Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2018 Jun 29;120(26):266601. doi: 10.1103/PhysRevLett.120.266601.
Tunneling of electrons into a two-dimensional electron system is known to exhibit an anomaly at low bias, in which the tunneling conductance vanishes due to a many-body interaction effect. Recent experiments have measured this anomaly between two copies of the half-filled Landau level as a function of in-plane magnetic field, and they suggest that increasing spin polarization drives a deeper suppression of tunneling. Here, we present a theory of the tunneling anomaly between two copies of the partially spin-polarized Halperin-Lee-Read state, and we show that the conventional description of the tunneling anomaly, based on the Coulomb self-energy of the injected charge packet, is inconsistent with the experimental observation. We propose that the experiment is operating in a different regime, not previously considered, in which the charge-spreading action is determined by the compressibility of the composite fermions.
电子隧穿到二维电子系统中，在低偏压下会表现出反常现象，其中由于多体相互作用效应，隧穿电导会消失。最近的实验已经测量了作为面内磁场函数的两个半满朗道能级之间的这种反常现象，并表明自旋极化的增加会导致隧穿更深的抑制。在这里，我们提出了一个关于两个部分自旋极化的哈尔彭-李-里德态之间隧穿反常的理论，并表明基于注入电荷包的库仑自能的传统隧穿反常描述与实验观测不一致。我们提出实验处于一个以前未考虑的不同状态，其中电荷扩散作用由复合费米子的压缩性决定。
