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

UK hospital accused of selling body parts for booze
2014 07 31
A leading cancer hospital is to be investigated following allegations that one of its staff members exchanged human body samples for whisky and cash. The calls to investigate Christies NHS foundation trust came after the accusation was made by an anonymous whistleblower, prompting British MP Rosie Cooper to contact the watchdog, the Human Tissue Authority (HTA), the Manchester Evening News reports. British ...
15 dead, over 220 injured as multiple gas explosions hit Taiwan city
2014 07 31
Several blasts have ripped through Kaohsiung, a city in south-western Taiwan, killing 15, injuring over 220 and overturning the cars in the street, the Fire Agency said. The cause is thought to be gas leaks in the sewage system. The number of those injured is expected to rise, the Fire Department said. Many were also taken to schools across the city ...
TYPOGRAPHICAL ERROR on front page of alleged U.S. criteria for terrorist list
2014 07 31
We highlighted the recent report from Glenn Greenwald’s site, The Intercept, about the United States administration’s ’Terror Watch List’, and how "a 166-page document issued last year by the National Counterterrorism Center, spells out the government’s secret rules for putting individuals on its main terrorist database". Read: BLACKLISTED: The Secret Government Rulebook For Labeling You a Terrorist A reader with a sharp ...
Why is the State so obsessed by, and careless with, deadly pathogens?
2014 07 31
Earlier this month, we ran a report on the CDC anthrax blunder. As if that weren’t bad enough, there have been additional exposures since we posted that report. This time, it involved the shipment of live, highly contagious, and deadly H5N1 avian influenza samples. As previously reported, as many as 841 scientists and staff members at a US Centers for Disease ...
‘Catastrophic’: Hedge fund billionaire Paul Singer warns of EMP
2014 07 31
Imminent: ‘Only a matter of time’ until entire electric grid destroyed by natural or man-made event… Billionaire hedge fund manager Paul Singer is warning investors – and more broadly, lawmakers and leaders – about the potential destructive power of an electromagnetic pulse, or EMP, which could be triggered by solar events or artificially, via blasts in the atmosphere. According to Singer, research ...
More News »