Optical probing of the spin polarization of the ν=5/2 quantum Hall state.
We apply polarization resolved photoluminescence spectroscopy to measure the spin polarization of a two dimensional electron gas in perpendicular magnetic field. We find that the splitting between the σ+ and σ- polarizations exhibits a sharp drop at ν=5/2 and is equal to the bare Zeeman energy, which resembles the behavior at even filling factors. We show that this behavior is consistent with filling factor ν=5/2 being unpolarized.
Stern
M
M
Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel. mstern@weizmann.ac.il
Plochocka
P
P
Umansky
V
V
Maude
D K
DK
Potemski
M
M
Bar-Joseph
I
I