Related Experiment Video
Updated: Aug 16, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Composite-fermion spin excitations as nu approaches 1/2: interactions in the Fermi sea
Irene Dujovne1, A Pinczuk, Moonsoo Kang
1Department of Applied Physics and Applied Math, Columbia University, New York, New York 10027, USA.
Abstract:
Measurements of low-lying spin excitations by inelastic light scattering unveil a delicate balance between spin reversal and Fermi energies in the Fermi sea of composite fermions that emerges in the limit of nu --> 1/2. The interplays between these two fundamental quasiparticle interactions are uncovered in lowest spin-flip excitations in which the spin orientation and Landau level index of composite fermions change simultaneously. A collapse of the spin-flip excitation gap as nu --> 1/2 is linked to vanishing quasiparticle energy level spacings and loss of full spin polarization.
Related Concept Videos
Fermi Level
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
Atomic Nuclei: Nuclear Spin State Overview
Fermi Level Dynamics
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Valence Bond Theory
Valence Bond Theory
Atomic Nuclei: Nuclear Spin State Population Distribution

