Spontaneous gyrotropic electronic order in a transition-metal dichalcogenide
Author(s)Xu, Suyang; Ma, Qiong; Gao, Yang; Kogar, Anshul; Zong, Guo; Mier Valdivia, Andrés M.; Dinh, Thao H.; Huang, Shin-Ming; Singh, Bahadur; Hsu, Chuang-Han; Chang, Tay-Rong; Ruff, Jacob P. C.; Watanabe, Kenji; Taniguchi, Takashi; Lin, Hsin; Karapetrov, Goran; Xiao, Di; Jarillo-Herrero, Pablo; Gedik, Nuh; ... Show more Show less
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Chirality is ubiquitous in nature, and populations of opposite chiralities are surprisingly asymmetric at fundamental levels. Examples range from parity violation in the subatomic weak force to homochirality in biomolecules. The ability to achieve chirality-selective synthesis (chiral induction) is of great importance in stereochemistry, molecular biology and pharmacology. In condensed matter physics, a crystalline electronic system is geometrically chiral when it lacks mirror planes, space-inversion centres or rotoinversion axes. Typically, geometrical chirality is predefined by the chiral lattice structure of a material, which is fixed on formation of the crystal. By contrast, in materials with gyrotropic order electrons spontaneously organize themselves to exhibit macroscopic chirality in an originally achiral lattice. Although such order—which has been proposed as the quantum analogue of cholesteric liquid crystals—has attracted considerable interest no clear observation or manipulation of gyrotropic order has been achieved so far. Here we report the realization of optical chiral induction and the observation of a gyrotropically ordered phase in the transition-metal dichalcogenide semimetal 1T-TiSe₂. We show that shining mid-infrared circularly polarized light on 1T-TiSe₂ while cooling it below the critical temperature leads to the preferential formation of one chiral domain. The chirality of this state is confirmed by the measurement of an out-of-plane circular photogalvanic current, the direction of which depends on the optical induction. Although the role of domain walls requires further investigation with local probes, the methodology demonstrated here can be applied to realize and control chiral electronic phases in other quantum materials.
DepartmentMassachusetts Institute of Technology. Department of Physics
Springer Science and Business Media LLC
Xu, Su-Yang et al. "Spontaneous gyrotropic electronic order in a transition-metal dichalcogenide." Nature 578, 7796 (February 2020): 545–549 © 2020 The Author(s)
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