Pellegrini V, Pinczuk A, Dennis BS, Plaut AS, Pfeiffer LN, West KW
V. Pellegrini, Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA, and Scuola Normale Superiore and Istituto Nazionale per la Fisica della Materia, Pisa, Italy. A. Pinczuk, Bell Laboratories, Lucent Technologies, Murray Hill.
Science. 1998 Aug 7;281(5378):799-802. doi: 10.1126/science.281.5378.799.
Inelastic light scattering by low-energy spin-excitations reveals three distinct configurations of spin of electron double layers in gallium arsenide quantum wells at even-integer quantum Hall states. The transformations among these spin states appear as quantum phase transitions driven by the interplay between Coulomb interactions and Zeeman splittings. One of the transformations correlates with the emergence of a spin-flip intersubband excitation at vanishingly low energy and provides direct evidence of a link between quantum phase transitions and soft collective excitations in a two-dimensional electron system.
低能自旋激发的非弹性光散射揭示了砷化镓量子阱中电子双层在偶数整数量子霍尔态下三种不同的自旋构型。这些自旋态之间的转变表现为由库仑相互作用和塞曼分裂之间的相互作用驱动的量子相变。其中一种转变与极低能量下自旋翻转子带间激发的出现相关，并为二维电子系统中量子相变与软集体激发之间的联系提供了直接证据。
