NDLI: Signatures of bulk topology in the non-linear optical spectra of Dirac-Weyl materials

Content Provider	EDP Sciences
Author	Upendra Kumar Vipin Kumar Girish S. Setlur
Abstract	Graphene, topological insulators (TI) and the Weyl semimetal are shown to be well-characterized using the phenomenon of anomalous Rabi oscillation (ARO). These oscillations occur far from conventional resonance and Floquet theory shows them to be unique to these systems. Of particular interest is the bulk topological insulator (TI) where the wave-vector dependent frequency of the ARO is seen to be gapped in topologically trivial situations and gapless when there is a non-vanishing Chern number. It is shown that the Chern number may be directly inferred by performing a pump-probe experiment in the bulk without referring to surface states. A simpler alternative to the Lindblad method is invoked in order to incorporate dephasing effects that despite leading to a non-unitary time evolution of the wave-function, is nevertheless, probability conserving. The differential transmission coefficient versus the pump pulse duration (when all else is held fixed) has the form of a sinusoidal function with an amplitude that decays as a power law in the pump duration (alternatively, the “area” of the pump pulse). The exponent of this power law decay is indicative of the Chern number of the bulk in case of TI and more generally indicative of the particular member of the family of materials that may be collectively referred to as – Dirac-Weyl materials.
Starting Page	86
File Format	HTM / HTML
ISSN	14346028
e-ISSN	14346036
Issue Number	5
Journal	The European Physical Journal B
Volume Number	91
DOI	10.1140/epjb/e2018-80559-1
Alternate Webpage(s)	https://articles/epjb/abs/2018/05/b170559/b170559.html
Language	English
Publisher	EDP Sciences, Società Italiana di Fisica, Springer-Verlag
Publisher Date	2018-05-01
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2018
Subject Keyword	Solid State and Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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