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HZB.Edu

Helmholtz-Zentrum Berlin für Materialien und Energie (Helmholtz Center for Materials and Energy, HZB) is part of the Helmholtz Association of German Research Centres. The institute studies the structure and dynamics of materials and investigates solar cell technology. Several large scale facilities are available, the most important of which are the 10 MW BER II nuclear research reactor at the Lise Meitner campus in Wannsee and the third-generation BESSY II synchrotron in Adlershof.

Quantum information theory: Quantum complexity grows linearly for an exponentially long time

“Physicists know about the huge chasm between quantum physics and the theory of gravity. However, in recent decades, theoretical physics has provided some plausible conjecture to bridge this gap and to describe the behaviour of complex quantum many-body systems, for …

Green information technologies: Superconductivity meets Spintronics

“Superconducting coupling between two regions separated by a one micron wide ferromagnetic compound has been proved by an international team. This macroscopic quantum effect, known as Josephson effect, generates an electrical current within the ferromagnetic compound made of superconducting Cooper-pairs …

World record again at HZB: Almost 30 % efficiency for next-generation tandem solar cells

“Three HZB teams led by Prof. Christiane Becker, Prof. Bernd Stannowski and Prof. Steve Albrecht have jointly managed to increase the efficiency of perovskite silicon tandem solar cells fabricated completely at HZB to a new record value of 29.80 …

Spintronics: Exotic ferromagnetic order in two-dimensions

“An international team has detected at HZB’s vector magnet facility VEKMAG an unusual ferromagnetic property in a two-dimensional system, known as “easy-plane anisotropy”. This could foster new energy efficient information technologies based on spintronics for data storage, among other …

Ultrafast magnetism: heating magnets, freezing time

“Magnetic solids can be demagnetized quickly with a short laser pulse, and there are already so-called HAMR (Heat Assisted Magnetic Recording) memories on the market that function according to this principle. However, the microscopic mechanisms of ultrafast demagnetization remain unclear …

Perovskite solar cells: Defects trap charge carriers - and release them again

“An international team at HZB and Charles University Prague has investigated how charge carriers in so called MAPI-perovskite semiconductors interact with different defects. They show that a large proportion of defects quickly releases trapped charge carriers. These results could …

A sharp look into tiny ferroelectric crystals

“What happens to ferroelectric materials when their dimensions are greatly reduced? A team of researchers at HZB has now been able to show how this question can be answered in a detailed way. Ferroelectric materials have a special inner structure …

Beam diagnostics for future laser wakefield accelerators

“For decades, particle accelerators have been getting bigger and bigger. In the meantime, ring accelerators with circumferences of many kilometres have reached a practical limit. Linear accelerators in the GHz range also require very long construction lengths. For some years …

Disorder brings out quantum physical talents

“Quantum effects are most noticeable at extremely low temperatures, which limits their usefulness for technical applications. Thin films of MnSb2Te4, however, show new talents due to a small excess of manganese. Apparently, the resulting disorder provides spectacular properties: The material …

When vibrations increase on cooling: Anti-freezing observed

“An international team has observed an amazing phenomenon in a nickel oxide material during cooling: Instead of freezing, certain fluctuations actually increase as the temperature drops. Nickel oxide is a model system that is structurally similar to high-temperature superconductors. The …