Concept
Geometric phase
Related publications (38)
Phonon Self-Energy Corrections: To Screen, or Not to Screen
First-principles calculations of phonons are often based on the adiabatic approximation and on Brillouinzone samplings that might not always be sufficient to capture the subtleties of Kohn anomalies. These shortcomings can be addressed through corrections ...
College Pk2023Gyrokinetic simulation of short wavelength ion temperature gradient instabilities in the ADITYA-U tokamak
Laurent Villard, Emmanuel Lanti
In this work, linear and nonlinear collisionless electrostatic simulation studies of the standard and short wavelength ion temperature gradient mode (SWITG) for experimental profiles and parameters of ADITYA-U tokamak are performed using the linear global ...
IOP Publishing Ltd2023Spin Evolution in the Born-Oppenheimer Approximation
Jean-Philippe Ansermet, François Reuse, Klaus Maschke
The first part of this article attempts to highlight in chronological order some prominent papers that have direct connexion with the Born-Oppenheimer approximation. This timeline successively points to the role of level crossing, the notions of gauge fiel ...
WILEY-V C H VERLAG GMBH2022Reentrant magic-angle phenomena in twisted bilayer graphene in integer magnetic fluxes
In this Letter we address the reentrance of magic-angle phenomena (band flatness and quantum-geometric transport) in twisted bilayer graphene (TBG) subjected to strong magnetic fluxes +/-(1)0, +/- 200, +/- 3(p0 ... ((D0 = h/e is the flux quantum per moire ...
AMER PHYSICAL SOC2022Effect of collisions on non-adiabatic electron dynamics in ITG-driven microturbulence
Stephan Brunner, Justin Richard Ball
Non-adiabatic electron response leads to significant changes in ion temperature gradient (ITG) eigenmodes, leading, in particular, to fine-structures that are significantly extended along the magnetic field lines at corresponding mode rational surfaces (MR ...
AIP Publishing2021Simultaneous Perturbation Stochastic Approximation of the Quantum Fisher Information
Giuseppe Carleo, Julien Sebastian Gacon, Stefan Woerner
The Quantum Fisher Information matrix (QFIM) is a central metric in promising algorithms, such as Quantum Natural Gradient Descent and Variational Quantum Imaginary Time Evolution. Computing the full QFIM for a model with d parameters, however, is computat ...
VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF2021Which form of the molecular Hamiltonian is the most suitable for simulating the nonadiabatic quantum dynamics at a conical intersection?
Choosing an appropriate representation of the molecular Hamiltonian is one of the challenges faced by simulations of the nonadiabatic quantum dynamics around a conical intersection. The adiabatic, exact quasidiabatic, and strictly diabatic representations ...
2020Nonlinear gyrokinetic PIC simulations in stellarators with the code EUTERPE
Laurent Villard, Eduardo Sanchez, Alberto Bottino
In this work, the first nonlinear particle-in-cell simulations carried out in a stellarator with the global gyrokinetic code EUTERPE using adiabatic electrons and realistic plasma parameters are reported. Several studies are conducted with the aim of enabl ...
CAMBRIDGE UNIV PRESS2020Silicon Photonic MEMS Phase-Shifter
Niels Quack, Hamed Sattari, Teodoro Graziosi
We present a design for an analog phase shifter based on Silicon Photonic MEMS technology. The operation principle is based on a two-step parallel plate electrostatic actuation mechanism to bring a vertically movable suspended tapered waveguide in a first ...
2019Improved off‐resonance phase behavior using a phase‐inverted adiabatic half‐passage pulse for 13 C MRS in humans at 7 T
Rolf Gruetter, Lijing Xin, Daniel Gallichan, Eulalia Serés Roig
In vivo (13) C MRS at high field benefits from an improved SNR and spectral resolution especially when using surface coils in combination with adiabatic pulses, such as the adiabatic half-passage (AHP) pulse for (13) C excitation. However, the excitation p ...
2019