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首页> 外文期刊>Physica, B. Condensed Matter >Many-body interactions, the quantum Hall effect, and insulating phases in bilayer two-dimensional hole-gas systems
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Many-body interactions, the quantum Hall effect, and insulating phases in bilayer two-dimensional hole-gas systems

机译：双层二维空穴-气体系统中的多体相互作用，量子霍尔效应和绝缘相

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We have studied the quantum Hall effect in a high mobility double-layer 2D hole gas in which we are able to control the carrier density in the two layers independently. We find that both the v = 1 and the v = 3/2 bilayer quantum Hall (QH) states are destroyed with increasing carrier density. The collapse of v = 1 is extremely abrupt, occurring at a carrier density that corresponds to an inter-layer separation of 1.8l(B). However, although the v = 3/2 QH state disappears without trace, the zero in rho(xx) at v = 1 is replaced by a broad minimum similar to that observed at v = 1/2 when only one layer is occupied. This suggests that we are observing a transition from a correlated incompressible QH state with total filling factor v = 1 to a compressible state consisting of two (possibly uncorrelated) layers of 'composite fermions'. At very low densities and filling factors below v = 1, an insulating phase is observed, which is not present when only one layer is occupied. We demonstrate that this state is entirely due to inter-layer interactions and is strong evidence for the existence of a bilayer Wigner crystal. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 10]
机译：我们已经研究了高迁移率双层2D空穴气体中的量子霍尔效应，其中我们能够独立控制两层中的载流子密度。我们发现v = 1和v = 3/2双层量子霍尔（QH）状态都随着载流子密度的增加而被破坏。 v = 1的崩溃是非常突然的，其发生在与1.8l（B）的层间间距相对应的载流子密度上。但是，尽管v = 3/2 QH状态消失了，但在v = 1时rho（xx）中的零被一个很宽的最小值所替代，类似于只占据一层时在v = 1/2时所观察到的最小值。这表明我们正在观察从总填充因子v = 1的相关不可压缩QH状态到由“复合费米子”两层（可能不相关）组成的可压缩状态的过渡。在非常低的密度和填充系数低于v = 1的情况下，观察到绝缘相，当仅占据一层时，绝缘相就不存在。我们证明了这种状态完全是由于层间的相互作用，并且是存在双层维格纳晶体的有力证据。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：10]

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