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Moore MA. Droplet-scaling versus replica symmetry breaking debate in spin glasses revisited. Phys Rev E 2021; 103:062111. [PMID: 34271696 DOI: 10.1103/physreve.103.062111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 05/21/2021] [Indexed: 11/07/2022]
Abstract
Simulational studies of spin glasses since the early 2010s have focused on the so-called replicon exponent α as a means of determining whether the low-temperature phase of spin glasses is described by the replica symmetry breaking picture of Parisi or by the droplet-scaling picture. On the latter picture, it should be zero, but we shall argue that it will only be zero for systems of linear dimension L>L^{*}. The crossover length L^{*} may be of the order of hundreds of lattice spacings in three dimensions and approach infinity in six dimensions. We use the droplet-scaling picture to show that the apparent nonzero value of α when L<L^{*} should be 2θ, where θ is the domain wall energy scaling exponent. This formula is in reasonable agreement with the reported values of α.
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Affiliation(s)
- M A Moore
- Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
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2
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Caracciolo S, Fabbricatore R, Gherardi M, Marino R, Parisi G, Sicuro G. Criticality and conformality in the random dimer model. Phys Rev E 2021; 103:042127. [PMID: 34005949 DOI: 10.1103/physreve.103.042127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 04/05/2021] [Indexed: 11/07/2022]
Abstract
In critical systems, the effect of a localized perturbation affects points that are arbitrarily far from the perturbation location. In this paper, we study the effect of localized perturbations on the solution of the random dimer problem in two dimensions. By means of an accurate numerical analysis, we show that a local perturbation of the optimal covering induces an excitation whose size is extensive with finite probability. We compute the fractal dimension of the excitations and scaling exponents. In particular, excitations in random dimer problems on nonbipartite lattices have the same statistical properties of domain walls in spin glass. Excitations produced in bipartite lattices, instead, are compatible with a loop-erased self-avoiding random walk process. In both cases, we find evidence of conformal invariance of the excitations that is compatible with SLE_{κ} with parameter κ depending on the bipartiteness of the underlying lattice only.
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Affiliation(s)
- S Caracciolo
- Dipartimento di Fisica dell'Università di Milano, and INFN, sez. di Milano, Via Celoria 16, 20100 Milan, Italy
| | - R Fabbricatore
- Dipartimento di Fisica dell'Università di Milano, and INFN, sez. di Milano, Via Celoria 16, 20100 Milan, Italy
| | - M Gherardi
- Dipartimento di Fisica dell'Università di Milano, and INFN, sez. di Milano, Via Celoria 16, 20100 Milan, Italy
| | - R Marino
- Laboratoire de Théorie des Communications, EPFL, 1015, Lausanne, Switzerland
| | - G Parisi
- Dipartimento di Fisica, INFN-Sezione di Roma1, CNR-IPCF UOS Roma Kerberos, Sapienza Università di Roma, P. le A. Moro 2, I-00185, Rome, Italy
| | - G Sicuro
- Department of Mathematics, King's College London, London WC2R 2LS, United Kingdom.,IdePHICS Laboratory, EPFL, 1015, Lausanne, Switzerland
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Yeo J, Moore MA. Possible instability of one-step replica symmetry breaking in p-spin Ising models outside mean-field theory. Phys Rev E 2020; 101:032127. [PMID: 32289897 DOI: 10.1103/physreve.101.032127] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 03/09/2020] [Indexed: 11/07/2022]
Abstract
The fully connected Ising p-spin model has for p>2 a discontinuous phase transition from the paramagnetic phase to a stable state with one-step replica symmetry breaking (1RSB). However, simulations in three dimension do not look like these mean-field results and have features more like those which would arise with full replica symmetry breaking (FRSB). To help understand how this might come about we have studied in the fully connected p-spin model the state of two-step replica symmetry breaking (2RSB). It has a free energy degenerate with that of 1RSB, but the weight of the additional peak in P(q) vanishes. We expect that the state with full replica symmetry breaking (FRSB) is also degenerate with that of 1RSB. We suggest that finite-size effects will give a nonvanishing weight to the FRSB features, as also will fluctuations about the mean-field solution. Our conclusion is that outside the fully connected model in the thermodynamic limit, FRSB is to be expected rather than 1RSB.
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Affiliation(s)
- J Yeo
- Department of Physics, Konkuk University, Seoul 05029, Korea
| | - M A Moore
- Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
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Charbonneau P, Corwin EI, Fu L, Tsekenis G, van der Naald M. Glassy, Gardner-like phenomenology in minimally polydisperse crystalline systems. Phys Rev E 2019; 99:020901. [PMID: 30934253 DOI: 10.1103/physreve.99.020901] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Indexed: 06/09/2023]
Abstract
We report on a nonequilibrium phase of matter, the minimally disordered crystal phase, which we find exists between the maximally amorphous glasses and the ideal crystal. Even though these near crystals appear highly ordered, they display glassy and jamming features akin to those observed in amorphous solids. Structurally, they exhibit a power-law scaling in their probability distribution of weak forces and small interparticle gaps as well as a flat density of vibrational states. Dynamically, they display anomalous aging above a characteristic pressure. Quantitatively, this disordered crystal phase has much in common with the Gardner-like phase seen in maximally disordered solids. Near crystals should be amenable to experimental realizations in commercially available particulate systems and are to be indispensable in verifying the theory of amorphous materials.
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Affiliation(s)
- Patrick Charbonneau
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
- Department of Physics, Duke University, Durham, North Carolina 27708, USA
| | - Eric I Corwin
- Department of Physics, University of Oregon, Eugene, Oregon 97403, USA
| | - Lin Fu
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
| | - Georgios Tsekenis
- Department of Physics, University of Oregon, Eugene, Oregon 97403, USA
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Hicks CL, Wheatley MJ, Godfrey MJ, Moore MA. Gardner Transition in Physical Dimensions. PHYSICAL REVIEW LETTERS 2018; 120:225501. [PMID: 29906167 DOI: 10.1103/physrevlett.120.225501] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 01/19/2018] [Indexed: 06/08/2023]
Abstract
The Gardner transition is the transition that at mean-field level separates a stable glass phase from a marginally stable phase. This transition has similarities with the de Almeida-Thouless transition of spin glasses. We have studied a well-understood problem, that of disks moving in a narrow channel, which shows many features usually associated with the Gardner transition. We show that some of these features are artifacts that arise when a disk escapes its local cage during the quench to higher densities. There is evidence that the Gardner transition becomes an avoided transition, in that the correlation length becomes quite large, of order 15 particle diameters, even in our quasi-one-dimensional system.
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Affiliation(s)
- C L Hicks
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - M J Wheatley
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - M J Godfrey
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - M A Moore
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
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Wang W, Moore MA, Katzgraber HG. Fractal dimension of interfaces in Edwards-Anderson spin glasses for up to six space dimensions. Phys Rev E 2018; 97:032104. [PMID: 29776053 DOI: 10.1103/physreve.97.032104] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Indexed: 11/07/2022]
Abstract
The fractal dimension of domain walls produced by changing the boundary conditions from periodic to antiperiodic in one spatial direction is studied using both the strong-disorder renormalization group algorithm and the greedy algorithm for the Edwards-Anderson Ising spin-glass model for up to six space dimensions. We find that for five or fewer space dimensions, the fractal dimension is lower than the space dimension. This means that interfaces are not space filling, thus implying that replica symmetry breaking is absent in space dimensions fewer than six. However, the fractal dimension approaches the space dimension in six dimensions, indicating that replica symmetry breaking occurs above six dimensions. In two space dimensions, the strong-disorder renormalization group results for the fractal dimension are in good agreement with essentially exact numerical results, but the small difference is significant. We discuss the origin of this close agreement. For the greedy algorithm there is analytical expectation that the fractal dimension is equal to the space dimension in six dimensions and our numerical results are consistent with this expectation.
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Affiliation(s)
- Wenlong Wang
- Department of Theoretical Physics, Royal Institute of Technology, Stockholm 106 91, Sweden.,Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA
| | - M A Moore
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Helmut G Katzgraber
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA.,1QB Information Technologies, Vancouver, British Columbia, Canada V6B 4W4.,Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, New Mexico 87501, USA
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Moore MA, Read N. Multicritical Point on the de Almeida-Thouless Line in Spin Glasses in d>6 Dimensions. PHYSICAL REVIEW LETTERS 2018; 120:130602. [PMID: 29694168 DOI: 10.1103/physrevlett.120.130602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Indexed: 06/08/2023]
Abstract
The de Almeida-Thouless (AT) line in Ising spin glasses is the phase boundary in the temperature T and magnetic field h plane below which replica symmetry is broken. Using perturbative renormalization group (RG) methods, we show that, when the dimension d of space is just above six, there is a multicritical point (MCP) on the AT line, which separates a low-field regime, in which the critical exponents have mean-field values, from a high-field regime, where the RG flows run away to infinite coupling strength; as d approaches six from above, the MCP approaches the zero-field critical point exponentially in 1/(d-6). Thus, on the AT line, perturbation theory for the critical properties breaks down at a sufficiently large magnetic field even above 6 dimensions, as well as for all nonzero fields when d≤6, as was known previously. We calculate the exponents at the MCP to first order in ϵ=d-6>0. The fate of the MCP as d increases from just above six to infinity is not known.
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Affiliation(s)
- M A Moore
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
| | - N Read
- Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520-8120, USA
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