Eli Rotenberg studies a metal alloy that until recently scientists believed
couldn't exist. To do so, he uses light rays one billion times brighter
than the sun. And he visualizes his findings using powerful computer programs
that portray how electrons move within the alloy.
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The movement of electrons
(left) observed in this quasicrystal can be correlated with the quasicrystal's
structure (right). |
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Welcome to state-of-the-art material physics, where scientists use high-tech
tools to explore strange substances with stranger names. Take Rotenberg,
a staff scientist at Berkeley Lab's Advanced Light Source (ALS). He's
interested in quasicrystals, which as the name implies are both like and
unlike conventional crystals. Their in-between state has forced physicists
to rethink the nature of crystalline structures, and they've given Rotenberg
a unique chance to map the uncharted electronic properties of a little-understood
substance. He aims extremely high-energy x-ray photons at a tiny quasicrystal
sample, and uses a spectrometer to record the electrons that are knocked
out. The momentum and direction of these electrons paint a detailed picture
of the inner-workings of the quasicrystal.
"It's like determining what a violin looks like by only hearing
the music it makes," Rotenberg says. "A violin and piano can
both play a C note, but you can differentiate the two instruments because
each has a different frequency. The same holds true for an electron's
momentum -- it can tell us so much about the properties of different solids."
If this sounds complicated, you're right. No one grasps this stuff overnight;
it takes years of work and cutting edge technology.
"And the tools we have at Berkeley Lab's ALS have
given me a whole new vision of materials' properties," says Rotenberg.
How does someone land a job firing photons at exotic metals at Berkeley
Lab? A little luck and a lot of hard work, according to Rotenberg. In
high school, he found himself drawn to physics rather than biology and
chemistry. In college, he majored in applied and engineering physics,
and became very interested in learning how to develop experiments. Although
he was enrolled in an engineering program, he gravitated more toward fundamental
physics courses than real-world applications. By the time he graduated,
he thought of himself as more of a physicist than an engineer, but he
still had much to learn.
He went on to earn his Ph.D. in solid-state physics from UC Berkeley.
Originally, he planned to work for a private lab such as those operated
by IBM and AT&T, but these labs were devoted more to applied physics
than basic science. So Berkeley Lab, an institution with a long history
of fundamental physics research, became the obvious choice. A few years
later, while killing time at a physics conference, he wandered into a
room in which a researcher was discussing quasicrystals -- and Rotenberg
immediately knew he wanted to analyze these strange structures.
More about Eli
Rotenberg's research
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