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E. Cheah

As seen in: Physical Review B
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Articles by E. Cheah

Quantum Hall effect in InAsSb quantum wells at elevated temperatures

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By M. E. Bal, E. Cheah
| Physical Review B
We have characterized the electronic properties of a high-mobility two-dimensional electron system in modulation doped InAsSb quantum wells and compare them to InSb quantum wells grown in a similar fashion. Using temperature-dependent Shubnikov-de Haas experiments as well as FIR transmission, we find an effective mass of , which is lower than in the investigated InSb quantum well, but due to a rather strong confinement still higher than in the corresponding bulk compound.
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Measurements of Phase Dynamics in Planar Josephson Junctions and SQUIDs

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By IBM Europe, R. Schott, E. Cheah
| Physical Review B
Abstract We experimentally investigate the stochastic phase dynamics of planar Josephson junctions (JJs) and superconducting quantum interference devices (SQUIDs) defined in epitaxial InAs/Al heterostructures, and characterized by a large ratio of Josephson energy to charging energy. We observe a crossover from a regime of macroscopic quantum tunneling to one of phase diffusion as a function of temperature, where the transition temperature T* is gate-tunable.
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