[1] Halperin is an experimentalist in condensed matter physics specializing in ultra-low temperature investigations of quantum liquids and solids, notably liquid and solid 3He (the light isotope of helium), superconducting quantum materials and unconventional superconductivity, magnetic compounds, highly porous materials including aerogels, porous glasses and cements.
He also held a brief appointment in 1984 at the Centre National de Recherche Scientifique as Chercheur Associé in Grenoble, France.
[1] Halperin was appointed as chair of the Department of Physics and Astronomy from 1991 till 1996, and Director of the Integrated Science Program at Northwestern University from 1998 to 2003.
[1] Halperin's research is focused on condensed matter physics, with a particular attention to ultra-low temperature investigations of quantum liquids and solids, notably liquid and solid 3He (the light isotope of helium), unconventional superconductivity, magnetic compounds, highly porous materials including aerogels, porous glasses and cements.
The NMR frequency shifts in the A phase were accounted for by Leggett[11] within a framework of the theory of electron superconductivity by Bardeen, Cooper, and Schrieffer (1957).
[13] They also discovered that these transverse sound waves in 3He exhibit Faraday rotation of their polarization in the presence of a magnetic field.
[17][18] A new area of research in quantum fluids opened with the discovery of impurity phases of superfluid 3He by Parpia[19] and by Halperin[20] described theoretically by Sauls.