Abstract
The investigation of novel electronic phases in low-dimensional quantum materials demands for the concurrent development of new measurement techniques that combine surface sensitivity with high spatial resolution and high measurement accuracy. We propose a new quantum sensing imaging modality based on superconducting charge qubits to study dissipative charge carrier dynamics with nanometer spatial and high temporal resolution. Using analytical and numerical calculations we show that superconducting charge qubit microscopy (SCQM) has the potential to resolve temperature and resistivity changes in a sample as small as $\Delta T\leq0.1\;$mK and $\Delta\rho\leq1\cdot10^{4} \,\Omega\cdot$cm, respectively. Among other applications, SCQM will be especially suited to study the microscopic mechanisms underlying interaction driven quantum phase transitions, to investigate the boundary modes found in novel topological insulators and, in a broader context, to visualize the dissiaptive charge carrier dynamics occurring in mesoscopic and nanoscale devices.
Highlights
Protected boundary modes in higher order topological insulators [1,2] and correlated electronic states in magic angle twisted bilayer graphene [3,4] represent only two recent examples of novel quantum phases of matter, which promise new insights into questions of topological matter and many-body physics and which carry the prospect of potential technological applications such as dissipation-less electronic charge transport, spintronic devices, and topological quantum computation.To date, insights on these quantum materials are derived from transport experiments that measure a global resistance drop across a device, or from other experimental techniques, such as photoelectron spectroscopy or scanning tunneling microscopy, which can map out the equilibrium electronic density of states
Insights on these quantum materials are derived from transport experiments that measure a global resistance drop across a device, or from other experimental techniques, such as photoelectron spectroscopy or scanning tunneling microscopy, which can map out the equilibrium electronic density of states
We proposed superconducting-charge-qubit microscopy (SCQM) as a new quantum sensing imaging modality to study dissipative charge-carrier dynamics in low-dimensional quantum materials
Summary
Protected boundary modes in higher order topological insulators [1,2] and correlated electronic states in magic angle twisted bilayer graphene [3,4] represent only two recent examples of novel quantum phases of matter, which promise new insights into questions of topological matter and many-body physics and which carry the prospect of potential technological applications such as dissipation-less electronic charge transport, spintronic devices, and topological quantum computation. Insights on these quantum materials are derived from transport experiments that measure a global resistance drop across a device, or from other experimental techniques, such as photoelectron spectroscopy or scanning tunneling microscopy, which can map out the equilibrium electronic density of states. All these measurements are inherently insensitive to charge-carrier dynamics at small length scales, which dictate the global material properties. The exploration of quantum materials will be accelerated by the concurrent development of new measurement techniques with the ability to measure such local properties with high sensitivity and high spatial resolution. The low-temperature operation of these techniques is often limited by technical constraints to temperatures above 1 K, contesting their applicability for the investigation of new quantum phases of matter at lowest temperatures
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