Kuzma NN, Khandelwal P, Barrett SE, Pfeiffer LN, West KW
N. N. Kuzma, P. Khandelwal, S. E. Barrett, Department of Physics, Yale University, New Haven, CT 06511, USA. L. N. Pfeiffer and K. W. West, Lucent Technologies, Bell Laboratories, Murray Hill, NJ 07974, USA.
Science. 1998 Jul 31;281(5377):686-90. doi: 10.1126/science.281.5377.686.
Optically pumped nuclear magnetic resonance (OPNMR) measurements were performed in two different electron-doped multiple quantum well samples near the fractional quantum Hall effect ground state nu = 13. Below 0.5 kelvin, the spectra provide evidence that spin-reversed charged excitations of the nu = 13 ground state are localized over the NMR time scale of about 40 microseconds. Furthermore, by varying NMR pulse parameters, the electron spin temperature (as measured by the Knight shift) could be driven above the lattice temperature, which shows that the value of the electron spin-lattice relaxation time tau1s is between 100 microseconds and 500 milliseconds at nu = 13.
在接近分数量子霍尔效应基态ν = 1/3的两个不同电子掺杂多量子阱样品中进行了光泵浦核磁共振（OPNMR）测量。在低于0.5开尔文的温度下，光谱表明ν = 1/3基态的自旋反转带电激发在约40微秒的核磁共振时间尺度上是局域化的。此外，通过改变核磁共振脉冲参数，可以将电子自旋温度（由奈特位移测量）驱动到高于晶格温度，这表明在ν = 1/3时电子自旋-晶格弛豫时间τ1s的值在100微秒到500毫秒之间。
