Evidence for a correlated phase of skyrmions observed in real space
Evidence for a correlated phase of skyrmions observed in real space
复制标题
DOI：
10.1103/physrevb.98.161402
复制
发表时间：
2018-06
影响因子：
3.7
通讯作者：
John N Moore;Hikaru Iwata;J. Hayakawa;T. Mano;T. Noda;N. Shibata;G. Yusa
中科院分区：
文献类型：
--
作者：
John N Moore;Hikaru Iwata;J. Hayakawa;T. Mano;T. Noda;N. Shibata;G. Yusa
我们用对电子和核自旋极化都敏感的光致发光显微镜研究了GaAs二维电子系统(2DES)中第一整量子霍尔态附近磁序的变化。我们观察到电子自旋极化和核自旋纵向弛豫时间的不连续性，这预示着磁有序的自发跃迁。我们在真实空间中描绘了在这种转变中共存的自旋相域，并观察到它们的形成作为2DES化学势的函数的滞后。基于倾斜磁场方向的测量，我们发现该相变受到包含塞曼能量的能隙的保护。我们解释说，这些观测结果与在跃迁时形成的Skyrmions相一致。
We conduct photoluminescence microscopy that is sensitive to both electron and nuclear spin polarization to investigate the changes that occur in the magnetic ordering in the vicinity of the first integer quantum Hall state in a GaAs two-dimensional electron system (2DES). We observe a discontinuity in the electron spin polarization and nuclear spin longitudinal relaxation time which heralds a spontaneous transition in the magnetic ordering. We image in real space the spin phase domains that coexist at this transition, and observe hysteresis in their formation as a function of the 2DES's chemical potential. Based on measurements in a tilted magnetic field orientation, we found that the transition is protected by an energy gap containing the Zeeman energy. We explain that these observations are consistent with a phase of skyrmions forming at the transition.