.e., quantities such that the average over the couplings produces a ``typical" configuration in the ...
Lurianus's user avatar
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4 votes
1 answer
504 views

What are disorders in condensed matter parlance?

Condensed matter physicists often use the term disorder. What is a disorder? Is it some point defect or line defect? How are they modelled in a theory?
SRS's user avatar
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2 votes
1 answer
246 views

Fractal structure in colloidal systems

In describing the configuration of a colloidal system, one often deals with either, disordered fluid states, disordered jammed states or crystalline states (so an underlying lattice structure), but in ...
user929304's user avatar
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2 votes
3 answers
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Are complexity and disorder correlated in entropy?

I am coming from the musical field, but I am looking into the topic of entropy. In many articles from the field of physics, I keep finding what I consider a sort of misunderstanding, but I may be ...
TakeMeToTheMoon's user avatar
1 vote
0 answers
245 views

Derivation of the gradient expansion of the Keldysh nonlinear sigma model for disorder metals

My confusion relates to Appendix C of this this paper although the same derivation is presented in many others. When deriving the gradient expansion of this term arrives at a term quadratic in the ...
Zach R.'s user avatar
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