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Peer-reviewedCC BYNano letters

Dynamics of Charge-Density-Wave Puddles in 2H-NbSe2.

  • Shreya Kumbhakar1,2
  • Marina Esposito2,3
  • Anjan Kumar N M1
  • Liwen Feng1
  • Tommaso Confalone2,4
  • Vasilisa Gerega2,4
  • Flavia Lo Sardo2,5
  • Rafiqul Alam2
  • Davide Masarotti6
  • Francesco Tafuri3
  • Thomas Böhm2
  • Mahmoud Abdel-Hafiez7
6 more authors
  • Sushmita Chandra8
  • Claudia Felser8
  • Kornelius Nielsch2,5
  • Nicola Poccia2,3
  • Stefan Kaiser1
  • Golam Haider2
8 affiliations
  1. 1Institute of Solid State and Materials Physics, TUD Dresden University of Technology, DresdenD-01062, Germany.
  2. 2Leibniz Institute for Solid State and Materials Research, Helmholtzstr. 20, DresdenD-01069, Germany.
  3. 3Department of Physics, University of Naples Federico II, NaplesI-80126, Italy.
  4. 4Institute of Applied Physics, TUD Dresden University of Technology, DresdenD-01062, Germany.
  5. 5Institute of Materials Science, TUD Dresden University of Technology, DresdenD-01062, Germany.
  6. 6Department of Electrical Engineering and Information Technology, University of Naples Federico II, NaplesI-80126, Italy.
  7. 7Department of Applied Physics and Astronomy, University of Sharjah, 27272Sharjah, United Arab Emirates.
  8. 8Max Planck Institute for Chemical Physics of Solids, DresdenD-01187, Germany.
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Abstract

Electronic phases in quantum materials are often governed by nanoscale inhomogeneity, where local order develops within spatially confined regions, or puddles. A prominent example is an incommensurate charge-density-wave (I-CDW) comprising locally commensurate domains. In 2H-NbSe2, such an I-CDW state persists alongside lattice anharmonicity and superconductivity, raising fundamental questions about the dynamical stabilization of CDW order in puddles. Here, using Raman scattering, we reveal a strong Fano-coupling between interlayer shear phonons and the CDW amplitude mode. Our time-resolved reflectivity measurement shows a low-frequency ∼0.2 THz coherent overdamped oscillation onsetting within the CDW regime at ∼17K, indicating a previously unexplored transition. This we identify as a Fano-coupled phonon-CDW hybrid emerging from the collective dynamics of CDW puddles. We establish an overdamped-oscillator framework for capturing such intertwined glassy dynamics. These results highlight how lattice pinning and electronic correlations shape CDW order in layered materials, insight crucial for designing novel van der Waals devices.

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Cite

BibTeXRIS
BibTeX
@article{kumbhakar2026dynamics,
  title = {{Dynamics of Charge-Density-Wave Puddles in 2H-NbSe2.}},
  author = {Shreya Kumbhakar and Marina Esposito and Anjan Kumar N M and Liwen Feng and Tommaso Confalone and Vasilisa Gerega and Flavia Lo Sardo and Rafiqul Alam and Davide Masarotti and Francesco Tafuri and Thomas Böhm and Mahmoud Abdel-Hafiez and Sushmita Chandra and Claudia Felser and Kornelius Nielsch and Nicola Poccia and Stefan Kaiser and Golam Haider},
  journal = {Nano letters},
  year = {2026},
  month = oct,
  doi = {10.1021/acs.nanolett.6c03967},
  url = {https://europepmc.org/article/MED/42905087},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Dynamics of Charge-Density-Wave Puddles in 2H-NbSe2.
AU  - Shreya Kumbhakar
AU  - Marina Esposito
AU  - Anjan Kumar N M
AU  - Liwen Feng
AU  - Tommaso Confalone
AU  - Vasilisa Gerega
AU  - Flavia Lo Sardo
AU  - Rafiqul Alam
AU  - Davide Masarotti
AU  - Francesco Tafuri
AU  - Thomas Böhm
AU  - Mahmoud Abdel-Hafiez
AU  - Sushmita Chandra
AU  - Claudia Felser
AU  - Kornelius Nielsch
AU  - Nicola Poccia
AU  - Stefan Kaiser
AU  - Golam Haider
PY  - 2026
DA  - 2026/10/01
JO  - Nano letters
DO  - 10.1021/acs.nanolett.6c03967
UR  - https://europepmc.org/article/MED/42905087
AB  - Electronic phases in quantum materials are often governed by nanoscale inhomogeneity, where local order develops within spatially confined regions, or puddles. A prominent example is an incommensurate charge-density-wave (I-CDW) comprising locally commensurate domains. In 2H-NbSe2, such an I-CDW state persists alongside lattice anharmonicity and superconductivity, raising fundamental questions about the dynamical stabilization of CDW order in puddles. Here, using Raman scattering, we reveal a strong Fano-coupling between interlayer shear phonons and the CDW amplitude mode. Our time-resolved reflectivity measurement shows a low-frequency ∼0.2 THz coherent overdamped oscillation onsetting within the CDW regime at ∼17K, indicating a previously unexplored transition. This we identify as a Fano-coupled phonon-CDW hybrid emerging from the collective dynamics of CDW puddles. We establish an overdamped-oscillator framework for capturing such intertwined glassy dynamics. These results highlight how lattice pinning and electronic correlations shape CDW order in layered materials, insight crucial for designing novel van der Waals devices.
SN  - 1530-6984
SN  - 1530-6992
ER  -