Frequencies of the Edge-Magnetoplasmon Excitations in Gated Quantum Hall Edges
Abstract
We have investigated microwave transmission through the edge of quantum Hall systems by employing a coplanar waveguide (CPW) fabricated on the surface of a GaAs/AlGaAs two-dimensional electron gas (2DEG) wafer. An edge is introduced to the slot region of the CPW by applying a negative bias Vg to the central electrode (CE) and depleting the 2DEG below the CE. We observe peaks attributable to the excitation of edge magnetoplasmons (EMP) at a fundamental frequency f0 and at its harmonics if0 (i = 2,3, \ldots ). The frequency f0 increases with decreasing Vg, indicating that EMP propagates with higher velocity for more negative Vg. The dependence of f0 on Vg is interpreted in terms of the variation in the distance between the edge state and the CE, which alters the velocity by varying the capacitive coupling between them. The peaks are observed to continue, albeit with less clarity, up to the regions of Vg where 2DEG still remains below the CE.
- Publication:
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Journal of the Physical Society of Japan
- Pub Date:
- June 2018
- DOI:
- 10.7566/JPSJ.87.064709
- arXiv:
- arXiv:1804.09330
- Bibcode:
- 2018JPSJ...87f4709E
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 8 pages, 8 figures