Navigation Links
Exotic particles, chilled and trapped, form giant matter wave

Physicists have trapped and cooled exotic particles called excitons so effectively that they condensed and cohered to form a giant matter wave.

This feat will allow scientists to better study the physical properties of excitons, which exist only fleetingly yet offer promising applications as diverse as efficient harvesting of solar energy and ultrafast computing.

"The realization of the exciton condensate in a trap opens the opportunity to study this interesting state. Traps allow control of the condensate, providing a new way to study fundamental properties of light and matter," said Leonid Butov, professor of physics at the University of California, San Diego. A paper reporting his team's success was recently published in the scientific journal Nano Letters.

Excitons are composite particles made up of an electron and a "hole" left by a missing electron in a semiconductor. Created by light, these coupled pairs exist in nature. The formation and dynamics of excitons play a critical role in photosynthesis, for example.

Like other matter, excitons have a dual nature of both particle and wave, in a quantum mechanical view. The waves are usually unsynchronized, but when particles are cooled enough to condense, their waves synchronize and combine to form a giant matter wave, a state that others have observed for atoms.

Scientists can easily create excitons by shining light on a semiconductor, but in order for the excitons to condense they must be chilled before they recombine.

The key to the team's success was to separate the electrons far enough from their holes so that excitons could last long enough for the scientists to cool them into a condensate. They accomplished this by creating structures called "coupled quantum wells" that separate electrons from holes in different layers of alloys made of gallium, arsenic and aluminum.

Then they set an electrostatic trap made by a diamond-shaped electrode and chilled their special semiconducting material in an optical dilution refrigerator to as cold as 50 milli-Kelvin, just a fraction of a degree above absolute zero.

A laser focused on the surface of the material created excitons, which began to accumulate at the bottom of the trap as they cooled. Below 1 Kelvin, the entire cloud of excitons cohered to form a single matter wave, a signature of a state called a Bose-Einstein condensate.

Other scientists have seen whole atoms do this when confined in a trap and cooled, but this is the first time that scientists have seen subatomic particles form coherent matter waves in a trap.

Varying the size and depth of the trap will alter the coherent exciton state, providing this team, and others, the opportunity to study the properties of light and mater in a new way.

Contact: Susan Brown
University of California - San Diego

Related biology technology :

1. New study confirms exotic electric properties of graphene
2. Exotic behavior when mechanical devices reach the nanoscale
3. Food and Beverage Giant Joins Kannapolis Research Center
4. Bay Area Youth to Represent ALS Patients at Giants and Angels Baseball Games on July 4th
5. Nevada Burning Man Festival Sees Giant Aerial Marijuana Bud Banner That Protests Hydroponics Hijacking
6. Reuters Highlights NutraPharma Financial Giant Predicts NutraPharma (OTCBB: NPHC) Shares Likely to Outperform the Market
7. Abt Electronics Becoming the Green Giant of Independent Retailers
8. VIASPACE CEO Discusses Giant King Grass at Industrial Biotechnology Congress in China
9. Trouble with sputter? Blame giant nanoparticles
10. Nanowires exhibit giant piezoelectricity
11. Carbon nanotube muscles generate giant twist for novel motors
Post Your Comments:
Related Image:
Exotic particles, chilled and trapped, form giant matter wave
(Date:10/8/2015)... MADISON, N.J. , Oct. 8, 2015  Genetic ... guidelines may aid the identification of more couples at ... to a study presented today at the 2015 American ... through October 10 in Baltimore, Maryland ... from Quest Diagnostics (NYSE: DGX ) are presenting ...
(Date:10/8/2015)... 2015 .   ... Goldman Small Cap Research, a stock market ... microcap sectors, announced today that it has published ... Inc. (OTCQB - PMCB), a publicly traded, clinical ... treatments for cancer and diabetes. To view the ...
(Date:10/8/2015)...  The ALS Association, in partnership with Prize4Life, is ... revolutionize communication technology solutions for people living with ALS. ... (amyotrophic lateral sclerosis) is a progressive neurodegenerative disease that ... spinal cord. Eventually, people with ALS lose the ability ... to total paralysis and death within two to five ...
(Date:10/8/2015)... , ... October 08, 2015 , ... Talon Innovations, a ... Aerospace and other technology-driven industries, announces that it is one of three finalists for ... Midsize Company.” On Thursday, September 25 Talon Innovations was recognized as a nominee ...
Breaking Biology Technology:
... Verenium Corporation (Nasdaq: VRNM ), a leading ... of high-performance enzymes, today reported a summary of recent ... and nine months ended September 30, 2011. ... the first nine months of this year," said James ...
... Nov. 10, 2011 Theravalues, a Japan ... impacts positively on the prevention of heart failure and ... the human clinical trial started with the registration in ... Organization Kyoto Medical Center and University of Shizuoka, Japan, ...
... Kluwer Pharma Solutions, a leading provider of scientific information ... to investors through Bloomberg Tradebook,s Independent Research Provider (IRP) ... in Thought™, Wolters Kluwer Pharma Solutions, research ... pharmaceutical drugs and medical devices. ...
Cached Biology Technology:
(Date:9/10/2015)... Report Details The global wearable ... previous expectations of revenues, consumer adoption and even technological ... which wearables begin to achieve that mass market acceptance ... reasons is the entrance of Apple to the SmartWatches ... but the overall size of the wearable technology market. ...
(Date:9/9/2015)... , Sept. 9, 2015  NuData Security ... and solution-based milestones, furthering the company,s commitment to ... online fraud. NuData Security,s online fraud ... the company,s growth cycle. The product combines continual ... determine good user behavior from fraudulent behavior, allowing ...
(Date:9/2/2015)... Sept. 2, 2015 About hand geometry biometrics ... banks, government organizations, telecommunication and hospitals as well as ... badges, and numeric keypads are used to prevent unauthorised ... palm and fingers of an individual, width of the ... with infrared light and reflectors can be used for ...
Breaking Biology News(10 mins):
... School of Medicine (BUSM) have found a link ... HIV-infected persons. The study appears online in the ... Deficiency Syndromes., Alcohol use is common among HIV-infected ... has been examined in in-vitro, animal and human ...
... Pacific Northwest National Laboratory,have discovered a way to ... creation of a portable biosensor that can address ... nerve agents, the need to quickly distinguish between ... The sensor components resemble a pregnancy test ...
... biological systems engineering, is leading the team of ... Sciences ( ) at Virginia Tech ( ... convert poultry litter into bio-oil, providing an economical ... issues. Agblevor will present the research during ...
Cached Biology News:
... The high-performance triple quadrupole 1200L sets ... today's cost-conscious environment - incorporating the ... for all liquid chromatography analytical needs. ... interface and the Transmission Quadrupole Analyzer ...
C1-inhibitor (C1-INH)...
... ATP-Free using Mo Bio luciferase assay. Mo Bio ... that will allow you to certify your products ... enable you to deliver them to your customers ... detection limit is 3.5 x 10-12 /l, which ...
Choriongonadotropin (human, hCG)...
Biology Products: