Origin of chirality in transition-metal dichalcogenides
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916827313995776 |
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| author | Kim, Kwangrae Kim, Hyun-Woo J. Ha, Seunghyeok Kim, Hoon Kim, Jin-Kwang Kim, Jaehwon Kim, Hyunsung Kwon, Junyoung Seol, Jihoon Jung, Saegyeol Kim, Changyoung Alatas, Ahmet Said, Ayman Merz, Michael Tacon, Matthieu Le Bok, Jin Mo Kim, Ki-Seok Kim, B. J. |
| author_facet | Kim, Kwangrae Kim, Hyun-Woo J. Ha, Seunghyeok Kim, Hoon Kim, Jin-Kwang Kim, Jaehwon Kim, Hyunsung Kwon, Junyoung Seol, Jihoon Jung, Saegyeol Kim, Changyoung Alatas, Ahmet Said, Ayman Merz, Michael Tacon, Matthieu Le Bok, Jin Mo Kim, Ki-Seok Kim, B. J. |
| contents | Chirality is a ubiquitous phenomenon in which a symmetry between left- and right-handed objects is broken, examples in nature ranging from subatomic particles and molecules to living organisms. In particle physics, the weak force is responsible for the symmetry breaking and parity violation in beta decay, but in condensed matter systems interactions that lead to chirality remain poorly understood. Here, we unravel the mechanism of chiral charge density wave formation in the transition-metal dichalcogenide 1T-TiSe2. Using representation analysis, we show that charge density modulations and ionic displacements, which transform as a continuous scalar field and a vector field on a discrete lattice, respectively, follow different irreducible representations of the space group, despite the fact that they propagate with the same wave-vectors and are strongly coupled to each other. This charge-lattice symmetry frustration is resolved by further breaking of all symmetries not common to both sectors through induced lattice distortions, thus leading to chirality. Our theory is verified using Raman spectroscopy and inelastic x-ray scattering, which reveal that all but translation symmetries are broken at a level not resolved by state-of-the-art diffraction techniques. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_11979 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Origin of chirality in transition-metal dichalcogenides Kim, Kwangrae Kim, Hyun-Woo J. Ha, Seunghyeok Kim, Hoon Kim, Jin-Kwang Kim, Jaehwon Kim, Hyunsung Kwon, Junyoung Seol, Jihoon Jung, Saegyeol Kim, Changyoung Alatas, Ahmet Said, Ayman Merz, Michael Tacon, Matthieu Le Bok, Jin Mo Kim, Ki-Seok Kim, B. J. Strongly Correlated Electrons Chirality is a ubiquitous phenomenon in which a symmetry between left- and right-handed objects is broken, examples in nature ranging from subatomic particles and molecules to living organisms. In particle physics, the weak force is responsible for the symmetry breaking and parity violation in beta decay, but in condensed matter systems interactions that lead to chirality remain poorly understood. Here, we unravel the mechanism of chiral charge density wave formation in the transition-metal dichalcogenide 1T-TiSe2. Using representation analysis, we show that charge density modulations and ionic displacements, which transform as a continuous scalar field and a vector field on a discrete lattice, respectively, follow different irreducible representations of the space group, despite the fact that they propagate with the same wave-vectors and are strongly coupled to each other. This charge-lattice symmetry frustration is resolved by further breaking of all symmetries not common to both sectors through induced lattice distortions, thus leading to chirality. Our theory is verified using Raman spectroscopy and inelastic x-ray scattering, which reveal that all but translation symmetries are broken at a level not resolved by state-of-the-art diffraction techniques. |
| title | Origin of chirality in transition-metal dichalcogenides |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2312.11979 |