April 2017 - Vip-all.phys - maillist.au.dk

[vip-all] Talents
by Ulrik Ingerslev Uggerhøj 21 Jun '18

21 Jun '18

Dear all, As a follow-up for the residential meeting at Vejle, before which I only had response from 2 groups, I kindly ask you to - groupwise, if possible - inform me in writing about your planned activities in connection with talent students: "Please also take responsibility for organizing suggestions for host groups for “Talent students” (i.e. students being admitted to the talent program from their second year); such groups may consist of the entire topical group or one or more subgroups." Please include in your (preferably brief) response which (sub-)groups you suggest, 5-10 keywords about the scientific content, and a bit about which competencies you expect the talent students may obtain from your programme (both the 'soft' such as presentation skills, and the 'hard' such as programming in LabVIEW), and a suggestion for the final evaluation, to be done at the end of the 1/2 year (which product?). Mvh. Ulrik ************ Ulrik I. Uggerhøj Department of Physics and Astronomy Aarhus University Ny Munkegade 120 DK-8000 Aarhus Denmark Mobile: +45 2338 2373 e-mail: ulrik(a)phys.au.dk

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[vip-all] AMO seminar Wednesday April 26
by Grete Flarup 24 Apr '17

24 Apr '17

AMO seminar - Sebastian Hofferberth: Free-space QED with a single Rydberg superatom Dato: ons 26 apr Tid: 14:15 - 15:00 Sted: 1520-737 Abstract: Mapping the strong interaction between Rydberg excitations in ultracold atomic ensembles onto single photons enables the realization of optical nonlinearities which can modify light on the level of individual photons. This novel approach forms the basis of a growing Rydberg quantum optics toolbox, which already contains photonic logic building-blocks such as single-photon sources, switches, transistors, and conditional pi-phase shifts. Here, we discuss our recent experiments coupling an optical medium smaller than a single Rydberg blockade volume to a few-photon probe field. Due to the large number of atoms in the blockaded volume and the efficient coupling to the probe light mode, we achieve coherent coupling between the probe field and the effective Rydberg "superatom" even if the probe pulse contains only a few photons. This enables us to study the dynamics of a single two-level system strongly coupled to a quantized propagating light field in free space. Furthermore, by controlling the dephasing between the internal degrees of freedom of the superatom, we realize a free-space single-photon absorber, which deterministically absorbs exactly one photon from an input pulse. We show that this system can be used for the subtraction of one photon from the input pulse over a wide range of input photon numbers. Coffee/tea and cake from 14:00 Thomas Pohl

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[vip-all] Projekter i "Bølger og Optik" forår 2017
by Ann-Berit Porse Stærkær 19 Apr '17

19 Apr '17

Kære alle. (English summary below) Førsteårskurset "Bølger og optik" afsluttes med et to-ugers projektforløb (i uge 20 og 21, dvs. i perioden 15/5-26/5). I disse to uger aflyses al fysikundervisning, således at de studerende har 1/3 af deres tid til rådighed til at gennemføre et teoretisk eller eksperimentelt projekt og skrive en rapport og et resume', som indgår ved den mundtlige eksamen. Projekterne skal i bred forstand falde indenfor emnet "Bølger og optik", og de udbydes af JER. Der er instruktorer til rådighed til at assistere de studerende med den praktiske gennemførsel af projekter, hvis det er aktuelt. For at give dig en ide' om, hvad et sådant projekt kan indebære, vedlægger jeg sidste års projektkatalog. Jeg håber, at du har lyst til at bidrage til denne væsentlige og motiverende del af kurset, og ser frem til at høre fra dig i løbet af den næste uges tid. Glem ikke, at dette er det perfekte udstillingsvindue, hvor du viser de kommende bachelor, speciale og ph.d.-studerende, hvad der foregår i din gruppe! Svar gerne senest 29/4. Hilsen Liv. English summary: Dear Colleague. The first year course in "Waves and Optics" end with a two week project. Please consider to give a smaller group of first-year students the possibility of undertaking this activity - a small theoretical or experimental project - in your research group. The topic should be within "Waves and optics" in a general sense. The enclosed note (in Danish) shows last years list of topics. The period in question is calendar weeks 20 and 21 (May 15th-26th), and the total effort you may expect from the students is 1/3 of their time, i.e. something like 30 hours total, including the writing of a report. I hope you will be willing to contribute. Please reply - preferably before April 29th. If you are unsure how much work this entails on your part, then please come by or send me an e-mail. Best, Liv. -------------------------------------------- Liv Hornekær Associate Professor Dept. Physics and Astronomy and Interdisciplinary Nanoscience Center (iNANO) Aarhus University Denmark Email: liv(a)phys.au.dk<mailto:liv@phys.au.dk> Phone. +45 6166 3133 --------------------------------------------

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[vip-all] Theotical Physics Seminar - Karen Hovhannisyan
by Grete Flarup 18 Apr '17

18 Apr '17

Speaker: Karen Hovhannisyan, IFA Time: Thursday, 20 April, 15:15-16:00 Place: 1520-732 Title: "Low-temperature thermometry in many-body systems" Abstract: We consider the problem of estimating the temperature of a very cold equilibrium sample with an individual quantum probe in the regime of strong probe-sample interaction. It is well-known that, in the weak coupling regime, thermometry at low temperatures is inefficient exponentially with the inverse of the temperature. We show that the same holds for probes interacting with many-body samples with arbitrary strength provided that the interactions are of short range and the overall system is out of criticality. In the search for efficient low-temperature thermometry we are thus forced to turn to gapless and possibly long-range interacting many-body systems. To this end, we prove that a wide class of gapless translationally invariant one-dimensional harmonic lattices with arbitrary interactions is equivalent to the Caldeira-Leggett model with Ohmic spectral density, when viewed from the perspective of a single lattice site. This allows us to use the powerful analytical tools developed for the Caldeira-Leggett model and show, among other things, that in critical systems one can beat the exponential suppression of the temperature estimation and achieve precision only polynomially decaying with the inverse temperature. Alberto Imparato and Klaus Mølmer There will be tea, coffee and cake from 15:00.

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[vip-all] REMINDER: DHL 2017 tilmelding/DHL 2017 registration
by Ann-Berit Porse Stærkær 18 Apr '17

18 Apr '17

English version below DHL Stafet torsdag den 17 august 2017. Som tidligere år er PS! og FFB sammen om et telt for IFA hold. Der vil være øl og pølser til alle deltagere. Vi tilmelder holdene via AU, så der skal ikke betales registreringsgebyr. Både ansatte og ph.d.-studerende kan tilmelde hold á 5 personer. Man får en løbe-T Shirt hvis man deltager for første gang. For at registrere et hold send venligst en e-mail til FFB (ffb(a)phys.au.dk<mailto:ffb@phys.au.dk>) indeholdende følgende oplysninger: * Holdnavn For hver af de fem løbere: * Navn * E-mail * Fødselsår * Køn * T-shirt størrelse* (for dem der løber DHL stafet for første gang) * Løbernes rækkefølge Og: * Markér navnet og tilføj 'hjælper' for én af jer - (se nedenfor) Arrangørerne vil sætte pris på noget hjælp med nogle praktiske opgaver (f.eks. opsætning af teltet og transport af ting og sager til Mindeparken). Derfor vil vi gerne bede hvert hold stille med et medlem til at hjælpe. Vi vil holde et møde I begyndelsen af august, hvor vi uddeler opgaverne, så når du registrerer holdet, bedes du anføre navn og e-mail på den medarbejder, der vil hjælpe os. Fristen for tilmelding er mandag den 1. maj, men da folk har tendens til at registrere hurtigt, vil det være smart at handle hurtigt! Hvis der er enkeltpersoner, der ønsker at komme på et hold, kan de også sende en e-mail til arrangørerne (ffb(a)phys.au.dk<mailto:ffb@phys.au.dk>), og så vil vi prøve at finde nogle holdkammerater. For mere information om selve stafetten: http://www.aarhusmotion.dk/event/dhl-stafetten Yderligere information om arrangementet vil følge, når vi nærmer os dagen. *Du kan finde størrelsesguide for løbetrøjerne her: Herrer: http://medarbejdere.au.dk/fileadmin/www.medarbejdere.au.dk/DHL/Stoerrelsesg… Damer: http://medarbejdere.au.dk/fileadmin/www.medarbejdere.au.dk/DHL/Stoerrelsesg… Mvh. PS! og FFB ........................................................................................ DHL 5 km relay race 2017. Race day: Thursday 17th August 2017. As in previous years we will host a PS! / FFB tent for teams from IFA, with beer and sausages for all participants. Following the procedure from last year, we will be registering the teams via AU, so there will be no registration fee to pay Both PhD students and staff can register teams of 5 participants. A running Tshirt is given to those who participate for the first time. To register your team please send an email to FFB (ffb(a)phys.au.dk<mailto:ffb@phys.au.dk>) including * The team name For each of the five runners: * Name * Email address * Birth year * Gender * T-shirt size required* (only if you run the DHL relay for the first time) * The order in which they will run. And: * Mark up the name and add 'helper' for one of you - (see below) The organisers would appreciate some help with some practical tasks for the event (for example, setting up the tent and transporting items to Mindeparken). Therefore we would like to ask one member of each team to assist. We will hold a meeting in early August to distribute tasks, so please include the name and email address of the team member who will help in the email to the organisers when you register. The strict deadline for registering is Monday, May 1st, but as people tend to register quickly it would be smart to act fast! Individuals who want to be on a team can also send an email to the organisers (ffb(a)phys.au.dk<mailto:ffb@phys.au.dk>) and we will try to find some teammates. For more information on the relay race: http://www.aarhusmotion.dk/event/dhl-stafetten Further information on the arrangement will follow as we get closer to the day. *You can find size guides for the running shirts here: Men: http://medarbejdere.au.dk/fileadmin/www.medarbejdere.au.dk/DHL/Stoerrelsesg… Women: http://medarbejdere.au.dk/fileadmin/www.medarbejdere.au.dk/DHL/Stoerrelsesg… Sincerely, PS! and FFB

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