Magnetic Circular Dichroism in Nanomaterials: New Opportunity in Understanding and Modulation of Excitonic and Plasmonic Resonances

Abstract

Figure 2. a) MCD spectra of In x Ga 1−x As quantum wells and b) scheme showing a negative left derivative MCD peak. c) Zeeman splitting of related transitions under different magnetic fields. d) Scheme of a positive left derivative MCD peak. The arrows in (c) and (d) show the allowed transitions. Reproduced with permission.

Highlighting spin selectivity properties of chiral electrode surfaces from redox potential modulation of an achiral probe under an applied magnetic field

“… 51 , 52 Although achiral chromophores are CD inactive, some of them yield increasingly sharp CD spectra under increasing magnetic field strength, specularly inverting the magnetic field orientation. 53 Notably, both ferrocyanide and ferrocene, involved in the redox couples considered in the present work, have been long known to give magnetic dichroism. 54 , 55 Also a very preliminary test on the temperature dependence of the spin-related potential splitting effect might be compared with magnetic CD features (Fig.…”

“…This statement is strongly supported by the observation that exactly the same feature has been found for circular dichroism, CD, spectra, which result from different absorption of the L- and R-circularly polarized light components by a chiral molecular probe, are specular according to the sample ( R )- or ( S )-configuration, and very sharp for inherently chiral chromophores 51,52. Although achiral chromophores are CD inactive, some of them yield increasingly sharp CD spectra under increasing magnetic field strength, specularly inverting the magnetic field orientation 53. Notably, both ferrocyanide and ferrocene, involved in the redox couples considered in the present work, have been long known to give magnetic dichroism 54,55.…”

van der Waals Magnets: Material Family, Detection and Modulation of Magnetism, and Perspective in Spintronics

“…As shown in the right panel of Figure 3d, at the temperature above T sr , MCD signal is nearly zero without field, but it presents a considerable value under out‐of‐plane field, indicating that the moments are intrinsically aligned in‐plane because MCD can only detect out‐of‐plane magnetization. [ 82 ] Then, the magnetization direction switches to out‐of‐plane with the decrease of temperature, which is verified by the large MCD intensity without field. [ 81 ] Hereafter, further studies are needed to clarify the magnetism of monolayer Fe 4 GeTe 2 .…”

Electromagnetic chirality: from fundamentals to nontraditional chiroptical phenomena

“…Not only absorptive and scattering phenomena but also optomechanical effects can be explained using this theoretical framework. Other chiroptical effects, such as the photothermal effect 167,168 , magnetic circular dichroism 169 , and nonlinear chirality 170,171 , could also be interpreted based on these same outlines. We expect this review to provide a clear understanding of the underlying theory of chiroptical systems and help guide research on and applications of chiroptical phenomena in a theoretically robust manner.…”