Mani Chandra, nOhm Devices, Inc.: "Efficient readout electronics using non-Ohmic charge transport in high-mobility two-dimensional semiconductors"

Thursday 14 Aug 2025, 12:00 → 13:00 US/Pacific

Room 50A-5132

and zoom: https://lbnl.zoom.us/j/93517011536https://lbnl.zoom.us/j/96317129443?pwd=kXRI9b6kIGWBbwuME4j5fQB1a8ikqD.1
 

Abstract: 

Charge transport in semiconductors is usually diffusive ("Ohmic") due to electrons scattering off defects and phonons, as described by the textbook Ohm's law. However, in sufficiently clean two-dimensional materials, Ohm's law breaks down and gives rise to novel "non-Ohmic" charge transport regimes wherein electrons flow like a fluid. The non-Ohmic regimes - ballistic and hydrodynamic transport - allow for the creation of highly-efficient electronic devices, with much lower power consumption and heat dissipation compared to current generation electronics which are based on field-effect transistors. I will present an overview of transport physics in semiconductors and talk about our efforts to use non-Ohmic charge transport to design highly-efficient readout electronics - amplifiers and mixers - that can be co-located with qubits and various quantum sensors in the innermost cryostage of dilution refrigerators, where the cooling power is limited to ~1 mW.