Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel.
Phys Rev Lett. 2010 Aug 27;105(9):096801. doi: 10.1103/PhysRevLett.105.096801. Epub 2010 Aug 23.
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.
我们应用偏振分辨光致发光谱来测量在垂直磁场中的二维电子气的自旋极化。我们发现 σ+ 和 σ− 偏振之间的分裂在 ν=5/2 时急剧下降，并且等于裸的塞曼能，这类似于偶数填充因子的行为。我们表明这种行为与填充因子 ν=5/2 是无极化的相一致。
