5 Key Takeaways

• 1

  Researchers at the University of Basel tracked energy flow in germanium using ultrafast spectroscopy techniques.

• 2

  Energy transfers from photoexcited holes to optical phonons within picoseconds, raising their effective temperature.

• 3

  Optical phonons cool and decay into acoustic phonons in 2-3 picoseconds through anharmonic interactions.

• 4

  Transient reflection measurements revealed Brillouin oscillations linked to coherent acoustic strain in the crystal.

• 5

  Understanding energy redistribution in semiconductors is crucial for improving electronic device performance and thermal management.