Measuring time without a clock

EPFL scientists have been able to measure the ultrashort time delay in electron photoemission without using a clock. The discovery has important implications for fundamental research and cutting-edge technology.

NRL detects opposite spin in topological insulator surface states

Scientists at the U.S. Naval Research Laboratory (NRL) have reported the first direct comparison of the spin polarization generated in the topologically protected Dirac states of a topological insulator (TI) bismuth selenide ...

Spin filtering at room temperature with graphene

An interdisciplinary team of scientists at the U.S. Naval Research Laboratory (NRL) have reported the first demonstration of metallic spin filtering at room temperature using ferromagnet-graphene-ferromagnet thin film junction ...

Photons do the twist, and scientists can now measure it

Researchers in the University of Minnesota's College of Science and Engineering have measured the twisting force, or torque, generated by light on a silicon chip. Their work holds promise for applications such as miniaturized ...

Spin polarization by strong field ionization

Strong field ionization has been studied for over half a century. Yet, the role of electron spin during this process has been largely overlooked. Surprisingly, our joint experimental and theoretical study shows that a chance ...

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