Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
Phys Rev Lett. 2009 Dec 18;103(25):256403. doi: 10.1103/PhysRevLett.103.256403. Epub 2009 Dec 17.
We introduce an interlayer coherent composite Fermi liquid for nu = 1/2 + 1/2 bilayers, in which interlayer Coulomb repulsion drives exciton condensation of composite fermions. As a result, composite fermions propagate coherently between layers--even though electrons do not--and form bonding and antibonding Fermi seas. This phase is compressible with respect to symmetric currents but quantum Hall-like in the counterflow channel. Quantum oscillations of the composite Fermi seas generate a new series of incompressible states at nu = p/[2(p +/- 1)] per layer (p an integer), which is a bilayer analogue of Jain's sequence.
我们为 nu = 1/2 + 1/2 双层系统引入了一种层间相干复合费米液体，其中层间库仑排斥作用驱动复合费米子的激子凝聚。结果，复合费米子在层间相干地传播——即使电子不能——并形成键合和反键合费米海。与对称电流相比，该相是可压缩的，但在逆流通道中具有量子霍尔效应。复合费米海的量子振荡在每一层产生一个新的不可压缩态系列，nu = p/[2(p +/- 1)]（p 为整数），这是 Jain 序列的双层类似物。
