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Theory of collective magnetophonon resonance and melting of a field-induced Wigner solid
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Université Paris-Saclay, France.
Number of Authors: 42019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 8, article id 085140Article in journal (Refereed) Published
Abstract [en]

Electron solid phases of matter are revealed by characteristic vibrational resonances. Sufficiently large magnetic fields can overcome the effects of disorder, leading to a weakly pinned collective mode called the magnetophonon. Consequently, in this regime it is possible to develop a tightly constrained hydrodynamic theory of pinned magnetophonons. The behavior of the magnetophonon resonance across thermal and quantum melting transitions has been experimentally characterized in two-dimensional electron systems. Applying our theory to these transitions we explain several key features of the data. Firstly, violation of the Fukuyama-Lee sum rule as the transition is approached is shown to be a consequence of the non-Lorentzian form taken by the resonance. Secondly, this non-Lorentzian shape is shown to be caused by dissipative channels that become especially important close to melting: proliferating dislocations and uncondensed charge carriers.

Place, publisher, year, edition, pages
2019. Vol. 100, no 8, article id 085140
National Category
Materials Engineering Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-173109DOI: 10.1103/PhysRevB.100.085140ISI: 000482582200007OAI: oai:DiVA.org:su-173109DiVA, id: diva2:1357714
Available from: 2019-10-04 Created: 2019-10-04 Last updated: 2019-10-04Bibliographically approved

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Goutéraux, BlaiseKarlsson, Anna
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