The title of the paper is: Optically-induced charge separation and terahertz emission in unbiased dielectrics.
The news release is completely out-to-lunch (eg "Light has electric and magnetic components. Until now, scientists thought the effects of the magnetic field were so weak that they could be ignored." Are you kidding? Light doesn't even propagate without the magnetic field) so I'd start by tracking citations of the original paper.
We know it's electromagnetic waves, but as it says we tend to ignore the latter part.
Having just studied for (and passed! yay me!) my amateur radio license exam, I've been mulling over this common omission of consideration of propagating magnetics. Phase too: we're so focused on frequency that we overlook phase. Polarization is also underrated, with a study last year suggesting "infinite bandwidth" (so said news reports) when used creatively.
If you take a look at how QAM works mathematically, it's getting such wonderful results because it's using two carriers with phase differences to do everything. It lets you do some really cool things depending on how well you can recover that phase.
They meant that they thought magnetic effects were weaker than electric in this particular situation, not in general. It's just worded horrendously in the press release.
The news release is completely out-to-lunch (eg "Light has electric and magnetic components. Until now, scientists thought the effects of the magnetic field were so weak that they could be ignored." Are you kidding? Light doesn't even propagate without the magnetic field) so I'd start by tracking citations of the original paper.