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Research news

  • Hiranya Peiris - Foto: Niklas Björling Hiranya Peiris is awarded the Max Born Medal and Prize 2021 2020-11-27 Hiranya Peiris receives the award for her outstanding contribution in cosmology, where she has created new interdisciplinary connections between cosmology and high-energy physics.
  • Figure illustrates a glass containing two water liquids that have different densities surrounded in a cold environment. Two liquids of water exist 2020-11-27 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.
  • Image credit: C. Lledó Exploring the collective and individual channels of light-matter interaction 2020-11-12 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.
  • Doktoranderna och medförfattarna till artikeln Hugo Laurell och David Busto förbereder ett experiment i attosekundlaboratoriet. Electron–spin dynamics studied on its natural time-scale 2020-10-09 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.
  • First result from DESIREE using merged-beams 2020-09-16 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.
  • Rotation, precession, and nutation in obliquity of a planet Spin nutation in magnetic materials observed for the first time 2020-09-29 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.
  • 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 2020-08-18 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.
  • 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 2020-08-11 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?
  • Photo XENON collaboration Excess Events observed in Dark Matter Experiment 2020-06-18 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.
  • Kinesin  walking - Image : https://commons.wikimedia.org/wiki/File:Kinesin_walking.gif Inferring entropy production from short time series 2020-04-28 Recent research at Fysikum, published in Physical Review Letters, discovers a simple method to quantify dissipation in microscopic non-equilibrium systems by analysing short time series data.
  • New Twist on Strongly Correlated Quantum Matter 2020-04-24 Exotic new states of quantum matter form in twisted graphene systems, according to research from Fysikum published as Editors’ suggestion in Physical Review Letters.
  • ”trapped ions (Azote)”: Dualiteten hos fångad jon- och Rydbergatom-kvantteknologi. Fångade Rydbergjoner kombinerar styrkorna hos två mycket olika kvantprocessorer: fångad jon (ovan) och Rydbergatom (nedan) i en och samma teknik. Tekniken har potential att öka hastigheten hos fångade jonkvantdatorer. Illustration: Elsa Wikande /Azote. Speeding-up quantum computing using giant atomic ions 2020-04-15 Trapped Rydberg ions can be the next step towards scaling up quantum computers to sizes where they can be practically usable, a new study in Nature shows.
  • Hiranya Peiris - Foto: Niklas Björling Hiranya Peiris is awarded the Göran Gustafsson Prize 2020-03-03 The Göran Gustafsson Prize in Physics is awarded to Hiranya Peiris, "for her innovative research on the dynamics of the early universe, which links cosmological observations to basic physics".
  • ALPHA Experiment at Cern - Photo © CERN Mapping out the properties of antimatter 2020-02-21 Why does anything exist? That is really the fundamental question we try to answer through high-precision studies of antimatter. All matter that builds up the universe we see should really have been annihilated through contact with it mirror image – antimatter. Clearly, this has not happened, which is one of the great still unsolved mysteries of Physics.
  • Filming a quantum measurement 2020-02-25 Does a quantum state collapse instantly during measurement? And if not, how much time does the measurement process take and what is the quantum state of the system at any intermediate step?
  • Bioluminescence is the production and emission of light by a living organism as the result of a chemical reaction during which chemical energy is converted to light energy. SU researcher receives funding for new artificial photosynthsis project 2020-02-07 Bioluminescence is the production and emission of light by a living organism as the result of a chemical reaction during which energy is converted to light energy. This is a natural phenomenon and it is most common in deep sea living creatures.
  • Computer simulation of a merger of two neutron stars KAW grants awarded to three projects in which researchers from Fysikum are involved 2019-10-11 The Knut and Alice Wallenberg fundation has announced 20 ground-breaking research projects to receive grants for a total of 640 million SEK. Among them three projects include several researchers at the Department of Physics as co-investigator.
  • Revealing the quantum energy scale of light-matter interaction in a thermodynamic limit 2019-10-01 In this work, we approach a limit probing the nature of light-matter interaction with strong coupling, revealing the significance of quantum fluctuations. We monitor the output channel of a paradigmatic oscillator in quantum optics, described by the Jaynes-Cummings model, subject to an imposed coherent driving field. Drive and decay create the landscape in which the quantum and classical frames are intertwined.
  • Image courtesy of The Branco Weiss Fellowship Interview with Igor Pikovski 2019-10-11 Igor Pikovski recently joined Stockholm University as assistant professor in the Department of Physics. He is a theoretical physicist in the field of quantum optics and quantum information theory. His main interest is the interface between quantum physics at low energies and gravity, especially in a regime that can be accessed in laboratory experiments.
  • Corner States of Light 2019-10-07 Researchers at Stockholm University have managed to create a new kind of light wave whose unique properties may become important e.g. in future communication technology. In a recently published article in Nature Photonics, they have shown how ideas from theoretical quantum and materials physics can be realised in a completely different context, namely in optical waveguides.
  • European grant for novel sustainable energy supply and storage awarded to Fysikum 2019-08-22 An European wide network, involving Markus Kowalewski and Michel Odelius from the Division of Chemical Physics at Fysikum, has received funding from the European Research Council (ERC). The project, which includes partners from 8 different countries, will investigate charge carrier dynamics in materials relevant for novel energy supply and storage.
  • XENON1T installation in the underground hall of Laboratori Nazionali del Gran Sasso. The three story building houses various auxiliary systems. The cryostat containing the LXeTPC is located inside the large water tank next to the building. Photo by Roberto Corrieri and Patrick De Perio.” The extreme of rarity 2019-04-30 OKC researchers helped reveal the rarest nuclear reaction now known to mankind. To observe this ultra-rare process, XENON1T watched a tonne of ultra-pure liquid xenon for a year. The experiment was featured on the cover of the scientific journal 'Nature'
  • Figure 1: A colloidal particle in an optical trap (shown as a red ball), in the presence of thermal noise, can be made to work as a microscopic machine or heat engine. Its fluctuations have some typical features, some of which are shown here. Ref: Phys. Rev. Lett. 122, 140601 Efficiency fluctuations in microscopic machines 2019-04-15 Results of a recent study by physicists from Stockholm University in collaboration with researchers at Nordita and the University of Bielefeld, provide a general understanding of the efficiency fluctuations in microscopic machines.
  • Steering is an essential feature of non-locality in quantum theory 2018-10-15 A physical theory is called non-local when observers can produce instantaneous effects over distant systems. Non-local theories rely on two fundamental effects: local uncertainty relations and steering of physical states at a distance. In quantum mechanics, the former one dominates the other in non-local games. A new study proved that the entanglement-based steering also plays an important role.
  • A schematic showing the band spectrum for a non-Hermitian Chern insulator, which is insulating in the bulk but supports chiral, electronic states on its edges. The gray spectrum corresponds to the eigenvalues of the Hamiltonian with periodic boundary conditions, while the blue corresponds to the eigenvalues of the Hamiltonian on a cylinder. The red corresponds to the chiral, edge state. Strikingly, the spectrum of the system with periodic boundary conditions is vastly different from the spectrum with open boundary conditions. Using the biorthogonal properties of the open system, however, the new theory can accurately predict when it attaches to the bulk spectrum, indicated by the orange and green dashed lines. Topology of non-Hermitian systems unraveled 2018-10-02 The study of topological materials has been an important task in condensed matter physics over the past few decades and was the subject of the 2016 Nobel prize in physics. Recent experiments and theoretical works have shown that unexpected phenomena occur in many open, non-equilibrium and complex systems that can be described using non-Hermitian physics.
  • Ana Predojevic and Markus Hennrich will be coordinating two of the projectes funded by QuantERA ERA-NET Two prestigious Quantum Technology grants for Fysikum 2019-10-07 Fysikum has been very successful in the highly competitive QuantERA ERA-NET Confund call in Quantum Technologies. Two proposals coordinated by Ana Predojevic and Markus Hennrich, at Fysikum, Stockholm University, have been selected for funding.
  • A schematic of the approach used to capture water dynamics on the ultrafast timescale. If one were able to photograph the molecules in real space with different exposure times, the image would become gradually blurry because of the motion of the molecules. This is done with x-ray scattering in the so-called reciprocal space, where the diffraction pattern is gradually smoother for longer pulse durations.  (Image credits: Fivos Perakis/Stockholm University) The Ultrafast Dance of Liquid Water 2018-05-15 It is normally considered that water molecules in the liquid state move randomly on ultrafast timescales due to thermal fluctuations. Researchers at Stockholm University have now discovered an unexpected correlated motion in water dynamics on a sub-100 femtoseconds timescale.

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