Hidden Quantum State and Signature of Mott Transition in Two-dimensional 1T-TaS2
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| Format: | Preprint |
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2025
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| _version_ | 1866908350501879808 |
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| author | Kumar, Vivek Singh, Birender Kumar, Pradeep |
| author_facet | Kumar, Vivek Singh, Birender Kumar, Pradeep |
| contents | Here we report a comprehensive inelastic light scattering studies on 1T-TaS2 with different thickness. This compound is well known for its rich charge density wave phases. Along with that it has been one of the promising candidates for a quantum spin liquid state as the spins reside on a triangular lattice and it does not show any signature of magnetic ordering. We performed a thickness dependent Raman measurement in a regime of completely commensurate charge density wave (C-CDW) to a nearly commensurate charge density wave (NC-CDW) with varying temperature (4K-330K) and polarization direction of the incident light. We observed the signature of CDW transition and in addition to that we have also found the signature of a well sought hidden quantum CDW state at low temperature around TH ~ 80K. The emergence of CDW, both normal and hidden one, is marked by the emergence of new phonon modes and distinct renormalized phonon self-energy parameters for the most prominent modes. A transition from metallic to the Mott insulating state is gauged via the Raman response using low frequency slope , reflected in the renormalized slope below TCDW and TH. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_02545 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hidden Quantum State and Signature of Mott Transition in Two-dimensional 1T-TaS2 Kumar, Vivek Singh, Birender Kumar, Pradeep Strongly Correlated Electrons Here we report a comprehensive inelastic light scattering studies on 1T-TaS2 with different thickness. This compound is well known for its rich charge density wave phases. Along with that it has been one of the promising candidates for a quantum spin liquid state as the spins reside on a triangular lattice and it does not show any signature of magnetic ordering. We performed a thickness dependent Raman measurement in a regime of completely commensurate charge density wave (C-CDW) to a nearly commensurate charge density wave (NC-CDW) with varying temperature (4K-330K) and polarization direction of the incident light. We observed the signature of CDW transition and in addition to that we have also found the signature of a well sought hidden quantum CDW state at low temperature around TH ~ 80K. The emergence of CDW, both normal and hidden one, is marked by the emergence of new phonon modes and distinct renormalized phonon self-energy parameters for the most prominent modes. A transition from metallic to the Mott insulating state is gauged via the Raman response using low frequency slope , reflected in the renormalized slope below TCDW and TH. |
| title | Hidden Quantum State and Signature of Mott Transition in Two-dimensional 1T-TaS2 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.02545 |