Phys.org May 11, 2020 Perovskites ability to emit light over a broad wavelength range is widely attributed to broad luminescence with a large Stokes shift to self-trapped excitons forming due to strong carrier–phonon interactions. Researchers in the Netherlands highlight the extrinsic origin of their broad band emission. As shown by below-gap excitation, in-gap states in the crystal bulk are responsible for the broad emission. This insight advances the understanding of the emission properties of low-dimensional perovskites and question the generality of the attribution of broad band emission in metal halide perovskite and related compounds to self-trapped excitons…read more. Open Access […]
Tag Archives: S&T the Netherlands
Suspended layers make a special superconductor
Phys.org November 5, 2019 Researchers in the Netherlands created a suspended double layer of molybdenum disulfide with an ionic liquid on both sides that can be used to create an electric field across the bilayer. In the individual monolayer, such a field will be asymmetric, with positive ions on one side and negative charges induced on the other. However, in the bilayer, they could have the same amount of charge induced at both monolayers, creating a symmetrical system. The electric field that was thus created could be used to switch superconductivity on and off. This means that a superconducting transistor […]
Vibration in one direction only
Phys.org October 10, 2019 Researchers in the Netherlands created a robotic mechanical metamaterial wherein they used local control loops to break reciprocity at the level of the interactions between the unit cells. They showed theoretically and experimentally that first-of-their-kind spatially asymmetric standing waves at all frequencies and unidirectionally amplified propagating waves emerge. These findings realize the mechanical analogue of the non-Hermitian skin effect. They significantly advance the field of active metamaterials for Hermitian physics and open avenues to channel mechanical energy in unprecedented ways. Non-reciprocal transmission of motion is potentially highly beneficial to a wide range of applications, ranging from […]
Listening to quantum radio
Science Daily March 8, 2019 It becomes increasingly difficult to detect long-wavelength single photons because of thermal fluctuations in the background. Researchers in the Netherlands used a superconducting qubit to directly observe the quantization of radio-frequency electromagnetic fields stored in a photonic microresonator. They were then able to manipulate the quantum state of the radio-frequency field, forming one- and two-photon Fock states within the microresonator, and analyze how the system interacts dynamically with its environment. Extending circuit quantum electrodynamics approach could be used for fundamental studies in quantum thermodynamics and find practical application in imaging…read more. TECHNICAL ARTICLE
QuTech researchers put forward a roadmap for quantum internet development
Delft University of Technology (the Netherlands) October 18, 2018 Researchers in the Netherlands describe six phases, starting with simple networks of qubits that could already enable secure quantum communications – a phase that could be reality in the near future. The development ends with networks of fully quantum-connected quantum computers. In each phase, new applications become available such as extremely accurate clock synchronization or integrating different telescopes on Earth in one virtual ‘supertelescope’. This work creates a common language that unites the highly interdisciplinary field of quantum networking towards achieving the dream of a world-wide quantum internet… read more. TECHNICAL […]
Uncovering the interplay between two famous quantum effects
Phys.org July 23, 2018 According to some physicists the next scientific breakthroughs could lie in the interplay between Casimir force and superconductivity. Researchers in the Netherlands developed a sensor that consists of a microchip on which two strings are placed in close proximity. The wires can be cooled down to cryogenic temperatures, making them superconducting. The strings have holes in the centre that act as an optical resonator trapping laser light of a certain wavelength. They used this light to measure small displacements between the two wires, in essence it is possible to measure the forces that are acting upon […]
The quantum internet has arrived (and it hasn’t)
Nature February 14, 2018 Researchers in the Netherlands argue that they could use quantum mechanics to do much more, by harnessing nature’s uncanny ability to link or entangle distant objects, and teleporting information between them. They have already started to build the first genuine quantum network, which will link four cities in the Netherlands. The project, set to be finished in 2020, could be the quantum version of ARPANET. The lead scientist is also coordinating a larger European project, called the Quantum Internet Alliance, which aims to expand the Dutch experiment to a continental scale… read more