Measuring the spectrum of “magnetorotons”
DOI: 10.1063/PT.5.023376
In last week’s Science Kukushkin and colleagues describe a variant of this technique for measuring the energy and momentum dependence of the excitations of a two-dimensional (2D) electron system.
In this technique, momentum is imparted with sound and, separately, energy is imparted with light. This approach allows the spectrum of “magnetorotons"âmdash;characteristic excitations of the states associated with the fractional quantum Hall effectâmdash;to be measured directly.
The observed spectral features were predicted many years ago but have eluded direct measurement until now.
Related Link
Dispersion of the Excitations of Fractional Quantum Hall States
