紧密间距石墨烯双层中相互作用驱动的电荷转移跃迁
Interaction driven charge transfer transitions in closely spaced graphene double layers
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中文总结 AI 辅助
该研究通过隧穿谱学发现紧密间距石墨烯双层量子霍尔铁磁体的电荷转移由相互作用驱动的相变主导，揭示了层内与层间交换的不同作用，确立层间隧穿为探测相关电子系统的有力工具。
中文摘要 AI 辅助
导体间的电荷转移通常被视为由静电学和能带排列控制的单粒子过程。我们利用隧穿谱学技术表明，紧密间距的石墨烯双层量子霍尔铁磁体中的电荷转移，实际上是通过一系列由电容充电与库仑交换相互作用竞争所控制的相互作用驱动相变进行的。实验数据与理论计算的对比，确定了相互作用驱动电荷转移跃迁的谱学特征，并揭示该电荷转移会重构准粒子谱。层内交换有利于自旋-谷子带在两层之间的 abrupt 转移，层间交换则稳定了使电荷转移得以渐进发生的相干中间相。我们的研究确立了层间隧穿作为探测准粒子谱本身依赖于偏压的相互作用电子系统的强大工具。
英文摘要
Charge transfer between two conductors is conventionally viewed as a single-particle process governed by electrostatics and band alignment. Using tunneling spectroscopy, we show that charge transfer in closely spaced graphene double layer quantum Hall ferromagnets instead proceeds through a sequence of interaction driven phase transitions governed by the competition between capacitive charging and Coulomb exchange interactions. A comparison of experimental data and theoretical calculations identifies spectroscopic signatures of the interaction driven charge transfer transitions, and reveals that this charge transfer reconstructs the quasiparticle spectrum. While intralayer exchange favors abrupt transfer of entire spin-valley subbands between the layers, interlayer exchange stabilizes coherent intermediate phases that enable gradual charge transfer. Our results establish interlayer tunneling as a powerful probe of interacting electronic systems whose quasiparticle spectrum is itself bias dependent.
