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

Shoufeng Lan; Xiang Zhang

doi:10.1117/12.2510148

4 March 2019 The interplay of magnetism and chirality in van der Waals crystals (Conference Presentation)

Shoufeng Lan, Xiang Zhang

Proceedings Volume 10927, Photonic and Phononic Properties of Engineered Nanostructures IX; 1092708 (2019) https://doi.org/10.1117/12.2510148
Event: SPIE OPTO, 2019, San Francisco, California, United States

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.

Conference Presentation

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Shoufeng Lan and Xiang Zhang "The interplay of magnetism and chirality in van der Waals crystals (Conference Presentation)", Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 1092708 (4 March 2019); https://doi.org/10.1117/12.2510148

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KEYWORDS

Magnetism

Crystals

Dichroic materials

Anisotropy

Metamaterials

Molecules

Organisms

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