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Gabriel Aeppli

Cette personne a quitté l’EPFL

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Publications associées (42)

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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

Anomalous electrons in a metallic kagome ferromagnet

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

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

Load-induced dynamical transitions at graphene interfaces

Gabriel Aeppli

The structural superlubricity (SSL), a state of near-zero friction between two contacted solid surfaces, has been attracting rapidly increasing research interest since itwas realized in microscale graphite in 2012. An obvious question concerns the implicat ...

National Academy of Sciences2020

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

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

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

Gabriel Aeppli

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

Hidden, entangled and resonating order

Henrik Moodysson Rønnow, Gabriel Aeppli

In condensed matter systems, the atoms, electrons or spins can sometimes arrange themselves in ways that result in unexpected properties but that cannot be detected by conventional experimental probes. Several historical and contemporary examples of such h ...

NATURE PUBLISHING GROUP2020

Fast diffusion of water nanodroplets on graphene

Gabriel Aeppli, Gabriele Tocci

Diffusion across surfaces generally involves motion on a vibrating but otherwise stationary substrate. Here, using molecular dynamics, we show that a layered material such as graphene opens up a new mechanism for surface diffusion whereby adsorbates are ca ...

Nature Publishing Group2016

Dipolar Antiferromagnetism and Quantum Criticality in LiErF4

Henrik Moodysson Rønnow, Gabriel Aeppli, Julian Piatek, Bastien Dalla Piazza, Neda Nikseresht Ghanepour, Nikolay Tsyrulin

Magnetism has been predicted to occur in systems in which dipolar interactions dominate exchange. We present neutron scattering, specific heat, and magnetic susceptibility data for LiErF4, establishing it as a model dipolar-coupled antiferromagnet with pla ...

American Association for the Advancement of Science2012

Testing of asymptomatic individuals for fast feedback-control of COVID-19 pandemic

Gabriel Aeppli

We argue that frequent sampling of the fraction ofa priorinon-symptomatic but infectious humans (either by random or cohort testing) significantly improves the management of the COVID-19 pandemic, when compared to intervention strategies relying on data fr ...

2020

Two- to three-dimensional crossover in a dense electron liquid in silicon

Gabriel Aeppli

Doping of silicon via phosphine exposures alternating with molecular beam epitaxy overgrowth is a path to Si:P substrates for conventional microelectronics and quantum information technologies. The technique also provides a well-controlledmaterial for syst ...

AMER PHYSICAL SOC2018

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

Nanoscale imaging of mobile carriers and trapped charges in delta doped silicon p-n junctions

Gabriel Aeppli

Broadband electrostatic force microscopy can be used to non-destructively image n-type and p-type dopant layers in silicon devices with a lateral resolution of 10 nm and a vertical resolution of 0.5 nm. ...

NATURE PUBLISHING GROUP2020

Interacting Dirac materials

Gabriel Aeppli

We investigate the extent to which the class of Dirac materials in two-dimensions provides general statements about the behavior of both fermionic and bosonic Dirac quasiparticles in the interacting regime. For both quasiparticle types, we find common feat ...

2020

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

Taking advantage of multiplet structure for lineshape analysis in Fourier space

Gabriel Aeppli

Lineshape analysis is a recurrent and often computationally intensive task in optics, even more so for multiple peaks in the presence of noise. We demonstrate an algorithm which takes advantage of peak multiplicity (N) to retrieve line shape information. T ...

2020

Giant non-linear susceptibility of hydrogenic donors in silicon and germanium

Gabriel Aeppli

Implicit summation is a technique for the conversion of sums over intermediate states in multiphoton absorption and the high-order susceptibility in hydrogen into simple integrals. Here, we derive the equivalent technique for hydrogenic impurities in multi ...

Springer2019

Three-dimensional imaging of integrated circuits with macro- to nanoscale zoom

Gabriel Aeppli, Manuel Guizar Sicairos

The imaging of integrated circuits across different length scales is required for failure analysis, design validation and quality control. At present, such inspection is accomplished using a hierarchy of different probes, from optical microscopy on the mil ...

NATURE PUBLISHING GROUP2019

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

Antiferromagnetic fluctuations and charge carrier localization in ferromagnetic bilayer manganites: electrical resistivity scales exponentially with short-range order controlled by temperature and magnetic field

Gabriel Aeppli

The compound La2-2xSr1+2xMn2O7,x= 0.30-0.40, consists of bilayers of ferromagnetic metallic MnO(2)sheets that are separated by insulating layers. The materials show colossal magnetoresistance-a reduction in resistivity of up to two orders of magnitude in a ...

2020