Publications by Gabriel Aeppli

Large inverse Faraday effect for Rydberg states of free atoms and isolated donors in semiconductors

We report on the induction of magnetization in Rydberg systems by means of the inverse Faraday effect and propose the appearance of the effect in two such systems: Rydberg atoms proper and shallow dopants in semiconductors. Rydberg atoms are characterized ...

AMER PHYSICAL SOC2025

Roadmap on atomic-scale semiconductor devices

Gabriel Aeppli

Spin states in semiconductors provide exceptionally stable and noise-resistant environments for qubits, positioning them as optimal candidates for reliable quantum computing technologies. The proposal to use nuclear and electronic spins of donor atoms in s ...

IOP Publishing Ltd2025

High-performance 4-nm-resolution X-ray tomography using burst ptychography

Gabriel Aeppli, Manuel Guizar Sicairos

Advances in science, medicine and engineering rely on breakthroughs in imaging, particularly for obtaining multiscale, three-dimensional information from functional systems such as integrated circuits or mammalian brains. Achieving this goal often requires ...

NATURE PORTFOLIO2024

Anomalous electrons in a metallic kagome ferromagnet

Oleg Yazyev, Hyungjun Lee, Gabriel Aeppli, Daniel Gosalbez Martinez

Ordinary metals contain electron liquids within well-defined 'Fermi' surfaces at which the electrons behave as if they were non-interacting. In the absence of transitions to entirely new phases such as insulators or superconductors, interactions between el ...

Nature Portfolio2024

Spin waves and orbital contribution to ferromagnetism in a topological metal

Gabriel Aeppli

Honeycomb and kagome lattices can host propagating excitations with non-trivial topology as defined by their evolution along closed paths in momentum space. Excitations on such lattices can also be momentum-independent, and the associated flat bands are of ...

Nature Research2024

Kapitza Stabilization of Quantum Critical Order

Henrik Moodysson Rønnow, Gabriel Aeppli

Dynamical perturbations modify the states of classical systems in surprising ways and give rise to important applications in science and technology. For example, Floquet engineering exploits the possibility of band formation in the frequency domain when a ...

American Physical Society2024

Emergence of highly coherent two-level systems in a noisy and dense quantum network

Sandrine Gerber, Gabriel Aeppli

Quantum sensors and qubits are usually two-level systems (TLS), the quantum analogues of classical bits assuming binary values 0 or 1. They are useful to the extent to which superpositions of 0 and 1 persist despite a noisy environment. The standard prescr ...

Nature Portfolio2024

EUV-induced hydrogen desorption as a step towards large-scale silicon quantum device patterning

Gabriel Aeppli

Atomically precise hydrogen desorption lithography using scanning tunnelling microscopy (STM) has enabled the development of single-atom, quantum-electronic devices on a laboratory scale. Scaling up this technology to mass-produce these devices requires br ...

Nature Portfolio2024

Resistless EUV lithography: Photon-induced oxide patterning on silicon

Gabriel Aeppli

In this work, we show the feasibility of extreme ultraviolet (EUV) patterning on an HF-treated silicon (100) surface in the absence of a photoresist. EUV lithography is the leading lithography technique in semiconductor manufacturing due to its high resolu ...

AMER ASSOC ADVANCEMENT SCIENCE2023

Non-Destructive X-Ray Imaging of Patterned Delta-Layer Devices in Silicon

Gabriel Aeppli

The progress of miniaturization in integrated electronics has led to atomic and nanometer-sized dopant devices in silicon. Such structures can be fabricated routinely by hydrogen resist lithography, using various dopants such as P and As. However, the abil ...

WILEY2023

Momentum-Space Imaging of Ultra-Thin Electron Liquids in δ-Doped Silicon

Nicolò D'Anna, Gabriel Aeppli

Two-dimensional dopant layers (δ-layers) in semiconductors provide the high-mobility electron liquids (2DELs) needed for nanoscale quantum-electronic devices. Key parameters such as carrier densities, effective masses, and confinement thicknesses for 2DELs ...

WILEY2023

A universal route to efficient non-linear response via Thomson scattering in linear solids

Cheng Wang, Gabriel Aeppli, Joe Martin Bailey, Junjie Li, Min Chen, Ji Zhou

Non-linear materials are cornerstones of modern optics and electronics. Strong dependence on the intrinsic properties of particular materials, however, inhibits the at-will extension of demanding non-linear effects, especially those second-order ones, to w ...

OXFORD UNIV PRESS2023

Transfer learning application of self-supervised learning in ARPES

Gabriel Aeppli

There is a growing recognition that electronic band structure is a local property of materials and devices, and there is steep growth in capabilities to collect the relevant data. New photon sources, from small-laboratory-based lasers to free electron lase ...

IOP Publishing Ltd2023

Error measurements for a quantum annealer using the one-dimensional Ising model with twisted boundaries

Gabriel Aeppli

A finite length ferromagnetic chain with opposite spin polarization imposed at its two ends is one of the simplest frustrated spin models. In the clean classical limit the domain wall inserted on account of the boundary conditions resides with equal probab ...

NATURE PORTFOLIO2022

Electronic Structure of InAs and InSb Surfaces: Density Functional Theory and Angle-Resolved Photoemission Spectroscopy

Gabriel Aeppli, Vladimir N. Strocov

The electronic structure of surfaces plays a key role in the properties of quantum devices. However, surfaces are also the most challenging to simulate and engineer. Here, the electronic structure of InAs(001), InAs(111), and InSb(110) surfaces is studied ...

WILEY2022

In operando charge transport imaging of atomically thin dopant nanostructures in silicon

Gabriel Aeppli

Novel approaches to materials design, fabrication processes and device architectures have accelerated next-generation electronics component production, pushing device dimensions down to the nano- and atomic-scale. For device metrology methods to keep up wi ...

ROYAL SOC CHEMISTRY2022

Impact of band-bending on the k-resolved electronic structure of Si-doped GaN

Gabriel Aeppli

Band bending at semiconductor surfaces and interfaces is the key to applications ranging from classical transistors to topological quantum computing. A semiconductor particularly important for optical as well as microwave devices is GaN. What makes the mat ...

2022

Precise determination of the low-energy electronuclear Hamiltonian of LiY1-xHoxF4

Michael Müller, Sandrine Gerber, Gabriel Aeppli

The insulating rare-earth magnet LiY1-xHoxF4 has received great attention because a laboratory field applied perpendicular to its crystallographic c axis converts the low-energy electronic spin Hamiltonian into the (dilute) transverse field Ising model. Th ...

2022

A perfect X-ray beam splitter and its applications to time-domain interferometry and quantum optics exploiting free-electron lasers

Gabriel Aeppli

X-ray free-electron lasers (FELs) deliver ultrabright X-ray pulses, but not the sequences of phase-coherent pulses required for time-domain interferometry and control of quantum states. For conventional split-and-delay schemes to produce such sequences, th ...

National Academy of Sciences2022

Proof-of-concept analytical instrument for label-free optical deconvolution of protein species in a mixture

Gabriel Aeppli

The adoption of process analytical technologies by the biopharmaceutical industry can reduce the cost of therapeutic drugs and facilitate investigation of new bioprocesses. Control of critical process parameters to retain critical product quality attribute ...

ELSEVIER2021