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1. Coupling between long ranged repulsions and short ranged attractions in a colloidal model of zero shear rate viscosity

   https://doi.org/10.1122/8.0000387  

   Tang, Edmund M.; Virk, Sabitoj Singh; Underhill, Patrick T. (May 2022, Journal of Rheology)

   In this work, we analyzed an isotropic colloidal model incorporating both short-range sticky attractions and long-range electrostatic repulsions. We computed the zero-shear viscosity and second virial coefficient for a dilute colloidal suspension (i.e., pair interactions only) as a function of the strength of attractions and repulsions. We also developed an analytical approximation that allows us to better understand the coupling of the two types of interactions. The attractions and repulsions contribute to the zero-shear viscosity and second virial coefficient in different ways, leading to cases with the same second virial coefficient but different zero-shear viscosity. The analytical approximation shows that the mechanism of the coupling of interactions is that long-range repulsions can weaken the influence of short-range attractions. This effect alters how repulsions change the zero-shear viscosity. Acting independently, both attractions and repulsions increase the viscosity coefficient of the system. However, when both types of interactions are considered together, repulsions can screen the effect of attractive interactions, thereby reducing the viscosity. 

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2. Long-ranged spectral correlations in eigenstate phases

   https://doi.org/10.1088/1751-8121/ad1342  

   Prasad, Mahaveer; Prakash, Abhishodh; Pixley, J. H.; Kulkarni, Manas (December 2023, Journal of Physics A: Mathematical and Theoretical)

   Abstract We study non-local measures of spectral correlations and their utility in characterizing and distinguishing between the distinct eigenstate phases of quantum chaotic and many-body localized systems. We focus on two related quantities, the spectral form factor and the density of all spectral gaps, and show that they furnish unique signatures that can be used to sharply identify the two phases. We demonstrate this by numerically studying three one-dimensional quantum spin chain models with (i) quenched disorder, (ii) periodic drive (Floquet), and (iii) quasiperiodic detuning. We also clarify in what ways the signatures are universal and in what ways they are not. More generally, this thorough analysis is expected to play a useful role in classifying phases of disorder systems. 

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3. Disorder-Induced Long-Ranged Correlations in Scalar Active Matter

   https://doi.org/10.1103/PhysRevLett.126.048003  

   Ro, Sunghan; Kafri, Yariv; Kardar, Mehran; Tailleur, Julien (January 2021, Physical Review Letters)

   null (Ed.)
4. Topological origins of yielding in short-ranged weakly attractive colloidal gels

   https://doi.org/10.1063/5.0123096  

   Mangal, Deepak; Nabizadeh, Mohammad; Jamali, Safa (January 2023, The Journal of Chemical Physics)

   Yielding of the particulate network in colloidal gels under applied deformation is accompanied by various microstructural changes, including rearrangement, bond rupture, anisotropy, and reformation of secondary structures. While much work has been done to understand the physical underpinnings of yielding in colloidal gels, its topological origins remain poorly understood. Here, employing a series of tools from network science, we characterize the bonds using their orientation and network centrality. We find that bonds with higher centralities in the network are ruptured the most at all applied deformation rates. This suggests that a network analysis of the particulate structure can be used to predict the failure points in colloidal gels a priori. 

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5. Long-ranged velocity correlations in dense systems of self-propelled particles

   https://doi.org/10.1209/0295-5075/133/60002  

   Szamel, Grzegorz; Flenner, Elijah (March 2021, EPL (Europhysics Letters))

   null (Ed.)