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PHONON EXCITATIONS OF COMPOSITE FERMION LANDAU LEVELS

机译:复合费米子朗道级的声子激发

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摘要

Energy gaps in the fractional quantum Hall regime are measured with phonon spec-troscopy for various electron densities and filling factors ν = 1/3, 2/5, 4/7, 3/5, 2/3, 4/3, and 5/3. At a given filling factor nearly all gaps measured show a square-root dependence on the magnetic field. The measured gaps can be described well with composite fermion theory: They are transitions between composite fermion Landau levels that are not affected by disorder on phonon wavelength. All transitions can be described by one single fit parameter related to the composite fermion effective mass. In contrast, the gaps at filling factor ν = 2/3 in the high fields regime show a linear field dependence. This hints onto an only partially polarized ground state of 2/3.
机译:对于不同的电子密度和填充因子ν= 1 / 3、2 / 5、4 / 7、3 / 5、2 / 3、4 / 3和5,通过声子光谱法测量了分数量子霍尔状态下的能隙。 / 3。在给定的填充系数下,几乎所有测量到的间隙都显示出对磁场的平方根依赖性。可以使用复合费米子理论很好地描述测得的间隙:它们是复合费米子Landau能级之间的过渡,不受声子波长无序影响。可以通过与复合费米子有效质量有关的一个单一拟合参数来描述所有跃迁。相反,在高场条件下,填充因子ν= 2/3时的间隙显示出线性场依赖性。这暗示只有2/3的部分极化的基态。

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