Phys.org September 3, 2020 Researchers in China investigated the superconducting properties of two-dimensional crystalline superconducting PdTe2 films grown by molecular beam epitaxy. They observed the experimental evidence of anomalous metallic state and detected type-II Ising superconductivity existing in centrosymmetric systems. Moreover, the superconductivity of PdTe2 films remains almost the same for more than 20 months without any protection layer. This macro-size ambient-stable superconducting system with strong spin-orbit coupling shows great potentials in superconducting electronic and spintronic applications…read more.
Tag Archives: Spintronics
In leap for quantum computing, silicon quantum bits establish a long-distance relationship
EurekAlert December 25, 2019 Silicon spin qubits have several advantages over superconducting qubits – they retain their quantum state longer than competing qubit technologies and they could be manufactured at low cost. A team of researchers in the US (Princeton University, industry) connected the qubits via a “wire” which is a narrow cavity containing a photon that picks up the message from one qubit and transmits it to the next qubit. The two qubits were located about half a centimeter apart. The team succeeded in tuning both qubits independently of each other while still coupling them to the photon. An […]
Scientists discover first antiferromagnetic topological quantum material
Science Daily December 19, 2019 An international team of researchers led by Spain has developed a crystal growing technique for intrinsically magnetic topological material manganese-bismuth telluride (MnBi2Te4) and characterized the physical properties of the crystals. The team was able to prove both in theory and in spectroscopic experiments that MnBi2Te4 is the first antiferromagnetic topological insulator (AFMTI) below its Néel temperature. They optimized the synthesis protocol for the new material so that MnBi2Te4 single crystals can be produced more easily. Recent findings show that there are even more structural derivatives of MnBi2Te4, which are relevant in the context of MTI…read […]
New spin directions in pyrite an encouraging sign for future spintronics
Science Daily November 12, 2019 Generating and manipulating out-of-plane spins without applying an external electric or magnetic field has been a key challenge in spintronics. Researchers in Australia demonstrate for the first time that pyrite-type (Pyrite is an iron-sulfide mineral that displays multiple internal planes of electronic symmetry) crystals can host unconventional energy- and direction-dependent spin textures on the surface, with both in-plane and out-of-plane spin components, in sharp contrast to spin textures in conventional topological materials. The findings provide a platform for experimentalists to detect and exploit unconventional surface spin textures in future spin-based nanoelectronic devices…read more. Open Access […]
Conductivity at the edges of graphene bilayers
EurekAlert September 11, 2019 At the edges of graphene bilayers atoms can exist in a quantum spin Hall state (QSH) depending on spin-orbit coupling (SOC). While the QSH state is allowed for ‘intrinsic’ SOC, it is destroyed by ‘Rashba’ SOC. Researchers in India have shown that the interaction between the two types of SOC are responsible for variations in the ways in which graphene bilayers conduct electricity. For nanoribbons of bilayer graphene, whose edge atoms are arranged in zigzag patterns, the bands of electron energies which are allowed and forbidden are significantly different to those found in monolayer graphene. This […]
Light may increase magnetic memory speeds 1000 times, decrease electricity consumption
Phys.org July 11, 2019 To reduce energy consumption in magnetic memory devices and improve their speeds, a team of researchers in the US (NIST, University of Colorado, University of Oregon) has developed a method that uses optics through localized surface plasmon resonances to couple light to nanomagnets and produce faster spintronic devices switching speeds and potential lower energy consumption. The method could ultimately lead to memory writing speeds that are 1,000 times faster than current ones…read more. TECHNICAL ARTICLE
Perfect quantum portal emerges at exotic interface
Nanowerk June 26, 2019 A team of researchers in the US (University of Maryland, UC Irvine) has observed perfect Andreev reflection in point-contact spectroscopy—a clear signature of Klein tunneling and a manifestation of the underlying ‘relativistic’ physics of a proximity-induced superconducting state in a topological Kondo insulator. The findings shed light on a previously overlooked aspect of topological superconductivity and can serve as the basis for a unique family of spintronic and superconducting devices, the interface transport phenomena of which are completely governed by their helical topological states…read more. TECHNICAL ARTICLE
Lasers make magnets behave like fluids
Science Daily April 18, 2019 When a magnet is hit with a short enough laser pulse the spins within a magnet will no longer point just up or down, but in all different directions canceling out the metal’s magnetic properties. Using mathematical modeling, numerical simulations and experiments an international team of researchers (USA – University of Colorado, NIST, SLAC, Temple University, UK, Sweden, U, Italy, Germany, China, Japan, Belgium) has shown that the spins behaved like a superfluid 3 picoseconds after a laser pulse hits and then form small clusters with the same orientation like “droplets” in which the spins […]
Nanoscale pillars as a building block for future information technology
Science Daily October 5, 2018 A key element for future spin-light applications is efficient quantum information transfer at room temperature, but at room temperature the electron spin orientation is nearly randomized. This means that the information encoded in the electron spin is lost or too vague to be reliably converted to its distinct chiral light. Researchers in Sweden have devised an efficient spin-light interface. The key element of the device is extremely small disks of GaNAs, a couple of nanometres high stacked on top of each other with a thin layer of GaAs between to form chimney-shaped nanopillars. Fewer than […]
Research team finds evidence of matter-matter coupling
Phys.org August 23, 2018 An international team of researchers (USA – Rice University, Argonne National Laboratory, Japan, China, Germany) demonstrated that cooperative enhancement of the coupling strength occurs in a magnetic solid in the form of matter-matter interaction. Specifically, the exchange interaction of N paramagnetic erbium(III) (Er3+) spins with an iron(III) (Fe3+) magnon field in erbium orthoferrite (ErFeO3) exhibits a vacuum Rabi splitting whose magnitude is proportional to N. Their results provide a route for understanding, controlling, and predicting novel phases of condensed matter using concepts and tools available in quantum optics. The discovery could help advance the understanding of […]