In-plane and out-of-plane electric dipoles and phase transitions in 2D-layered TlGaS2
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910065900912640 |
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| author | Molchanova, A. D. Yin, L. H. Gao, L. P. Song, W. H. Sun, Y. P. Allahverdiyev, K. R. Popova, M. N. |
| author_facet | Molchanova, A. D. Yin, L. H. Gao, L. P. Song, W. H. Sun, Y. P. Allahverdiyev, K. R. Popova, M. N. |
| contents | Out-of-plane and in-plane electric polarization, which rarely coexist in a two-dimensional (2D) ferroelectric material, offer different advantages in ferroelectricity-based devices. Here, we report the coexistence of in-plane and out-of-plane electric dipoles, along with various phase transitions, in 2D van der Waals layered TlGaS2 single crystal. Quantum paraelectricity was observed along both in-plane and out-of-plane directions of the TlGaS2 crystal. Detailed investigation of the quantum paraelectric soft-mode behavior reveals a close correlation between the electric dipoles and the off-center displacement of Tl1+ ions with 6s2 lone pairs in TlGaS2. Anomalies near temperatures of about 120 K and 60-75 K in dielectric and/or infrared spectra indicate the existence of local or weak long-range structural transitions in TlGaS2. Our results provide important experimental evidence for elucidating the phase transitions and coexistence of in-plane and out-of-plane electric dipoles in 2D layered TlGaS2. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_21994 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | In-plane and out-of-plane electric dipoles and phase transitions in 2D-layered TlGaS2 Molchanova, A. D. Yin, L. H. Gao, L. P. Song, W. H. Sun, Y. P. Allahverdiyev, K. R. Popova, M. N. Materials Science Mesoscale and Nanoscale Physics Out-of-plane and in-plane electric polarization, which rarely coexist in a two-dimensional (2D) ferroelectric material, offer different advantages in ferroelectricity-based devices. Here, we report the coexistence of in-plane and out-of-plane electric dipoles, along with various phase transitions, in 2D van der Waals layered TlGaS2 single crystal. Quantum paraelectricity was observed along both in-plane and out-of-plane directions of the TlGaS2 crystal. Detailed investigation of the quantum paraelectric soft-mode behavior reveals a close correlation between the electric dipoles and the off-center displacement of Tl1+ ions with 6s2 lone pairs in TlGaS2. Anomalies near temperatures of about 120 K and 60-75 K in dielectric and/or infrared spectra indicate the existence of local or weak long-range structural transitions in TlGaS2. Our results provide important experimental evidence for elucidating the phase transitions and coexistence of in-plane and out-of-plane electric dipoles in 2D layered TlGaS2. |
| title | In-plane and out-of-plane electric dipoles and phase transitions in 2D-layered TlGaS2 |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2603.21994 |