Leon Maurer
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View article: Airborne acoustic emission enables sub-scanline keyhole porosity quantification and effective process characterization for metallic laser powder bed fusion
Airborne acoustic emission enables sub-scanline keyhole porosity quantification and effective process characterization for metallic laser powder bed fusion Open
Keyhole-induced (KH) porosity, which arises from unstable vapor cavity dynamics under excessive laser energy input, remains a significant challenge in laser powder bed fusion (LPBF). This study presents an integrated experimental and data-…
View article: Using a high-fidelity numerical model to infer the shape of a few-hole Ge quantum dot
Using a high-fidelity numerical model to infer the shape of a few-hole Ge quantum dot Open
The magnetic properties of hole quantum dots in Ge are sensitive to their shape due to the interplay between strong spin-orbit coupling and confinement. We show that the split-off band, surrounding SiGe layers, and hole-hole interactions h…
View article: A Quantum Analog Coprocessor for Correlated Electron Systems Simulation
A Quantum Analog Coprocessor for Correlated Electron Systems Simulation Open
Analog quantum simulation is an approach for studying physical systems that might otherwise be computationally intractable to simulate on classical high-performance computing (HPC) systems. The key idea behind analog quantum simulation is …
View article: Low thermal budget high-k/metal surface gate for buried donor-based devices
Low thermal budget high-k/metal surface gate for buried donor-based devices Open
Atomic precision advanced manufacturing (APAM) offers creation of donor devices in an atomically thin layer doped beyond the solid solubility limit, enabling unique device physics. This presents an opportunity to use APAM as a pathfinding …
View article: Atomic Precision Advanced Manufacturing for Digital Electronics
Atomic Precision Advanced Manufacturing for Digital Electronics Open
The ability to place atoms one by one at specific atomic sites was first used to create functioning electronic devices in the late 1990s. Since then, the process known as atomic precision advanced manufacturing (APAM) has been further deve…
View article: Gate-Defined Quantum Dots in Ge/SiGe Quantum Wells as a Platform for Spin Qubits
Gate-Defined Quantum Dots in Ge/SiGe Quantum Wells as a Platform for Spin Qubits Open
In the field of semiconductor quantum dot spin qubits, there is growing interest in leveraging the unique properties of hole-carrier systems and their intrinsically strong spin-orbit coupling to engineer novel qubits. Recent advances in se…
View article: Creation of nanoscale magnetic fields using nano-magnet arrays
Creation of nanoscale magnetic fields using nano-magnet arrays Open
We present the fabrication of nano-magnet arrays, comprised of two sets of interleaving SmCo5 and Co nano-magnets, and the subsequent development and implementation of a protocol to program the array to create a one-dimensional rotating ma…
View article: Hole Spin Qubits in Germanium
Hole Spin Qubits in Germanium Open
Holes in germanium-rich heterostructures provide a compelling alternative for achieving spin based qubits compared to traditional approaches such as electrons in silicon. In this project, we addressed the question of whether holes in Ge/Si…
View article: Engineering Spin-Orbit Interaction in Silicon
Engineering Spin-Orbit Interaction in Silicon Open
There has been much interest in leveraging the topological order of materials for quantum information processing. Among the various solid-state systems, one-dimensional topological superconductors made out of strongly spin-orbit-coupled na…
View article: Valley splitting of single-electron Si MOS quantum dots
Valley splitting of single-electron Si MOS quantum dots Open
Silicon-based metal-oxide-semiconductor quantum dots are prominent candidates for high-fidelity, manufacturable qubits. Due to silicon's band structure, additional low-energy states persist in these devices, presenting both challenges and …
View article: Rayleigh waves, surface disorder, and phonon localization in nanostructures
Rayleigh waves, surface disorder, and phonon localization in nanostructures Open
We introduce a technique to calculate thermal conductivity in disordered\nnanostructures: a finite-difference time-domain (FDTD) solution of the elastic\nwave equation combined with the Green-Kubo formula. The technique captures\nphonon wa…