Dujovne Irene, Pinczuk A, Kang Moonsoo, Dennis B S, Pfeiffer L N, West K W
Department of Applied Physics and Applied Math, Columbia University, New York, New York 10027, USA.
Phys Rev Lett. 2005 Jul 29;95(5):056808. doi: 10.1103/PhysRevLett.95.056808.
Measurements of low-lying spin excitations by inelastic light scattering unveil a delicate balance between spin reversal and Fermi energies in the Fermi sea of composite fermions that emerges in the limit of nu --> 1/2. The interplays between these two fundamental quasiparticle interactions are uncovered in lowest spin-flip excitations in which the spin orientation and Landau level index of composite fermions change simultaneously. A collapse of the spin-flip excitation gap as nu --> 1/2 is linked to vanishing quasiparticle energy level spacings and loss of full spin polarization.
通过非弹性光散射对低能自旋激发进行测量，揭示了在复合费米子的费米海中，自旋反转与费米能量之间存在一种微妙的平衡，这种平衡出现在 ν→1/2 的极限情况下。在最低的自旋翻转激发中，复合费米子的自旋取向和朗道能级指数同时发生变化，从而揭示了这两种基本准粒子相互作用之间的相互作用。随着 ν→1/2，自旋翻转激发能隙的崩塌与准粒子能级间距的消失以及完全自旋极化的丧失有关。
