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Início
Agenda
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- 22 de agosto de 2018
16h30
Sala
18 (Cristalografia) -
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Rajesh
Narayanan
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Department of
Physics Indian Institute of Technology Madras, Índia
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Emergent
Random Fields in Frustrated Magnets
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A host of examples in modern condensed matter has
low temperature ground states that breaks not only symmetries
such as spin or phase or gauge symmetries but also real space
lattice symmetries. Salient examples are the stripe phase in
superconductors or the Ising nematic state in pnictides. In this
talk we investigate the effect of quenched disorder on
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such ground states which break real space symmetry.
By means of utilizing a simple generalisation of the Ising model
we show that disorder (uncorrelated) is inimical to such real
space broken ground states, leading to its destruction via an
emergent random field mechanism. We further show that the
strength of the random field can be tuned to zero via building
anticorrelations in the distribution of impurity atoms. This
thus protects the ground states with broken translational
symmetry.
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