Aktualitäten 2019
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Physics
Results 1 - 20 of 44.
Physics - Materials Science - 19.12.2019
Magnetic energy gaps in topological materials unravelled
By Christoph Pelzl Newly discovered properties of magnetically doped topological insulators could significantly accelerate the development of quantum computers. The transmission electron microscope ASTEM, located at Graz University of Technology, played a major role in the success of these discoveries.
Physics - 18.11.2019
A Remote Control for Everything Small
Atoms, molecules or even living cells can be manipulated with light beams. At TU Wien a method was developed to revolutionize such "optical tweezers". They are reminiscent of the "tractor beam" in Star Trek: special light beams can be used to manipulate molecules or small biological particles. Even viruses or cells can be captured or moved.
Physics - Materials Science - 14.11.2019
New Material Breaks World Record Turning Heat into Electricity
A new type of material generates electrical current very efficiently from temperature differences. This allows sensors and small processors to supply themselves with energy wirelessly. Thermoelectric materials can convert heat into electrical energy. This is due to the so-called Seebeck effect: If there is a temperature difference between the two ends of such a material, electrical voltage can be generated and current can start to flow.
Innovation - Physics - 13.11.2019
New 3D printing for the direct production of nanostructures
By Christoph Pelzl A team from Graz University of Technology succeeded in using the FEBID method to produce complex 3D-printed nano-components for the first time without additional support structures. Additional at the end of the text In the nanometer range, complex, free-standing 3D architectures are very difficult to produce in a single step due to the required precision.
Physics - Materials Science - 13.11.2019
TU Graz researchers develop new 3D printing for the direct production of nanostructures
A team from Graz University of Technology succeeded in using the FEBID method to produce complex 3D-printed nano-components for the first time without additional support structures. Additional pictures for download at the end of the text In the nanometer range, complex, free-standing 3D architectures are very difficult to produce in a single step due to the required precision.
Physics - Materials Science - 11.11.2019
From Lego to New Material Building Blocks
By Birgit Baustädter Materials researcher Florian Lackner "wraps" highly reactive alkali metal atoms in gold and examines them in his laser laboratory. A job he dreamed of when he was a child. "What I'm doing now is exactly what I've always wanted to do." Florian Lackner has achieved what many wish for.
Chemistry - Physics - 21.10.2019
Atomic images reveal unusually many neighbors for some oxygen atoms
The identification of new chemical bonds is crucial for the design of new material structures. A team led by Jani Kotakoski at the University of Vienna and Jannik Meyer at the University of Tübingen has found unexpected new configurations of oxygen and nitrogen in graphene. Direct images of the actual atoms and the analysis of Life as we know it is based on just a handful of different types of atoms (called elements), among them carbon, nitrogen and oxygen.
Physics - Chemistry - 16.10.2019
Atomic force microscopy: new sensing element for high-speed imaging
Researchers at TU Wien have developed a new type of sensing element for atomic force microscopy, which enables a high measurement speed and can even image sensitive processes in living cells. High-definition images of minute objects are standard these days including the imaging of bacteria and viruses, and even molecules and individual atoms in extremely fine details.
Physics - Materials Science - 15.10.2019
Solving the Mystery of Quantum Light in Thin Layers
A very special kind of light is emitted by tungsten diselenide layers. The reason for this has been unclear. Now an explanation has been found at TU Wien (Vienna). It is an exotic phenomenon that nobody was able to explain for years: when energy is supplied to a thin layer of the material tungsten diselenide, it begins to glow in a highly unusual fashion.
Astronomy / Space - Physics - 10.10.2019
’My work is flying through space’
By Birgit Baustädter Did you know that the first Austrian satellite to go into space was built in TU Graz's labs? TUGSAT-1 has been observing stars for more than six years - and it's not the only object made in Graz that is hurtling through space. "The night after the launch I was lying awake in bed and I thought to myself: amazing! This is something that I held in my hands and now it's flying through space," recalls Otto Koudelka, sitting at a glass conference table at the Inffeldgasse site in Graz.
Chemistry - Physics - 04.10.2019
The fast dance of electron spins
Chemists investigate the interactions of metal complexes and light Metal complexes show a fascinating behavior in their interactions with light, which for example is utilized in organic light emitting diodes, solar cells, quantum computers, or even in cancer therapy. In many of these applications, the electron spin, a kind of inherent rotation of the electrons, plays an important role.
Physics - Astronomy / Space - 02.10.2019
Quantum Vacuum: Less than Zero Energy
Is it possible to borrow energy from an empty space? And if yes, do we have to give it back? Energy values smaller than zero are allowed - at least within certain limits. Energy is a quantity that must always be positive - at least that's what our intuition tells us. If every single particle is removed from a certain volume until there is nothing left that could possibly carry energy, then a limit has been reached.
Physics - 01.10.2019
A metronome for quantum particles
A new measurement protocol, developed at TU Wien (Vienna), makes it possible to measure the quantum phase of electrons - an important step for attosecond physics. It is like a microscope for time: Today's methods of attosecond physic allows us to measure extremely short time intervals. With the help of short laser pulses, physical processes can be investigated on a time scale of attoseconds - that is billionths of a billionth of a second.
Physics - Chemistry - 23.09.2019
2000 atoms in two places at once
The quantum superposition principle has been tested on a scale as never before in a new study by scientists at the University of Vienna in collaboration with the University of Basel. Hot, complex molecules composed of nearly two thousand atoms were brought into a quantum superposition and made to interfere.
Chemistry - Physics - 11.09.2019
From years to days: Artificial Intelligence speeds up photodynamics simulations
Scientists use deep neural networks to achieve simulations on long time scales The prediction of molecular reactions triggered by light is to date extremely time-consuming and therefore costly. A team led by Philipp Marquetand from the Faculty of Chemistry at the University of Vienna has now presented a method using artificial neural networks that drastically accelerates the simulation of light-induced processes.
Physics - 02.09.2019
A new alphabet to write and read quantum messages with very fast particles
The interplay of quantum mechanics and special relativity requires a new alphabet to send reliable quantum messages Quantum information relies on the possibility of writing messages in a quantum particle and reading them out in a reliable way. If, however, the particle is relativistic, meaning that it moves with velocities close to the speed of light, it is impossible for standard techniques to unambiguously decode the message and the communication fails.
Physics - Computer Science - 29.08.2019
Entanglement sent over 50 km of optical fiber
For the first time, a team led by Innsbruck physicist Ben Lanyon has sent a light particle entangled with matter over 50 km of optical fiber. This paves the way for the practical use of quantum networks and sets a milestone for a future quantum internet. The quantum internet promises absolutely tap-proof communication and powerful distributed sensor networks for new science and technology.
Physics - Astronomy / Space - 22.08.2019
Quantum gravity’s tangled time
The theories of quantum mechanics and gravity are notorious for being incompatible, despite the efforts of scores of physicists over the past fifty years. However, recently an international team of researchers led by physicists from the University of Vienna, the Austrian Academy of Sciences as well as the University of Queensland (AUS) and the Stevens Institute of Technology (USA) have combined the key elements of the two theories describing the flow of time and discovered that temporal order between events can exhibit genuine quantum features.
Physics - Innovation - 19.08.2019
"Qutrit": Complex quantum teleportation achieved for the first time
Austrian and Chinese scientists have succeeded in teleporting three-dimensional quantum states for the first time. High-dimensional teleportation could play an important role in future quantum computers. Researchers from the Austrian Academy of Sciences and the University of Vienna have experimentally demonstrated what was previously only a theoretical possibility.
Physics - Materials Science - 13.08.2019
How do atoms vibrate in graphene nanostructures?
Innovative new electron spectroscopy technique pushes the limits of Nanospectroscopy for materials design In order to understand advanced materials like graphene nanostructures and optimize them for devices in nano-, optoand quantum-technology it is crucial to understand how phonons - the vibration of atoms in solids - influence the materials' properties.
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