Prof. Kazuyuki Sakamoto visited us and gave us a lecture entitled
"Novel electronic properties of atomic-layer crystals".
He started the talk from the introductory part for M1 students
"why the surface is important", "How the nanotechnology has been developed" etc.
It was impressively clear and passionate introductory.
The message I got was an introductory talk can be clear to such an extent and attracting.
And from the middle of the talk,
it was a kind of a "successive attack of spin-lifted surface structures"!
Tl/Si(111), Bi/Si(111), Tl/Si(110) and In/Si(111) 'Rashba-like' spin split band structures
obtained by spin-resolved ARPES were introduced,
and the results were summarized in terms of the structure symmetry of the surface structures.
Kobayashi et al. Phys. Rev. Lett. 125, 176401 (2020) is the newest must-read paper.
I didn't know the laser excited SARPES has such energy and momentum resolutions nowadays.
My old friend Si(111)r7xr3-In appears in a completely different look...!