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arXiv · 2207.11622

Unconventional Charge-density-wave Order in a Dilute d-band Semiconductor

Huandong Chen·Batyr Ilyas·Boyang Zhao·Emre Ergecen·Josh Mutch·Gwan Yeong Jung·Qian Song·Connor A. Occhialini·Guodong Ren·Sara Shabani·Eric Seewald·Shanyuan Niu·Jiangbin Wu·Nan Wang·Mythili Surendran·Shantanu Singh·Jiang Luo·Sanae Ohtomo·Gemma Goh·Bryan C. Chakoumakos·Simon J. Teat·Brent Melot·Han Wang·Di Xiao·Abhay N. Pasupathy·Riccardo Comin·Rohan Mishra·Jiun-Haw Chu·Nuh Gedik·Jayakanth Ravichandran
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Abstract

Electron-lattice coupling effects in low dimensional materials give rise to charge density wave (CDW) order and phase transitions. These phenomena are critical ingredients for superconductivity and predominantly occur in metallic model systems such as doped cuprates, transition metal dichalcogenides, and more recently, in Kagome lattice materials. However, CDW in semiconducting systems, specifically at the limit of low carrier concentration region, is uncommon. Here, we combine electrical transport, synchrotron X-ray diffraction and optical spectroscopy to discover CDW order in a quasi-one-dimensional (1D), dilute d-band semiconductor, BaTiS3, which suggests the existence of strong electron-phonon coupling. The CDW state further undergoes an unusual transition featuring a sharp increase in carrier mobility. Our work establishes BaTiS3 as a unique platform to study the CDW physics in the dilute filling limit to explore novel electronic phases.

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Huandong Chen, Batyr Ilyas, Boyang Zhao, Emre Ergecen, Josh Mutch, Gwan Yeong Jung, Qian Song, Connor A. Occhialini, Guodong Ren, Sara Shabani, Eric Seewald, Shanyuan Niu, Jiangbin Wu, Nan Wang, Mythili Surendran, Shantanu Singh, Jiang Luo, Sanae Ohtomo, Gemma Goh, Bryan C. Chakoumakos, Simon J. Teat, Brent Melot, Han Wang, Di Xiao, Abhay N. Pasupathy, Riccardo Comin, Rohan Mishra, Jiun-Haw Chu, Nuh Gedik, Jayakanth Ravichandran. 2022-07-23. Unconventional Charge-density-wave Order in a Dilute d-band Semiconductor. https://doi.org/10.1002/adma.202303283

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