The speaker for our next meetup on Monday, February 12, 2024 will be Mani Chandra from nOhm.
The meetup will be at Quantbot Technologies at 505 5th Ave (roughly 5th & E42nd) on the 6th floor.
Title: Efficient non-Ohmic charge transport in two-dimensional semiconductors
Description: Charge transport in semiconductors is usually diffusive ("Ohmic") due to electrons scattering off defects & phonons, as described by the textbook Ohm's law. However, in sufficiently clean two-dimensional materials, Ohm's law breaks down & gives rise to novel "non-Ohmic" charge transport regimes wherein electrons flow like a fluid. These novel regimes - ballistic & hydrodynamic transport - allow for the creation of highly-efficient electronic devices, with much lower power consumption & heat dissipation compared to current generation electronics (which are based on field-effect transistors). I will present an overview of transport physics in semiconductors & talk about our efforts to use non-Ohmic charge transport to design highly-efficient readout electronics that can be co-located with qubits & various quantum sensors in the innermost cryostage of dilution refrigerators, where the cooling power is limited to ~1 mW. The resulting integrated cryogenic electronics will enable the scaling up of quantum systems, similar to the historical progression from discrete transistors to integrated circuits.
Bio: Mani Chandra is the CEO of nOhm Devices, a recently incorporated startup being incubated at MIT. nOhm is developing a new type of amplifier with superior performance in terms of electrical noise, bandwidth & heat dissipation, based on non-Ohmic ("nOhm") charge transport in two-dimensional semiconductors, initially targeting quantum computing & quantum sensing applications. He obtained his PhD in 2016 in high-energy astrophysics from the University of Illinois, Urbana-Champaign where he was an Illinois Distinguished Fellow. His thesis on extended general relativistic magnetohydrodynamics to model accretion disks around supermassive black holes has been awarded the Astronomy Department's Chu award for research excellence. He has since applied his expertise in fluid dynamics & kinetic theory to device physics, motivated by recent discoveries of hydrodynamic charge transport in various materials. nOhm Devices is an outcome of work by him & his collaborators to develop a new technological platform that overcomes the fundamental limitations inherent to field effect transistors that underlie all current electronics.