Polymorphic Spin,Charge, and Lattice Waves in Vanadium Ditelluride |
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Authors: | Dongyeun Won Do Hoon Kiem Hwanbeom Cho Dohyun Kim Younghak Kim Min Yong Jeong Changwon Seo Jeongyong Kim Je-Geun Park Myung Joon Han Heejun Yang Suyeon Cho |
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Affiliation: | 1. Department of Energy Science, Sungkyunkwan University, Suwon, 16419 Korea;2. Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, 34141 Korea;3. Department of Physics and Astronomy, Seoul National University, Seoul, 08826 Korea
Center for Correlated Electron Systems, Institute for Basic Science, Seoul, 08826 Korea;4. Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 37673 Korea;5. Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul, 03760 Korea |
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Abstract: | Lattice distortion, spin interaction, and dimensional crossover in transition metal dichalcogenides (TMDs) have led to intriguing quantum phases such as charge density waves (CDWs) and 2D magnetism. However, the combined effect of many factors in TMDs, such as spin–orbit, electron–phonon, and electron–electron interactions, stabilizes a single quantum phase at a given temperature and pressure, which restricts original device operations with various quantum phases. Here, nontrivial polymorphic quantum states, CDW phases, are reported in vanadium ditelluride (VTe2) at room temperature, which is unique among various CDW systems; the doping concentration determines the formation of either of the two CDW phases in VTe2 at ambient conditions. The two CDW polymorphs show different antiferromagnetic spin orderings in which the vanadium atoms create two different stripe-patterned spin waves. First-principles calculations demonstrate that the magnetic ordering is critically coupled with the corresponding CDW in VTe2, which suggests a rich phase diagram with polymorphic spin, charge, and lattice waves all coexisting in a solid for new conceptual quantum state-switching device applications. |
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Keywords: | charge density waves polymorphism transition metal dichalcogenides vanadium ditelluride |
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