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Research news

  • 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.

Contacts

Jan Conrad
Head of the Department of Physics

Tel: 08-553 787 69
e-mail: conrad@fysik.su.se

Research Divisions

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Chemical physics division
Condensed Matter and Quantum Optics
Cosmology, Particle Astrophysics and Strings
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