Hans Christian Öttinger. Department of Materials, ETH Zürich, Switzerland
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1 Lessons from NonequilibriumThermodynamics: Flow-Driven Glasses Hans Christian Öttinger Department of Materials, ETH Zürich, Switzerland
2 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond)
3 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy
4 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy Poisson structures (used to generate reversible dynamics) contain only static information
5 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy Poisson structures (used to generate reversible dynamics) contain only static information The geometric structure of isolated systems has direct consequences for open systems (Poisson brackets, Lie groups & Lie algebras, semidirect products)
6 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy Poisson structures (used to generate reversible dynamics) contain only static information The geometric structure of isolated systems has direct consequences for open systems (Poisson brackets, Lie groups & Lie algebras, semidirect products) Poisson brackets suggest a static indicator for the onset of the glass transition
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9 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy Poisson structures (used to generate reversible dynamics) contain only static information The geometric structure of isolated systems has direct consequences for open systems (Poisson brackets, Lie groups & Lie algebras, semidirect products) Poisson brackets suggest a static indicator for the onset of the glass transition
10 Approach to Nonequilibrium Thermodynamics Step Equilibrium Nonequilibrium 1 work vs heat reversible vs irreversible dynamics 2 3 4
11 Approach to Nonequilibrium Thermodynamics Step Equilibrium Nonequilibrium 1 work vs heat reversible vs irreversible dynamics 2 3 de = δw + δq dx = v dt reversible + v irreversible 4
12 Approach to Nonequilibrium Thermodynamics Step Equilibrium Nonequilibrium 1 work vs heat reversible vs irreversible dynamics de = δw + δq dx = v dt reversible + v irreversible de = pdv + μdn + δq dx = L δh dt δx v irreversible
13 Approach to Nonequilibrium Thermodynamics Step Equilibrium Nonequilibrium 1 work vs heat reversible vs irreversible dynamics de = δw + δq dx = v dt reversible + v irreversible de de = pdv + μdn + δq dx = L δh dt δx v irreversible = pdv + μdn + TdS dx = L δh M δs dt δx δx
14 GENERIC Structure General equation for the nonequilibrium reversible-irreversible coupling metriplectic structure (P. J. Morrison, 1986) Lx ( ) dx = Lx ( ) dt δe ( x) δx + Mx ( ) δs( x) = 0 Mx ( ) δx L antisymmetric, Jacobi identity δs ( x) δx δe( x) = 0 δx M Onsager/Casimir symm., positive-semidefinite
15 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy Poisson structures (used to generate reversible dynamics) contain only static information The geometric structure of isolated systems has direct consequences for open systems (Poisson brackets, Lie groups & Lie algebras, semidirect products) Poisson brackets suggest a static indicator for the onset of the glass transition
16 Statistical Mechanics: Energy & Entropy E = E 0 x relative entropy
17 Think About Entropy Has this messy room a large or small entropy?
18 Statistical Mechanics: Friction Matrix τ 1 M jk = Π k( 0)Π j () xdt k B 0 f f t Green-Kubo Π j x = x j 1 M jk = Δ 2k B τ τ Π j Δ τ Π k x Einstein cf. D = ( Δx) 2 2Δt τ 1 τ2
19 Poisson Operator L jk = { Π j, Π k } x L contains only static information Selection of the structural variables is needed L describes convection behavior (deformation)
20 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy Poisson structures (used to generate reversible dynamics) contain only static information The geometric structure of isolated systems has direct consequences for open systems (Poisson brackets, Lie groups & Lie algebras, semidirect products) Poisson brackets suggest a static indicator for the onset of the glass transition
21 Poisson Structure Lie group: space transformations Semidirect products: action of the group of space transformations on structural variables Lie algebra: velocity fields Dual of the Lie algebra: momentum density fields
22 Poisson Structure Lie group: space transformations Lie algebra: velocity fields Semidirect products: action of the group of space transformations on structural variables open system Dual of the Lie algebra: momentum density fields driving device
23 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy Poisson structures (used to generate reversible dynamics) contain only static information The geometric structure of isolated systems has direct consequences for open systems (Poisson brackets, Lie groups & Lie algebras, semidirect products) Poisson brackets suggest a static indicator for the onset of the glass transition
24 A Vision of Glasses inherent structures Debenedetti & Stillinger, Nature 410 (2001) 259
25 Nonequilibrium Thermodynamics Variable Structural variable: inherent structure pair correlation function g is ( rr, ). Study rearrangements for energy minimization after deformation!
26 Nonequilibrium Thermodynamics Variable Structural variable: inherent structure pair correlation function g is ( rr, ). Study rearrangements for energy minimization after deformation! at onset of glassy dynamics melt [enhancement factor 600] [enhancement factor 14] 2d E. Del Gado, P. Ilg, M. Kröger, hco, Phys Rev Lett 2008 γ = 0.001
27 Nonequilibrium Thermodynamics Order Parameter? normalized mean magnitude of rearrangements E. Del Gado, P. Ilg, M. Kröger, hco, Phys Rev Lett d spatially modulated
28 Summary & Conclusions Geometry suggests thermodynamics (at equilbrium & far beyond) Deriving thermodynamics is difficult, formulating it is easy Poisson structures (used to generate reversible dynamics) contain only static information The geometric structure of isolated systems has direct consequences for open systems (Poisson brackets, Lie groups & Lie algebras, semidirect products) Poisson brackets suggest a static indicator for the onset of the glass transition
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