New energy pattern observed at National High Magnetic Field Laboratory
2013 05 17

By Thomas Anderson | TGDaily

Two research teams at the National High Magnetic Field Laboratory (MagLab) smashed through a nearly 40-year barrier recently when they observed a never-before-seen energy pattern.

The butterfly-shaped pattern was first theorized by physicist Douglas Hofstadter in 1976, but it took the tools and technology now available at the MagLab to prove its existence.

"The observation of the ’Hofstadter butterfly’ marks a real landmark in condensed matter physics and high magnetic field research," said Greg Boebinger, director of the MagLab. "It opens a new experimental direction in materials research."

This groundbreaking research demanded the ability to measure samples of materials at very low temperatures and very high magnetic fields, up to 35 tesla. Both of those conditions are available at the MagLab, making it an international destination for scientific exploration.

The unique periodic structure used to observe the butterfly pattern was composed of boron nitride (BN) and graphene. Graphene is a Nobel Prize-winning material that holds tremendous promise in revolutionizing computers, batteries, cell phones, televisions and even airplanes. A one-atom thick, honeycomb array of carbon atoms, graphene is virtually see-through, yet 300 times stronger than steel and 1,000 times more conducting than silicon.

"This is about a puzzle that has been solved," said Eric Palm, deputy director at the MagLab. "It is really about scientific curiosity. It is an exciting confirmation of a theory that was made years ago."

MagLab physicist Nicholas Bonesteel agreed, adding "The Hofstadter butterfly is a beautiful fractal energy pattern that has intrigued physicists for decades. Seeing clear experimental evidence for it is a real breakthrough."

[...]

Read the full article at: tgdaily.com




What the teams did was place graphene – a layer of carbon just one atom thick – on an extremely flat surface of a boron-nitride crystal. As both materials have similar hexagonal structures, the researchers observed "Moiré patterns", which are regular patterns created whenever two similar 2D lattices are overlaid. (The Manchester and MIT groups used single-layer graphene, while the Columbia-led experiment involved bilayer graphene.) By tweaking the relative orientation of the two lattices, the teams were able to create superlattices with appropriate spacing. Source


Butterfly seen at long last





Related Articles
Nature: Hofstadter’s butterfly and the fractal quantum Hall effect in moiré superlattices
Scientists use magnetic nano-rods to investigate how matter assembles
New Discovery Provides Unprecedented Control of Magnetic Fields


Latest News from our Front Page

The War Against Whites Is Massively Incentivized
2014 08 28
The war on Whites is getting increasingly obvious, to the point that a very mainstream source, Congressman Mo Brooks, stated it and then refused to back down. This war is being carried on with a number of very potent weapons. At TOO we have stressed the moral onslaught which has inculcated guilt among legions of Whites for actions that have occurred ...
Study Offers Clues to Arctic Mystery: Paleo-Eskimos’ Abrupt Extinction
2014 08 28
Seven hundred years ago, the Dorset people disappeared from the Arctic. The last of the Paleo-Eskimos, the Dorset culture had dominated eastern Canada and Greenland for centuries, hunting seal and walrus through holes in the ice and practicing shamanistic rituals with ornate carvings and masks. Then, they promptly ceased to exist. Modern archaeologists have scoured troves of Arctic artifacts, searching for ...
Lois Lerner’s IRS Blackberry Destroyed After Federal Probe
2014 08 28
The IRS destroyed former Lois Lerner’s BlackBerry after Congress started probing whether the IRS was targeting conservative groups. Lerner was director of the Exempt Organizations Division of the IRS. A sworn declaration of Thomas Kane, a senior IRS lawyer, reveals that in June 2012, the IT department of the IRS wiped any sensitive or proprietary information from the BlackBerry in ...
White Marine Beaten by Black Mob in Michael Brown ‘Revenge’ Attack
2014 08 28
Police refuse to treat incident as a hate crime A white Marine was left in an induced coma after a group of black men brutally beat him as part of a revenge attack in response to the killing of 18-year-old Michael Brown in Ferguson, Missouri. The incident began at West Point Waffle House in Mississippi on Saturday morning at around 1am. With ...
Study: Exposure to Endocrine disrupting Chemicals Can Affect Future Generations
2014 08 28
Scientists have known that toxic effects of substances known as endocrine disrupting chemicals (EDCs), found in both natural and human-made materials, can pass from one generation to the next. New research shows that females with an ancestral exposure to EDC may show especially adverse reactions to stress. According to a new study by researchers from The University of Texas at Austin ...
More News »