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Low-temperature transport in metals with strong dipole fluctuations

Determine how electron–electron interactions with energy scales U much smaller than ħω_g, together with significant dipole fluctuations characterized by the geometric length ℓ_g, modify electron dynamics near the Fermi surface; quantify these effects in transport and quantum oscillations, derive the mechanism of spectral-weight transfer to zero frequency, and identify how quantum geometry accelerates charge carriers.

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Background

While quantum-geometric effects are often discussed in insulators and flat bands, the authors highlight metals as a natural setting where dipole fluctuations can reshape expectations for transport and correlated instabilities near the Fermi surface.

Clarifying the interplay between interactions (U ≪ ħω_g) and geometric scales (ℓ_g, ω_g) could explain anomalous spectral-weight redistribution and apparent increases in carrier effective speed in both metals and correlated condensates.

References

That said, many fundamental questions remain open, and the full implications of quantum geometry in solid state physics are in its infancy. A key open challenge is understanding how interactions combined with significant dipole fluctuations affect the dynamics of electrons around the Fermi surface in metals. Can these effects be quantified through electronic transport at the Fermi surface, such as in its quantum oscillations? How can interactions with energies substantially smaller than the geometric energy U \ll \hbar\omega_g lead to the transfer of spectral weight to zero frequencies, enhancing charge transport, both in metals and correlated condensates? What is the mechanism by which geometry "speeds up" charge carriers in quantum matter?

Quantum Geometry: Revisiting electronic scales in quantum matter (2504.07173 - Verma et al., 9 Apr 2025) in Discussion and Outlook, “Low temperature phenomena” paragraph