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Ultrafast dynamical Lifshitz transition.

Samuel Beaulieu1, Shuo Dong2, Nicolas Tancogne-Dejean3

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Scientists demonstrate an ultrafast Lifshitz transition in Td-MoTe2 by dynamically altering electronic correlations. This nonequilibrium method offers a new way to control Fermi surface topology in quantum materials.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Materials Chemistry

Background:

  • The Fermi surface topology dictates the electronic properties of metals and correlated systems.
  • Lifshitz transitions, abrupt changes in Fermi surface topology, are linked to phenomena like superconductivity and colossal magnetoresistance.
  • Previous Lifshitz transitions were achieved through equilibrium methods (strain, doping, pressure, temperature).

Purpose of the Study:

  • To experimentally demonstrate a nonequilibrium, dynamical route for ultrafast modification of Fermi surface topology.
  • To investigate the underlying mechanism of such a transition in a correlated material.

Main Methods:

  • Utilizing time-resolved multidimensional photoemission spectroscopy.
  • Employing state-of-the-art time-dependent density-functional theory with the Hubbard U (TDDFT+U) method for simulations.
  • Studying the correlated type-II Weyl semimetal Td-MoTe2.

Main Results:

  • Successfully induced an ultrafast Lifshitz transition in Td-MoTe2.
  • Established that the transition originates from the dynamical modification of effective electronic correlations.
  • Showcased a nonequilibrium topological electronic transition.

Conclusions:

  • Introduced a novel scheme for driving ultrafast Lifshitz transitions dynamically.
  • Highlighted the role of dynamical electronic correlations in topological electronic transitions.
  • Opened a new avenue for ultrafast control of Fermi surface topology in quantum materials.