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Creating Matter Directly from Collisions of Light

Nuclear scientists have used a powerful particle accelerator to create matter directly from collisions of light. Scientists predicted this process in the 1930s, but it has never been achieved in a single direct step. The researchers accelerated two beams of gold ions to close to the speed of light in opposite directions.

27 Jan 2022

A Leap-Ahead Technology for Generating Terahertz Radiation

Researchers have taken a major step towards bringing terahertz frequencies out of their hard-to-reach region of the electromagnetic spectrum and into everyday applications. In a new paper, the researchers demonstrate a first-of-its-kind terahertz laser that is compact, operates at room temperature and can produce 120 individual frequencies spanning the 0.25 - 1.3 THz, far more range than previous terahertz sources.

27 Jan 2022

Scientists Make First Detection of Exotic “X” Particles in Quark-gluon Plasma

In the first millionths of a second after the Big Bang, the universe was a roiling, trillion-degree plasma of quarks and gluons — elementary particles that briefly glommed together in countless combinations before cooling and settling into more stable configurations to make the neutrons and protons of ordinary matter.

25 Jan 2022

Researchers Manipulate Nanoparticles Suspended in Superfluid Helium Using Optical Tweezers

Scientists from the Graduate School of Engineering Science at Osaka University used optical tweezers for the first time inside superfluid helium.

24 Jan 2022

Quantum Dots Increase the Performance of Perovskite Solar Cells

Perovskites are hybrid compounds made from metal halides and organic constituents. They show great potential in a range of applications, e.g. LED lights, lasers, and photodetectors, but their major contribution is in solar cells, where they are poised to overtake the market from their silicon counterparts.

21 Jan 2022

Making High Quality Spin Qubits Based on Chromium Defects in Silicon Carbide

Quantum computers may be able to solve science problems that are impossible for today's fastest conventional supercomputers. Quantum sensors may be able to measure signals that cannot be measured by today's most sensitive sensors. Quantum bits (qubits) are the building blocks for these devices. Scientists are investigating several quantum systems for quantum computing and sensing applications.

17 Jan 2022

Entangled Photons Have an Advantage for Sensing the Smallest Rotations

In the field of quantum metrology, scientists are developing novel measurement schemes that benefit from quantum features and are more precise and sensitive than classical conventional methods.

13 Jan 2022

Study Opens New Avenue for Exploring Gauge Field-Induced Topological Physics

Gauge fields describe the basic interactions between charged particles and are responsible for various emergent topological phases of matter. This concept recently has been further generalized to charge neutral systems by engineering an analog Hamiltonian that governs the effective dynamics of neutral particles subject to magnetic fields.

11 Jan 2022

A Comprehensive Overview of Integrated Quantum Photonics

An international team of leading scientists, headed up by Paderborn physicist Professor Klaus Jöns, has compiled a comprehensive overview of the potential, global outlook, background and frontiers of integrated photonics.

10 Jan 2022

Generating Mono-Cycle Terahertz Pulses from Shift Currents in Asymmetric Quantum Wells

A time-dependent electric current emits an electromagnetic wave, a basic physical effect exploited in telecom antennas. Transferring this mechanism to the ultrashort length and time scales of the quantum world allows for generating intense picosecond terahertz (THz) pulses in asymmetric semiconductor quantum structures.

7 Jan 2022