December 2013 - Vip-all.phys

[vip-all] Indbydelse til tiltrædelsesforelæsning/Invitation to inaugural lecture
by Ruth Laursen 23 Dec '13

23 Dec '13

I anledning af at Hans Kjeldsen den 1. december 2013 er udnævnt til professor i observationel asteroseismologi og exoplanetforskning ved Institut for Fysik og Astronomi , inviterer vi til tiltrædelsesforelæsning og efterfølgende reception den 8. januar 2014. Venlig hilsen På instituttets vegne Ruth Laursen ******************************* Ruth Laursen Head of Department Secretariat Department of Physics and Astronomy Aarhus University Ny Munkegade 120 8000 Aarhus C Denmark e-mail: ruth(a)phys.au.dk<mailto:ruth@phys.au.dk> Office: 1522-212 Mobile: + 45 2338 2335 Telephone: +45 8715 5652

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[vip-all] Opdatering om bygningsrenovering af 1525 / Update on renovation of 1525
by Ruth Laursen 18 Dec '13

18 Dec '13

Til alle medarbejdere og studerende ved IFA. Bygningsrenoveringen af 1525 går lige straks over i næste fase. Det betyder, at i første omgang 4. etage (i denne uge) og senere 3. etage (i slutningen af februar) bliver klar til genindflytning. Til gengæld bliver 1525-2.etage spærret med udgangen af denne uge. Adgangen til Fysisk Auditorium (1523-318) vil i en overgangsperiode være besværliggjort af, at både 2. og 3. etage er spærret; adgang kan ske gennem værkstedet på 1. etage. Eller gennem døren i gavlen af bygning 1523 (etage 1). Adgang gennem 3. etage bliver genoprettet ultimo februar. Adgang til laboratorierne i 1526 vil kunne ske ad trappen i den nordlige ende af bygning 1525. Enten via 4. og 5. etage eller via etage 0. Går du via etage 0, så følg skiltningen fra 1520-1. etage (Informationen) Vi håber på jeres fortsatte forståelse for de besværligheder renoveringen giver. MVH Anders Damgaard For all employees and students at IFA The renovation of building 1525 will soon move into the second phase. This means that this week the 4th floor will be ready for moving back in, and at the end of February the 3rd floor will be ready. However, the 2nd floor will be blocked off by the end of this week. During a transitional time period the access to Fysisk Auditorium (1523-318) will be complicated, since the 2nd and the 3rd floors are blocked. Access is possible through the workshop on the 1st floor or through the door at the far end of building 1523 (1st floor). Access through the 3rd floor will be re-established at the end of February. Access to the labs in building 1526 will be possible through the staircase at the northward end of building 1525 - either through the 4th, the 5th or the ground floor. When accessing through the ground floor, please follow the signposting from building 1520, 1st floor (Information desk). We hope to have your continued understanding for any difficulties the renovation may give. Best regards Anders Damgaard ******************************* Ruth Laursen Head of Department Administration Department of Physics and Astronomy Aarhus University Ny Munkegade 120 8000 Aarhus C Denmark e-mail: ruth(a)phys.au.dk Office: 1522-212 Mobile: + 45 2338 2335 Telephone: +45 8715 5652

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[vip-all] Vigtigt - Besøg fra Arbejdstilsynet
by Poul Erik Hessellund Eriksen 18 Dec '13

18 Dec '13

Kære alle, Arbejdstilsynet har varslet at de vil komme på rutinemæssigt besøg på IFA (og 42 andre steder på Universitetet) indenfor de kommende 3 måneder. Tilsynet vil normalt begynde med et møde med en arbejdsleder (Ruth og Lars) og en arbejdsmiljørepræsentant (Poul Erik), hvor arbejdsmiljøet drøftes og dokumentation (APV, handlingsplaner osv.) fremvises. Herefter besigtiges arbejdsmiljøet ved en rundgang og medarbejdere spørges til deres fysiske og psykiske arbejdsmiljø. De tilsynsførende har ret til adgang til hele IFA og til at tale med alle medarbejdere. I den forbindelse vil jeg gøre opmærksom på at ALLE medarbejdere skal kende (eller vide hvor de kan finde) flg. oplysninger: 1. Hvem er dine arbejdsmiljørepræsentanter (ledelses- og medarbejder repræsentant)? 2. Hvilken arbejdsmiljøgruppe hører du til? 3. Hvor findes handleplaner for Fysisk APV? 4. Hvor findes handleplaner for Psykisk APV? 5. Hvor findes den Årlige arbejdsmiljødrøftelse? Alle informationer kan findes på vores hjemmeside under Arbejdsmiljø og sikkerhed<http://phys.medarbejdere.au.dk/arbejdsmiljoe-og-sikkerhed/> Der er desuden ophængt planer over IFA's arbejdsmiljøorganisation og arbejdsmiljøgrupper ved indgangsdørene på alle etager. Jeg vil samtidig bede jer være opmærksomme på de arbejdsmiljømæssige forhold generelt og kontakte mig hurtigst muligt, hvis I ser ting I mener, der bør ændres. Med venlig hilsen Poul Erik Eriksen Formand for arbejdsmiljøudvalget Daglig arbejdsmiljøleder Institut for Fysik og Astronomi Email: pehe(a)phys.au.dk<mailto:pehe@phys.au.dk> Tlf.: 2338 2091 Kontor: 1520-331

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[vip-all] IFA-nyt, uge 51 / IFA News, week 51
by Mette Alstrup Lie 16 Dec '13

16 Dec '13

Læs følgende nyheder for uge 51: Grønne magneter i ASTRID2<http://scitech.au.dk/aktuelt/nyheder/vis/artikel/groenne-magneter-i-astrid2…> Forskere har i samarbejde med virksomheder udviklet permanente magneter, der kan erstatte de energikrævende elektromagneter, man i dag bruger i f.eks. acceleratorer til forskning med røntgenstråling og til datering af arkæologiske prøver. For nylig har accelaratoren ASTRID2 på Institut for Fysik og Astronomi fået udskiftet en energislugende elektromagnet med en ’grøn’ magnet. Uranspøgelset fra Den Kolde Krig<http://scitech.au.dk/roemer/dec13/uranspoegelset-fra-den-kolde-krig/> Udvinding af uran i Grønlands undergrund er højaktuel i denne tid. Men vi skal godt 60 år tilbage i tiden for at finde begyndelsen på uranjagten, der bar præg af spændingerne under Den Kolde Krig. Det viser et omfattende forskningsprojekt ledet af Aarhus Universitet, der for første gang sætter fokus på amerikanske og danske forskningsaktiviteter i Grønland efter Anden Verdenskrig. Indkaldelse af forslag til ÅRETS TEMA 2014. Vi indkalder forslag for 2014 til ÅRETS TEMA for IFA, og da vi gerne vil afsløre vinderen ved vores institutarrangement den 19. december, skal vi bede om at alle forslag er os i hænde senest den 18. december om morgenen. For at sikre, at temaet bevarer sin synlighed igennem 2014, vil vi gerne bede om, at man supplerer sit forslag til emne med konkrete forslag til, hvordan vi holder emnet i fokus hele året. Som vi har diskuteret i Institutforum, kan det være forslag til løbende begivenheder eller aktiviteter, som sætter årets tema på dagsordenen. Ferieoversigt Fra den 2. december kan alle medarbejdere på mit.au.dk<https://mit.au.dk/> se en oversigt over deres ferie. Det betyder bl.a., at den enkelte medarbejder ikke længere behøver bede sin fraværsadministrator om hjælp for at kunne se en oversigt over sin restferie. http://medarbejdere.au.dk/administration/hr/hr-systemer/auhra/vejledninger/… Alle kantiner er lukkede mandag den 23. december Både Fysisk, Matematisk og Kemisk Kantine holder lukket på mandag. Husk derfor madpakken, hvis du er på arbejde den dag. Opslag · Alle opslag.<http://phys.medarbejdere.au.dk/opslag/> · Informationsmøde om Excellence – fokus på European Research Council (ERC) og Marie Sklodowska-Curie Actions (MSCA) onsdag den 15. januar 2014.<http://phys.medarbejdere.au.dk/fileadmin/site_files/intern/Informationsmoed…> Tilmeldingsfrist senest 8. januar 2014. · Noter om Horizon 2020.<http://phys.medarbejdere.au.dk/fileadmin/site_files/intern/H2020_041213.pdf> Ledige stillinger ved instituttet Se alle ledige stillinger ved Institut for Fysik og Astronomi.<http://phys.au.dk/aktuelt/ledige-stillinger/> Nyhedsbreve · Nyhedsbrev fra Universitetsledelsen nr. 42/2013<http://www.au.dk/om/uni/universitetsledelsen/nyhedsbrevuniled/2013/42/>. IFA-nyt ønsker alle en god jul! __________ IFA News, week 51 ‘Green’ magnets in ASTRID2<http://scitech.au.dk/en/current-affairs/news/show/artikel/groenne-magneter-…> Researchers collaborated with companies to develop permanent magnets that can replace the energy-intensive electromagnets currently used in accelerators for research using X-rays and for dating archaeological samples. The ASTRID2 accelerator at the Department of Physics and Astronomy recently had one of its energy-guzzling electromagnets replaced with a ‘green’ magnet. Suggestions for the theme of the year 2014. We call in suggestions for the theme of the year for IFA 2014. Since we would like to announce the winner at our department event 19th December, please give your suggestions by 18th December in the morning. In order to keep the theme highlighted throughout 2014, please also give constructive suggestions as to how we can ensure this. As discussed in Institutforum, it could be events or activities which will bring focus to the theme throughout the year. Vacation overview As of December 2nd all employees will be able to see an overview of their vacation at mit.au.dk<https://mit.au.dk/>. Consequently, you won’t need secretarial help to see your remaining holidays. http://medarbejdere.au.dk/en/administration/hr/hr-systemer/auhra/vejledning… All canteens will be closed Monday 23rd December Both Fysisk, Matematisk and Kemisk Kantine will be closed on Monday. Therefore, don’t forget a packed lunch if you are working that day. Calls · All calls.<http://phys.medarbejdere.au.dk/en/calls/> · Information meeting about Excellence with focus on the European Research Council (ERC) and the Marie Sklodowska-Curie Actions (MSCA) Wednesday 15 January 2014.<http://phys.medarbejdere.au.dk/fileadmin/site_files/intern/Information_meet…> Registration at the latest by 8 January 2014. · Notes on Horizon 2020.<http://phys.medarbejdere.au.dk/fileadmin/site_files/intern/H2020_041213.pdf> Vacancies See all vacancies at the Department of Physics and Astronomy.<http://phys.au.dk/en/currently/vacancies/> Newsletters · News from the Senior Management Team No. 42/2013.<http://www.au.dk/en/about/uni/seniormanagement/newsletter/2013/42/> IFA News wishes everyone a Merry Christmas! Med venlig hilsen / Kind regards Mette Lie -- Mette Alstrup Lie Department of Physics and Astronomy Aarhus University Ny Munkegade 120 DK-8000 Aarhus C Denmark Office 1522-214 e-mail: lie(a)phys.au.dk<mailto:lie@phys.au.dk> Tel: +45 8715 5607 Mobile: +45 2165 4361

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[vip-all] Solid state physics seminar today at 13:15
by Kate Andersen 16 Dec '13

16 Dec '13

Solid state physics seminar Title: Ab-initio methods for topological insulators Speaker: Irene Aguilera, Forschungszentrum Jülich Time: Monday, 16th December at 13:15 Place: 1520-732 Abstract: In topological insulators, the spin-orbit interaction leads to a band inversion and to nontrivial edge or surface states, which reside in the energy gap of the bulk material and are protected by time-reversal symmetry. Most of the ab-initio calculations present in the literature for these materials are carried out within density-functional theory (DFT) employing the local-density (LDA) or generalized gradient approximation (GGA), which can describe the ground-state properties accurately but are not appropriate for band gaps and excited-state properties, such as the quasiparticle energies. To overcome this problem, one can use the GW and quasiparticle self-consistent GW (QSGW) approximations to calculate quasiparticle corrections for the electronic states. This yields results that are directly comparable with photoemission spectroscopy measurements. I will introduce these approaches and discuss the importance of the spin-orbit coupling (SOC) being fully taken into account, instead of being added a posteriori, as in most GW calculations in the literature. We have performed GW calculations for bulk Bi2Se3, Bi2Te3, and Sb2Te3 [1-3], and mercury chalcogenides [4], within the all-electron FLAPW formalism [www.flapw.de<http://www.flapw.de/>]. Results are in better agreement with experiments than the LDA ones [3-4]. We have also applied the QSGW method to bismuth and HgTe. Bismuth is a topologically trivial semimetal, which presents small electron and hole pockets and a tiny band gap at the L point (11-15 meV), largely overestimated by LDA (86 meV). Our QSGW calculation predicts a value of the band gap of 8 meV and the overlap between the electron and hole pockets in very good agreement with experiments. We also show that spin-orbit coupling has to be fully taken into account in QSGW in order to obtain physical results for Bi and HgTe. For bismuth, the most widely used "a-posteriori" treatment of SOC predicts it to be a topological insulator with a too large gap at L (260 meV), instead of a trivial semimetal. For HgTe, this treatment of SOC produces unphysical results, reordering the bands in a wrong way and opening a gap at the Gamma point in complete disagreement with experiments. We show that, in contrast, when QSGW calculations are performed taking fully into account SOC, results for HgTe and Bi are qualitatively and quantitatively in very good agreement with experiments. In view of these results, we also use the QSGW approach to study the trivial-to-topological transition that bulk bismuth experiences under strain. [1] I. Aguilera, C. Friedrich, G. Bihlmayer, and S. Blügel, Phys. Rev. B 88, 045206 (2013) [2] I. Aguilera, C. Friedrich, S. Blügel, Phys. Rev. B 88, 165136 (2013) [3] I. A. Nechaev et al., Phys. Rev. B 87, 121111 (2013) [4] R. Sakuma, C. Friedrich, T. Miyake, S. Blügel, and F. Aryasetiawan, Phys. Rev. B, 84, 085144 (2011) Philip Hofmann, iNANO & Department of Physics and Astronomy

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[vip-all] SPR hjælp i 2013
by Helge Knudsen 13 Dec '13

13 Dec '13

Kære kollega, I disse økonomisk stramme tider vil fakultetet gerne have en liste over hvor mange Studieretningsprojekter (SRP) vi har hjulpet med I 2013. Vi du udfylde følgene for dig (og dine studenter): Emne: Antal gymnasieelver: Emne: Antal gymnasieelver: Og sende denne e-mail tilbage til mig? ..... Gerne nu. Mange tak! Helge Helge Knudsen Prof. (lektor msk) Department of Physics and Astronomy, Aarhus University Ny Munkegade 120, DK-8000, Aarhus C, Denmark Office: +45 8715 5596 Cell: +45 2338 2411 [IFA logo blue small]

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[vip-all] i DAG: Sidste frist for tilmelding til institutarrangement 19.12
by Ruth Laursen 12 Dec '13

12 Dec '13

Vh ruth ******************************* Ruth Laursen Head of Department Administration Department of Physics and Astronomy Aarhus University Ny Munkegade 120 8000 Aarhus C Denmark e-mail: ruth(a)phys.au.dk Office: 1522-212 Mobile: + 45 2338 2335 Telephone: +45 8715 5652

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[vip-all] HUSK: General Physics today
by Ruth Laursen 11 Dec '13

11 Dec '13

http://phys.au.dk/aktuelt/nyhed/artikel/general-physics-colloquium-nirit-du… ******************************* Ruth Laursen Head of Department Administration Department of Physics and Astronomy Aarhus University Ny Munkegade 120 8000 Aarhus C Denmark e-mail: ruth(a)phys.au.dk Office: 1522-212 Mobile: + 45 2338 2335 Telephone: +45 8715 5652

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[vip-all] Remember General Physics Colloquium at 15.15: Nirit Dudovich.
by Mette Alstrup Lie 11 Dec '13

11 Dec '13

General Physics Colloquium 'Resolving and manipulating attosecond processes via strong-field light-matter interactions' Nirit Dudovich Weizmann Institute of Science, Rehovot The interaction of intense light with atoms or molecules can lead to the generation of extreme ultraviolet (XUV) pulses and energetic electron pulses of attosecond (10-18) duration. The advent of attosecond technology opens up new fields of time-resolved studies in which transient electronic dynamics can be studied with a temporal resolution that was previously unattainable. I will review the main challenges and goals in the field of attosecond science. As an example, I will focus on a recent experiment where the dynamics of tunnel ionization - one of the most fundamental strong-field phenomena - were studied. Specifically, we were able to measure the times when different electron trajectories exit from under the tunneling barrier created by a laser field and the atomic binding potential. In the following stage, subtle delays in ionization times from two orbitals in a molecular system were resolved. This experiment provides an additional, important step towards achieving the ability to resolve multielectron phenomena -- a long-term goal of attosecond studies. In the next part of my talk I will describe how we can proceed directly from measurement to control. In this study we link the generation process of attosecond pulses to the field of caustics - a unique type of singularity that is common to all wave phenomena. We demonstrated that caustics can appear in attosecond processes and showed that they offer a deeper understanding of the basic mechanism. Coffee/tea and cake will be served at 3 PM.

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[vip-all] Molecular Physics Seminar today
by Grete Flarup 11 Dec '13

11 Dec '13

Molecular Physics Seminar Title: Imaging the Three-Body Wavefunction of Fragmenting Triatomic Hydrogen Speaker: Steffen Meyer Albert-Ludwigs-Universität Freiburg, Germany Time: Wednesday, December 11 at 13:15 Place: 1520-732 Abstract: Neutral triatomic hydrogen is the most simple polyatomic molecule, and a prototype of molecular degrees of freedom, of molecular interaction and of nonadiabatic couplings in particular. I will begin my presentation by outlining fundamental properties of this molecule and then concentrate on my current research theme and experiment in Freiburg where I study three-body fragmentation of electronically excited states of H3. My specific interest is in states with principal quantum number n = 4 which I excite using a narrowband tunable diode laser in a keV neutral beam. The excited states decay primarily by predissociation into the continuum of three neutral H atoms. Time- and position-sensitive detectors allow to record in coincidence the three slow (≈ 1 eV) neutral ground state hydrogen atoms which emerge in predissociation. Coincident detection of the three correlated atoms from a single molecule permits to reconstruct the centre-of-mass momentum vectors of the three hydrogen atoms. This experiment, when repeated for many molecules (typically 104) delivers a map of momentum correlation of the three H atoms. This momentum correlation map may be regarded as an image of the modulus squared of the three-body wavefunction, at the time when the system emerges from molecular distances. As the bound state heavy-particle wavefunction is known, the observed distribution is a measure of the phase-space dependent action of nonadiabatic coupling which allows the bound state to exit into the continuum. Coffee/tea will be served at 13:05

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