R. G. Herb Condensed Matter Seminars

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Events During the Week of May 5th through May 12th, 2019

Monday, May 6th, 2019

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Tuesday, May 7th, 2019

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Wednesday, May 8th, 2019

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Thursday, May 9th, 2019

Quantum piezoacoustics: From low-dimensional electrons to qubits
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Johannes Pollanen, Michigan State University
Abstract: Our research group is working on creating and discovering electronic quantum states of matter in low-dimensional electron systems and controlling tailor-made quantum circuits. I will discuss our work developing hybrid piezoacoustic devices for coupling high frequency microwaves to two-dimensional electron systems. In particular I will highlight our recent results demonstrating in situ gate-tunable acoustoelectric transport in exfoliated monolayer graphene by measuring the voltage created as high-frequency surface acoustic waves dynamically drive charge carriers in the graphene. We employ a flip-chip device configuration to conduct these acoustoelectric measurements while simultaneously controlling the graphene carrier density with a metal-oxide back-gate. I will also describe our efforts to couple this hybrid piezoacoustic devices to superconducting circuit based quantum bits and to a unique low-dimensional electron system formed by trapping an ensemble of electrons in vacuum above the free surface of superfluid helium.
Host: Robert McDermott
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Friday, May 10th, 2019

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