Department of Physics

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Foto CERN
Foto CERN Study at the Department of Physics
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    Information for students and staff about the coronavirus

    The Swedish Public Health Agency has updated its risk assessment for spread of the corona virus. This is the policy for staff and students at the Department of Physics.

    This applies to Fysikum
    Sergey Koroidov, Researcher, The Department of Physics

    Conversion of carbon dioxide back into fuels

    The conversion of carbon dioxide back into fuels via electrochemistry is a very attractive alternative. - In my studies, I am developing the essential understanding of these reactions by following time-resolved transformation at the atomic and molecular level, says Sergey Koroidov.

    Conversion of carbon dioxide back into fuels
    Foto Ingmarie Andersson

    Information about courses given during autumn semester 2021

    The government and the public health authority have decided that the restrictions will be lifted on September 29 -2021. The president of Stockholm University has previously decided on a gradual return to campus teaching during the autumn semester (Dnr. SU- FV-1.1.2-1620-20). At the Department of Physics the format for teaching during the first half of the semester was decided June 4 -2021 (Dnr: SU-402-0072-21).

    Information about courses given during autumn semester 2021
    Optical Nano Cavities

    Enhancing photophysical processes in molecules with attosecond pulse trains

    Researchers at Fysikum have proposed a method, which uses ultrashort bursts of light, to gain deeper insight into complex photophysical processes of molecules occurring at femtosecond time scales. The proposed technique makes use of so-called attosecond pulse trains to track the motion of an excited molecule and its decay back to the ground state. During the measurement the molecule is ionized and the energy of the ejected electrons is recorded. The comb-like structure of the energy spectrum gives further insight into quantum mechanical processes that the excited molecules experiences.

    Enhancing photophysical processes in molecules with attosecond pulse trains
    Atomic Motion in Liquid Water Molecules

    Importance of Quantum Effects in Water

    Using ultrafast electron diffraction, Anders Nilsson at Stockholm University have participated in a study lead by colleagues at SLAC National Accelerator Laboratory in California on how the structure of water changes after a fast change in the quantum distribution of distances in the internal bond. Upon increasing the quantum number by one unit of the internal OH stretch the team surprisingly found that the hydrogen bond becomes strengthen. The finding is published this week in Nature.

    Importance of Quantum Effects in Water
    Photon energy image. Credit Davide Bossini

    Ultrafast light control of magnetism via the magnetoelastic effect

    "One of the most exciting and least understood properties of materials is the so-called magnetoelasticity." Researcher Stefano Bonetti from the Department of Physics reports on experiments carried out in collaboration with universities in Germany, Japan and Italy.

    Ultrafast light control of magnetism via the magnetoelastic effect
    Welcoming new students at fall 2021

    Welcome to Fysikum - The Department of Physics!

    During last week, we welcomed many new students to programs and courses at the Department of Physics. This year, the introductory meetings were given both on campus and remotely via zoom.

    Welcome to Fysikum - The Department of Physics!
    Suvasthika Indrajit

    Suvasthika Indrajith works in experimental physics with atomic and molecular ions at DESIREE

    - I started here in January as a post-doc and I won the thesis prize this year from the Chemistry-Physics Division of the French Chemical Society (SCF) and the French Society of Physic (SFP).

    Suvasthika Indrajith works in experimental physics with atomic and molecular ions at DESIREE
    David Degerman. Foto Niklas Björling

    Measuring the chemical and physical properties of molecules

    - I am a PhD student in Chemical Physics with a background in materials chemistry. My current research is on x-ray spectroscopy of thermal catalysts for CO and CO2 hydrogenation reactions. In short: me and my colleagues have built a new instrument (the technical term would be a "synchrotron endstation for high-pressure x-ray photoelectron spectroscopy") capable of measuring the chemical and physical properties of molecules involved in the reaction under more realistic reaction conditions, says David Degerman.

    Measuring the chemical and physical properties of molecules
    Sara Strandberg

    Measuring the Higgs boson

    All matter on Earth and in the universe is made up of elementary particles that have existed since just after the Big Bang. Wallenberg Scholar Sara Strandberg is studying how the particles interact with each other. She is using data from the LHC particle collider at CERN to learn more about the Higgs Boson and the part it plays in the Standard Model of particle physics.

    Measuring the Higgs boson
    Lars G.M. Pettersson

    Stockholm University receives four ERC Advanced Grants

    On 22 April the ERC announced the researchers who will receive Advanced Grants starting in 2021. There are 209 grantees from 14 European countries and seven grants go to Sweden. Four researchers work at the Stockholm University – making the university the most successful this year. Two of them work at the Department of Physics: Hiranya V. Peiris, Professor of Cosmoparticle Physics and Director of the Oskar Klein Centre and Lars G.M. Pettersson, Professor of Theoretical Chemical Physics.

     

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    Student som studerar vid dator. Ekvationer på tavla i bakgrunden.

    Information about form of teaching

    The government and the public health authority have decided that the restrictions will be lifted on September 29 -2021. The president of Stockholm University has previously decided on a gradual return to campus teaching during the autumn semester (Dnr. SU- FV-1.1.2-1620-20). At the Department of Physics the format for teaching during the first half of the semester was decided June 4 -2021 (Dnr: SU-402-0072-21).

    Information about form of teaching
    Foto Ingmarie Andersson

    Information about courses given during autumn semester 2021

    The government and the public health authority have decided that the restrictions will be lifted on September 29 -2021. The president of Stockholm University has previously decided on a gradual return to campus teaching during the autumn semester (Dnr. SU- FV-1.1.2-1620-20). At the Department of Physics the format for teaching during the first half of the semester was decided June 4 -2021 (Dnr: SU-402-0072-21).

    Information about courses given during autumn semester 2021
    The top part of the figure illustrates the system where pyrrole embedded inside an optical cavity. The bottom part represents the ground and excited state potential energy surfaces of pyrrole along NH dissociation.

    Optical nano cavities: a control knob for tuning photo-chemical reactions on a quantum level

    Researchers at Fysikum have theoretically investigated the light activated hydrogen abstraction reaction of pyrrole in an optical nano cavity. The electronic excitation of pyrrole with UV light triggers the hydrogen detachment reaction along the NH bond. Their latest paper investigates how strong light-matter coupling of a tightly confined electromagnetic mode can be used to steer this reaction. The results suggest that the cavity can hugely influence the reaction efficiency and open up alternative reaction pathways.

    New research published
    Figure illustrates a glass containing two water liquids that have different densities surrounded in a cold environment.

    Water’s Heat Capacity Becomes Extreme in Supercooled Conditions

    Using x-ray lasers, researchers at Stockholm University have developed a new ultrafast calorimetry technique to measure the heat capacity (Cp) of water down to 228 K. The finding is that Cp increases dramatically below 240 K and reach a maximum at around 230 K indicating an extreme amount of entropy fluctuations. The results are consistent with existence of a critical point at temperatures around 210-215 K and at pressures 800-1000 bar. Their findings are published this week in the Proceedings of the National Academy (US).

    New research published
    Monitoring coherent light-matter

    Monitoring coherent light-matter interaction in the strong-coupling limit

    In a recently published article in Optics Communications, Themis Mavrogordatos, Fysikum, and Cristóbal Lledó, University College London (UCL), address the coherence of side-scattering in the driven dissipative Jaynes–Cummings (JC) model. They link atomic fluorescence to the multi-photon resonance operation of the JC oscillator and point to the differences from the scattered field of ordinary resonance fluorescence. They show that fluorescence uncovers the details of the cascaded process organizing multi-photon blockade.

    New research published
    Hiranya Peiris

    Hiranya Peiris awarded by the Royal Astronomical Society

    Hiranya Peiris, professor of cosmoparticle physics at the Department of Physics and director of the Oskar Klein Center, Stockholm University, has been awarded with the Eddington Medal 2021 by the Royal Astronomical Society for her ground-breaking exploration of the origins of the Universe.

    "Outstanding contributions to establishing the standard model of cosmology"
    Physics World top 10 breakthrough

    Top 10 breakthrough of the year - research from Stockholm University noticed by Physics World

    The article "Tracking the dynamics of an ideal quantum measurement" has among 550 new research papers been selected as a top 10 breakthrough of the year by Physics World. 

    Findings shed new light onto the inner workings of Nature
    The impact of alkali metal cations on the OER activity.

    Activity descriptors of nickel-iron oxygen evolution electrocatalysts in the presence of cations

    The oxygen evolution reaction (OER) is a key process that enables the storage of renewable energies in the form of chemical fuels. Electrolyte alkali metal cations have been shown to modify the activity and reaction intermediates in OER; however, the exact mechanism was not understood – until recently.

    New research published
    Hiranya Peiris - Foto: Niklas Björling

    Hiranya Peiris is awarded the Max Born Medal and Prize 2021

    Hiranya Peiris receives the award for her outstanding contribution in cosmology, where she has created new interdisciplinary connections between cosmology and high-energy physics.

    Hiranya Peiris is awarded the Max Born Medal and Prize 2021
    Figure illustrates a glass containing two water liquids that have different densities surrounded in a cold environment.

    Two liquids of water exist

    Using x-ray lasers, researchers at Stockholm University have been able to follow the transformation between two distinct different liquid states of water at around -63 Centigrade, both being made of H2O molecules. Even though the two liquids can only be studied under extreme conditions, their existence strongly influences many of waters unique properties in our daily life. Their findings are published in the journal Science.

    New research published
    Image credit: C. Lledó

    Exploring the collective and individual channels of light-matter interaction

    In two reports published this month, we investigate atomic emission and light-matter correlations in absorptive optical bistability. From a linearized treatment of quantum fluctuations we show a visible departure from classical behavior and propose an experimental setup to extract the otherwise hidden collective degree of freedom coupled to the intracavity field.

    New research published
    Två doktorander i skyddsglasögon utför experiment

    Electron–spin dynamics studied on its natural time-scale

    By using extremely short light pulses and coincidence technology, researchers from several Swedish universities have managed to follow the dynamic process when the electron's spin - its rotation around its own axis - controls how an atom absorbs light

    New insight into electron-spin dynamics of photo-induced phenomena
    Rotation, precession, and nutation in obliquity of a planet

    Spin nutation in magnetic materials observed for the first time

    For the first time, spin nutation in magnetic materials has been observed. The discovery could impact the way digital information is saved and lead to a faster, more compact and more energy-efficient technology.

    New research published
    First Results from Desiree

    First research from DESIREE using merged-beams

    The DESIREE facility, with its unique design of two storage rings with a common straight section was constructed in order to study reactions between pairs of oppositely charged atomic or molecular ions. The results of the first such experiment have recently been published.

    New research published
    Schematic diagram of the experimental setup GANDALPH. A beam of negative ions enter the vacuum chamber to the left ans is overlapped with a laser beam. The neutrals created in photodetachment continue to the right and hit the detector, and the negative ion beam is bent to hit the ion detector.

    The rarest element on earth is studied in detail

    Can the rarest element on earth, astatine, be used to treat tumors? A new study published in Nature Communications is the first to measure in detail the electron affinity of astatine that is relevant for development of targeted alpha therapy.

    New research published
    The schematic of the experiment used to capture the alignment of water molecules by the laser light. By using X-ray lasers, scientists have seen that the water molecules can be aligned for a very short time, forming a liquid crystal. Water molecules that are in a low-density liquid (LDL – blue regions) are easier to align that those in a high density liquid (HDL – yellow regions).

    X-rays indicate that water can behave like a liquid crystal

    Scientists at Stockholm University have discovered that water can exhibit a similar behavior like a liquid crystal when illuminated with laser light. This effect originates by the alignment of water molecules, which exhibit a mixture of low- and high-density domains that are more or less prone to alignment. Can this discovery have future technological applications?

    New results reported in Physics Review Letters
    Photo XENON collaboration

    Excess Events observed in Dark Matter Experiment

    Scientists from the international XENON collaboration announced today that data from their XENON1T, the world's most sensitive dark matter experiment, show a surprising excess of events.

    The signal is consistent with solar axions

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