Modulation of bilayer quantum Hall states by tilted-field-induced subband-Landau-level coupling

We study effects of tilted magnetic fields on energy levels in a double-quantum-well (DQW) system, focusing on the coupling of subbands and Landau levels (LLs). The subband-LL coupling induces anticrossings between LLs, manifested directly in the magnetoresistance. The anticrossing gap becomes larger than the spin splitting at the tilting angle � ∼ 20 ◦ and larger than the cyclotron energy at � ∼ 50 ◦ , demonstrating that the subband-LL coupling exerts a strong influence ⊥ +

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