Nanowerk August 18, 2022 The phase transition between non-trivial and trivial topological states is important for next-generation technology, such as dissipation-free electronics. A team of researchers in the US (SLAC National Accelerator Laboratory, Stanford University, Harvard University, the State University of New Jersey) has demonstrated that circularly polarized laser-field-driven high-harmonic generation is distinctly sensitive to the non-trivial and trivial topological phases in the prototypical three-dimensional topological insulator bismuth selenide. The phase transition is chemically initiated by reducing the spin–orbit interaction strength through the substitution of bismuth with indium atoms. The phase transition is chemically initiated by reducing the spin–orbit interaction […]
Tag Archives: Spin-orbit interaction
Qubits composed of holes could be the trick to build faster, larger quantum computers
Phys.org April 2, 2021 Strong spin-orbit interactions make hole quantum dots central for scalable quantum computation. Therefore it is important to establish to what extent spin-orbit coupling exposes qubits to electrical noise, facilitating decoherence. Taking Ge as an example an international team of researchers (Australia, Canada) has shown that group IV gate-defined hole spin qubits generically exhibit optimal operation points, defined by the top gate electric field, at which they are both fast and long-lived: the dephasing rate vanishes to first order in the electric field noise along with all directions in space, the electron dipole spin resonance strength is […]