Odd-even spin effects and variation of g factor in a quasi-one-dimensional subband

Odd-even spin effects and variation of g factor in a quasi-one-dimensional subband

Four odd-even spin phenomena are observed in electronic transport through a quantum wire. They consistently imply that a quasi-one-dimensional system tends to a spontaneous spin polarization with the energy band of minority spin-up electrons being reluctant to populate, thus widening the spin gap in energy. Variation of g factor within a single subband is measured using a dc conductance technique, showing clear evidence of an oscillatory g value as 1D subbands are filled one by one with increasing carrier density.

在通过量子线的电子输运中观察到四种奇偶自旋现象。它们一致表明，准一维系统倾向于自发自旋极化，少数自旋向上的电子的能带不易被占据，从而加宽了能量中的自旋能隙。使用直流电导技术测量了单个子带内的g因子变化，随着载流子密度增加，一维子带逐个被填充时，g值呈现振荡，这一现象提供了明确证据。