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Large Zeeman Splitting in Out-of-Plane Magnetic Field in a Double-Layer Quantum Point Contact

In this study, we observe that the conductance of a quantum point contact on a GaAs/AlGaAs double quantum well depends significantly on the magnetic field perpendicular to the two-dimensional electron gas. In the presence of the magnetic field, the subband edge splitting due to the Zeeman energy reaches 0.09 meV at 0.16 T, thereby suggesting an enhanced g-factor. The estimated g-factor enhancement is 17.5 times that of the bare value. It is considered that a low electron density and high mobility makes it possible to reach a strong many-body interaction regime in which this type of strong enhancement in g-factor can be observed.

preprint2021arXivOpen access
D. TerasawaS. NorimotoT. ArakawaM. FerrierA. FukudaK. KobayashiY. Hirayama
cond-mat.mes-hall
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D. TerasawaS. NorimotoT. ArakawaM. FerrierA. FukudaK. KobayashiY. Hirayama

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