Roderich Moessner
Max Planck Society
Quantum spin liquidMagnetic fieldPhysicsTopologyLattice (order)Magnetic monopoleAntiferromagnetismHamiltonian (quantum mechanics)Gauge theorySpin iceCondensed matter physicsSpinsPyrochloreTheoretical physicsIsing modelFermionQuantum mechanicsGround stateQuantumCoulomb
Publications 425
The Heisenberg antiferromagnet on the kagome lattice is an archetypal instance of how large ground state degeneracies arise, and how they may get resolved by thermal and quantum fluctuations. Augmenting the Heisenberg model by chiral spin interactions has proved to be of particular interest in the discovery of certain chiral quantum spin liquids. Here we consider the classical variant of this chiral kagome model and find that it exhibits, similar to the classical Heisenberg antiferromagnet, a re...
#4Inti Sodemann (MPG: Max Planck Society)H-Index: 2
Nonuniform elastic strain is known to induce pseudo-Landau levels in Dirac materials. But these pseudo-Landau levels are hardly resolvable in an analytic fashion when the strain is strong, because of the emerging complicated space dependence in both the strain-modulated Fermi velocity and the strain-induced pseudomagnetic field. We analytically characterize the solution to the pseudo-Landau levels in experimentally accessible strongly bent graphene nanoribbons, by treating the effects of the non...
#1Sambuddha SanyalH-Index: 9
#2Kedar DamleH-Index: 23
Last. Roderich MoessnerH-Index: 73
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We exhibit an exactly solvable example of a SU(2) symmetric Majorana spin liquid phase, in which quenched disorder leads to random-singlet phenomenology. More precisely, we argue that a strong-disorder fixed point controls the low temperature susceptibility \chi(T)of an exactly solvable S=1/2model on the decorated honeycomb lattice with quenched bond disorder and/or vacancies, leading to \chi(T) = {\mathcal C}/T+ {\mathcal D} T^{\alpha(T) - 1}where \alpha(T) \rightarrow 0as $T \right...
#1Salvatore D. Pace (University of Cambridge)H-Index: 2
#2Siddhardh C. Morampudi (MIT: Massachusetts Institute of Technology)H-Index: 7
Last. Chris Laumann (BU: Boston University)H-Index: 24
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#2Claudio Castelnovo (University of Cambridge)H-Index: 22
Last. Sarang GopalakrishnanH-Index: 35
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We consider quantum spin ice in a temperature regime in which its response is dominated by the coherent motion of a dilute gas of monopoles. The hopping amplitude of a monopole is sensitive to the configuration of its surrounding spins, taken to be quasi-static on the relevant timescales. This leads to well-known blocked directions in the monopole motion; we find that these are sufficient to reduce the coherent propagation of monopoles to quantum diffusion. This result is robust against disorder...
Coulomb spin liquids are topological magnetic states obeying an emergent Gauss' law. Little distinction has been made between different kinds of Coulomb liquids. Here we show how a series of distinct Coulomb liquids can be generated straightforwardly by varying the constraints on a classical spin system. This leads to pair creation/annihilation, and coalescence, of topological defects of an underlying vector field. The latter makes higher-rank spin liquids, of recent interest in the context of f...
The Letter by N. Y. Yao et. al. [1,2] presents three models for realizing a many-body localized discrete time-crystal (MBL DTC): a short-ranged model [1], its revised version [2], as well as a long-range model of a trapped ion experiment [1,3]. We show that none of these realize an MBL DTC for the parameter ranges quoted in Refs. [1,2]. The central phase diagrams in [1] therefore cannot be reproduced. The models show rapid decay of oscillations from generic initial states, in sharp contrast to t...
The search for departures from standard hydrodynamics in many-body systems has yielded a number of promising leads, especially in low dimension. Here we study one of the simplest classical interacting lattice models, the nearest-neighbour Heisenberg chain, with temperature as tuning parameter. Our numerics expose strikingly different spin dynamics between the antiferromagnet, where it is largely diffusive, and the ferromagnet, where we observe strong evidence either of spin super-diffusion or an...
#1Song-Bo Zhang (University of Würzburg)H-Index: 11
#2Chang-An Li (University of Würzburg)H-Index: 6
Last. Björn Trauzettel (University of Würzburg)H-Index: 30
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Magnetic oscillations of Dirac surface states of topological insulators are expected to be associated with the formation of Landau levels or the Aharonov-Bohm effect. We instead study the conductance of Dirac surface states subjected to an in-plane magnetic field in presence of a barrier potential. Strikingly, we find that, in the case of large barrier potentials, the surface states exhibit pronounced oscillations in the conductance when varying the magnetic field, in the \textit{absence} of Lan...
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