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Proceedings Paper

The interplay of magnetism and chirality in van der Waals crystals (Conference Presentation)

Paper Abstract

One of the most fundamental mysteries is the homochirality of living organisms on the Earth. Scientists have spent endless efforts in understanding the origin of the enantiomeric excess, in which a magneto-chiral effect is believed to play a role. However, this magneto-chiral effect observed so far is very weak in diamagnetic bulk crystals under a strong magnetic field, synthetic chiral molecules with magnetic components in solutions, or thin-film chiral magnets and metamaterials. Recently, atomically flat two-dimensional materials have emerged with intriguing properties such as optical anisotropy, two-dimensional ferromagnetism, and valley pseudospins. Here, we report the observation of giant magneto-chiral dichroism in atomically thin van der Waals crystals. We found such giant magneto-chiral dichroism originated from two unique physical processes. The parity-inversion symmetry breaking induces a large chirality, and time-reversal symmetry breaking results in strong magnetic moments. Such an approach offers rich physics with the interplay of the magnetism, chirality, and valley pseudospins in a unified manner. The observed giant magneto-chiral effect may further our understanding of the enantiomeric excess that is important for photochemical reactions, asymmetric synthesizes, and drug delivery.

Paper Details

Date Published: 4 March 2019
Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 1092708 (4 March 2019); doi: 10.1117/12.2510148
Show Author Affiliations
Shoufeng Lan, Univ. of California, Berkeley (United States)
Xiang Zhang, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 10927:
Photonic and Phononic Properties of Engineered Nanostructures IX
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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