各向同性二维电子系统中自旋完全极化的有效质量抑制
Effective mass suppression upon complete spin-polarization in an isotropic two-dimensional electron system
摘要：
我们测量的有效质量（m*）的相互作用的二维电子局限于一个4.5 nm宽的AlAs量子阱。该阱中的电子占据具有各向同性面内费米轮廓的单个面外导带谷。当电子部分自旋极化时，m* 大于其能带值，并随着密度的减小而增大。然而，当通过施加强平行磁场将系统驱动到全自旋极化时，m* 被抑制到接近或甚至低于带质量的值。我们的结果是一致的宽AlAs量子阱中的电子占据一个各向异性的费米轮廓和有效质量的面内谷与先前报道的测量，并建议，有效质量抑制后，完全自旋极化是一个真正的相互作用的二维电子的属性。
英文摘要：
We measure the effective mass (m*) of interacting two-dimensional electrons confined to a 4.5 nm-wide AlAs quantum well. The electrons in this well occupy a single out-of-plane conduction band valley with an isotropic in-plane Fermi contour. When the electrons are partially spin polarized, m* is larger than its band value and increases as the density is reduced. However, as the system is driven to full spin-polarization via the application of a strong parallel magnetic field, m* is suppressed down to values near or even below the band mass. Our results are consistent with the previously reported measurements on wide AlAs quantum wells where the electrons occupy an in-plane valley with an anisotropic Fermi contour and effective mass, and suggest that the effective mass suppression upon complete spin polarization is a genuine property of interacting two-dimensional electrons.
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