Condensed Matter Theory: publications

Natural protein structures have evolved exceptional robustness to mutations

Authors:

SHA von der Dunk, K Dingle, AA Louis, B Snel, P Hogeweg

Nature of active forces in tissues: how contractile cells can form extensile monolayers

Authors:

Lakshmi Balasubramaniam, Amin Doostmohammadi, Thuan Beng Saw, Gautham Hari Narayana Sankara Narayana, Romain Mueller, Tien Dang, Minnah Thomas, Shafali Gupta, Surabhi Sonam, Alpha S Yap, Yusuke Toyama, René-Marc Mège, Julia Yeomans, Benoît Ladoux

New horizons for inhomogeneous quenches and Floquet CFT

arXiv:2404.07884

Authors:

Hanzhi Jiang, Márk Mezei

Abstract:

A fruitful avenue in investigating out-of-equilibrium quantum many-body systems is to abruptly change their Hamiltonian and study the subsequent evolution of their quantum state. If this is done once, the setup is called a quench, while if it is done periodically, it is called Floquet driving. We consider the solvable setup of a two-dimensional CFT driven by Hamiltonians built out of conformal symmetry generators: in this case, the quantum dynamics can be understood using two-dimensional geometry. We investigate how the dynamics is reflected in the holographic dual three-dimensional spacetime and find new horizons. We argue that bulk operators behind the new horizons are reconstructable by virtue of modular flow.

Non-Poissonian bursts in the arrival of phenotypic variation can strongly affect the dynamics of adaptation

Authors:

Nora S Martin, Steffen Schaper, Chico Q Camargo, Ard A Louis

Odd Fracton Theories, Proximate Orders, and Parton Constructions

Physical Review B: Condensed Matter and Materials Physics American Physical Society

Authors:

Michael Pretko, Sa Parameswaran, Michael Hermele

Abstract:

The Lieb-Schultz-Mattis (LSM) theorem implies that gapped phases of matter must satisfy non-trivial conditions on their low-energy properties when a combination of lattice translation and $U(1)$ symmetry are imposed. We describe a framework to characterize the action of symmetry on fractons and other sub-dimensional fractional excitations, and use this together with the LSM theorem to establish that X-cube fracton order can occur only at integer or half-odd-integer filling. Using explicit parton constructions, we demonstrate that "odd" versions of X-cube fracton order can occur in systems at half-odd-integer filling, generalizing the notion of odd $Z_2$ gauge theory to the fracton setting. At half-odd-integer filling, exiting the X-cube phase by condensing fractional quasiparticles leads to symmetry-breaking, thereby allowing us to identify a class of conventional ordered phases proximate to phases with fracton order. We leverage a dual description of one of these ordered phases to show that its topological defects naturally have restricted mobility. Condensing pairs of these defects then leads to a fracton phase, whose excitations inherit these mobility restrictions.

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