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Dynamically Induced Excitonic Instability in Pumped Dirac Materials
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Connecticut, USA.
Number of Authors: 22020 (English)In: Annalen der Physik, ISSN 0003-3804, E-ISSN 1521-3889, Vol. 532, no 2, article id 1900549Article, review/survey (Refereed) Published
Abstract [en]

Driven and non-equilibrium quantum states of matter have attracted growing interest in both theoretical and experimental studies in condensed matter physics. Recent progress in realizing transient collective states in driven or pumped Dirac materials (DMs) is reviewed herein. In particular, the focus is on optically pumped DMs which are a promising platform for transient excitonic instabilities. Optical pumping combined with the linear (Dirac) dispersion of the electronic spectrum offers a knob for tuning the effective interaction between the photoexcited electrons and holes, and thus provides a way of reducing the critical coupling for excitonic instability. As a result, a transient excitonic condensate could be achieved in a pumped DM while it is not feasible in equilibrium. A unifying theoretical framework is provided for describing transient collective states in 2D and 3D DMs. The experimental signatures are described and numerical estimates of the size of the dynamically induced excitonic gaps and the values of the critical temperatures for several specific systems, are summarized. In addition, general guidelines for identifying promising material candidates are discussed. Finally, comments are provided regarding recent experimental efforts in realizing transient excitonic condensate in pumped DMs, and outstanding issues and possible future directions are outlined.

Place, publisher, year, edition, pages
2020. Vol. 532, no 2, article id 1900549
Keywords [en]
dirac materials, excitonic insulator, optical pumping
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-179595DOI: 10.1002/andp.201900549ISI: 000509748600001OAI: oai:DiVA.org:su-179595DiVA, id: diva2:1416277
Available from: 2020-03-23 Created: 2020-03-23 Last updated: 2020-03-23Bibliographically approved

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