Publications associées à Bose gas

Microscopy of Cavity-Induced Density-Wave Ordering in Ultracold Gases

We demonstrate high-resolution in situ imaging of density-wave ordering induced by cavity-mediated interactions in a unitary Fermi gas. We observe long-range spatial correlations throughout the formation of density waves, both for adiabatic preparation and following a quench, with a pattern controlled by the cavity mode structure. Our single-shot microscopic images together with the real-time readout of the cavity photons provide access to atom-photon correlations. We use this capability to investigate orde

2026

Cavity-mediated charge and pair-density waves in a unitary Fermi gas

Coherent light-matter interactions between a quantum gas and light in a high-finesse cavity can drive self-ordering phase transitions. To date, such phenomena have involved exclusively single-atom coupling to light, resulting in coupled charge-density or spin-density wave and superradiant order. In this work, we engineer simultaneous coupling of cavity photons to both single atoms and fermionic pairs, which are also mutually coupled due to strong correlations in the unitary Fermi gas. This interplay gives r

Springer Science and Business Media LLC2025

A Novel Understanding of the Role of Plasma-molecular Kinetics on Divertor Power Exhaust

Holger Reimerdes

During detachment, a buffer of neutral atoms and molecules builds up between the target and the ionising plasma. Collisions between the plasma and the molecules play an important role in the detachment process. Studies of plasma-molecular kinetics indicate that the gas temperature increases during deepening detachment for a wide range of conditions on the MAST-U and TCV tokamaks. This is related to an increased D2 lifetime during detachment, leading to more plasma-molecule collisions that raise the molecula

IOP Publishing Ltd2025

Design and assembly of a cavity-microscope system for cold atoms experiments

In this thesis, we describe the implementation of a cavity-microscope system for cold atoms experiments. This technology combines a high-finesse optical resonator and a high-resolution imaging system. Stability and alignment are crucial aspects of the setup. A cavity holder has been specifically designed to answer the mechanical demands of the cavity-microscope, ensuring its stability. Furthermore, an assembly and alignment procedure has been carefully planned to bring together the bare optical and mechanic

École Polytechnique Fédérale de Lausanne2023

Breakdown of the Wiedemann-Franz law in a unitary Fermi gas

Jean-Philippe Brantut

We report on coupled heat and particle transport measurements through a quantum point contact (QPC) connecting two reservoirs of resonantly interacting, finite temperature Fermi gases. After heating one of them, we observe a particle current flowing from c ...

National Academy of Sciences2018

Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at root s=7 TeV

Olivier Schneider, Yiming Li, Aurelio Bay, Guido Haefeli, Christoph Frei, Frédéric Blanc, Tatsuya Nakada, Michel De Cian, Luca Pescatore, François Fleuret, Elena Graverini, Renato Quagliani, Aravindhan Venkateswaran, Vitalii Lisovskyi, Jian Wang, Zhirui Xu, Yi Zhang, Lei Zhang, Jessica Prisciandaro, Mark Tobin, Minh Tâm Tran, Greig Alan Cowan, Maurizio Martinelli, Vladislav Balagura, Donal Patrick Hill, Liang Sun, Pietro Marino, Mirco Dorigo, Jean Wicht, Sebastiana Gianì, Liupan An, Federico Leo Redi, Ilya Komarov, Plamen Hristov Hopchev, Maxime Schubiger, Hang Yin, Guido Andreassi, Violaine Bellée, Olivier Göran Girard, Axel Kuonen, Preema Rennee Pais, Pavol Stefko, Maria Elena Stramaglia, Tommaso Colombo, Vladimir Macko

Bose-Einstein correlations of same-sign charged pions, produced in proton-proton collisions at a 7TeV centre-of-mass energy, are studied using a data sample collected by the LHCb experiment. The signature for Bose-Einstein correlations is observed in the f ...

Springer Nature2017

Bosonic lasing and trapping of a dressed photon fluid in InGaN at room temperature

Munise Nevin Cobet

The generation of a quantum fluid of dressed photons at room temperature is experimentally demonstrated in an InGaN microcavity which is divided into two-and one-dimensional sections, resulting in single- and switchable multilevel coherent light emission. ...

Amer Physical Soc2016

Towards pre-dimensioning of natural gas networks on a web-platform

Gaëtan Cherix

The MEU GIS-enabled web-platform has been developed in close collaboration with four Swiss cities: it enables detailed monitoring and planning for both energy demand and supply at individual building and neighborhood level (http://meu.epfl.ch). This web-platform gives access to entire cities comprising several thousands of buildings. In its actual configuration, this tool does not allow to pre-design networks depending on the energy demand of existing or futures infrastructures. Indeed, in MEU, gas networks

2015

Distinction of Nuclear Spin States with the Scanning Tunneling Microscope

Harald Brune, François Patthey

We demonstrate rotational excitation spectroscopy with the scanning tunneling microscope for physisorbed H-2 and its isotopes HD and D-2. The observed excitation energies are very close to the gas phase values and show the expected scaling with the moment of inertia. Since these energies are characteristic for the molecular nuclear spin states we are able to identify the para and ortho species of hydrogen and deuterium, respectively. We thereby demonstrate nuclear spin sensitivity with unprecedented spatial

Amer Physical Soc2013

The Error in Gas Temperature Measurements with Thermocouples: Application on an SOFC System Heat Exchanger

Daniel Favrat, Jan Van Herle

Aim of this work is to model and study the behavior of thermocouples as they are used in the measurement of gas temperatures in solid oxide fuel cell systems. Due to the high temperature regime in such systems, the effect of radiation and conduction from surrounding solids may bias the measurements with important consequences on control, performance, and cell durability. In order to study these effects a mathematical model of a working thermocouple was developed and it was integrated in that of a heat excha

2012

Bose gas

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