Odd-even spin effects and variation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>g</mml:mi></mml:math>factor in a quasi-one-dimensional subband

Abstract

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.