302 citations · 2k across the 52 of their papers we have counts for
12 papers · 2 filters
Possible nematic to smectic phase transition in a two-dimensional electron gas at half-filling
Q. Qian, J. Nakamura, S. Fallahi +2
Liquid crystalline phases of matter permeate nature and technology, with examples ranging from cell membranes to liquid-crystal displays. Remarkably, electronic liquid crystal phas…
Spin of a multielectron quantum dot and its interaction with a neighboring electron
Filip K. Malinowski, Frederico Martins, Thomas B. Smith +8
We investigate the spin of a multielectron GaAs quantum dot in a sequence of nine charge occupancies, by exchange coupling the multielectron dot to a neighboring two-electron doubl…
Impact of silicon doping on low frequency charge noise and conductance drift in GaAs/AlGaAs nanostructures
S. Fallahi, J. R. Nakamura, G. C. Gardner +2
We present measurements of low frequency charge noise and conductance drift in modulation doped GaAs/AlGaAs heterostructures grown by molecular beam epitaxy in which the silicon do…
A capacitance spectroscopy-based platform for realizing gate-defined electronic lattices
T. Hensgens, U. Mukhopadhyay, P. Barthelemy +6
Electrostatic confinement in semiconductors provides a flexible platform for the emulation of interacting electrons in a two-dimensional lattice, including in the presence of gauge…
Device Architecture for Coupling Spin Qubits Via an Intermediate Quantum State
X. G. Croot, S. J. Pauka, J. D. Watson +4
We demonstrate a scalable device architecture that facilitates indirect exchange between singlet-triplet spin qubits, mediated by an intermediate quantum state. The device comprise…
Gate-Sensing Charge Pockets in the Semiconductor Qubit Environment
X. G. Croot, S. J. Pauka, H. Lu +6
We report the use of dispersive gate sensing (DGS) as a means of probing the charge environment of heterostructure-based qubit devices. The DGS technique, which detects small shift…
Negative spin exchange in a multielectron quantum dot
Frederico Martins, Filip K. Malinowski, Peter D. Nissen +5
By operating a one-electron quantum dot (fabricated between a multielectron dot and a one-electron reference dot) as a spectroscopic probe, we study the spin properties of a gate-c…
Optimization of edge state velocity in the integer quantum Hall regime
Harshad Sahasrabudhe, Bozidar Novakovic, James Nakamura +5
Observation of interference in the quantum Hall regime may be hampered by a small edge state velocity due to finite phase coherence time. Therefore designing two quantum point cont…
Quantum Lifetime in Ultra-High Quality GaAs Quantum Wells: Relationship to and Impact of Density Fluctuations
Qi Qian, James R. Nakamura, Saeed Fallahi +6
We consider quantum lifetime derived from low-field Shubnikov-de Haas oscillations as a metric of quality of the two-dimensional electron gas in GaAs quantum wells that expresses l…
High temperature resistivity measured at ν = 5/2 as a predictor of 2DEG quality in the N=1 Landau level
Qi Qian, James R. Nakamura, Saeed Fallahi +3
We report a high temperature (T = 0.3K) indicator of the excitation gap at the filling factor fractional quantum Hall state in ultra-high quality AlGaAs/GaAs two…
Symmetric Operation of the Resonant Exchange Qubit
Filip K. Malinowski, Frederico Martins, Peter D. Nissen +5
We operate a resonant exchange qubit in a highly symmetric triple-dot configuration using IQ-modulated RF pulses. At the resulting three-dimensional sweet spot the qubit splitting…
Spectrum of the Nuclear Environment for GaAs Spin Qubits
Filip K. Malinowski, Frederico Martins, Łukasz Cywiński +7
Using a singlet-triplet spin qubit as a sensitive spectrometer of the GaAs nuclear spin bath, we demonstrate that the spectrum of Overhauser noise agrees with a classical spin diff…