Polymorphic Spin, Charge, and Lattice Waves in Vanadium Ditelluride

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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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.

Original languageEnglish
Article number1906578
JournalAdvanced Materials
Volume32
Issue number11
DOIs
StatePublished - Mar 1 2020
Externally publishedYes

Funding

D.W. and D.H.K. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) under Grant No. NRF‐2018M3D1A1058793 and NRF‐2018M3D1A1058754. J.‐G.P. at IBS‐CCES acknowledges the support from the Institute for Basic Science (IBS) in Korea (Grant No. IBS‐R009‐G1). M.J.H. was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2018R1A2B2005204). H.Y. acknowledges support from the National Research Foundation of Korea (NRF) under Grant No. NRF‐2020R1A2B5B02002548. S.C. acknowledges support from the National Research Foundation of Korea (NRF) under Grant No. 2019K1A3A7A09094862. D.W. and D.H.K. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) under Grant No. NRF-2018M3D1A1058793 and NRF-2018M3D1A1058754. J.-G.P. at IBS-CCES acknowledges the support from the Institute for Basic Science (IBS) in Korea (Grant No. IBS-R009-G1). M.J.H. was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2018R1A2B2005204). H.Y. acknowledges support from the National Research Foundation of Korea (NRF) under Grant No. NRF-2020R1A2B5B02002548. S.C. acknowledges support from the National Research Foundation of Korea (NRF) under Grant No. 2019K1A3A7A09094862.

Keywords

  • charge density waves
  • polymorphism
  • transition metal dichalcogenides
  • vanadium ditelluride

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