Navigation Links
Sheet of carbon atoms acts like a billiard table, physicists find

RIVERSIDE, Calif. A game of billiards may never get smaller than this.

Physicists at UC Riverside have demonstrated that graphene a one-atom thick sheet of carbon atoms arranged in hexagonal rings can act as an atomic-scale billiard table, with electric charges acting as billiard balls.

The finding underscores graphenes potential for serving as an excellent electronic material, such as silicon, that can be used to develop new kinds of transistors based on quantum physics. Because they encounter no obstacles, the electrons in graphene roam freely across the sheet of carbon, conducting electric charge with extremely low resistance.

Study results appear in todays issue of Science.

The research team, led by Chun Ning (Jeanie) Lau, found that the electrons in graphene are reflected back by the only obstacle they meet: graphenes boundaries.

These electrons meet no other obstacles and behave like quantum billiard balls, said Lau, an assistant professor who joined UCRs Department of Physics and Astronomy in 2004. They display properties that resemble both particles and waves.

Lau observed that when the electrons are reflected from one of the boundaries of graphene, the original and reflected components of the electron can interfere with each other, the way outgoing ripples in a pond might interfere with ripples reflected back from the banks.

Her lab detected the electronic interference by measuring graphenes electrical conductivity at extremely low (0.26 Kelvin) temperatures. She explained that at such low temperatures the quantum properties of electrons can be studied more easily.

We found that the electrons in graphene can display wave-like properties, which could lead to interesting applications such as ballistic transistors, which is a new type of transistor, as well as resonant cavities for electrons, Lau said. She explained that a resonant cavity is a chamber, like a kitchen microwave, in which waves can bounce back and forth.

In their experiments, Lau and her colleagues first peeled off a single sheet of graphene from graphite, a layered structure consisting of rings of six carbon atoms arranged in stacked horizontal sheets. Next, the researchers attached nanoscale electrodes to the graphene sheet, which they then refrigerated in a cooling device. Finally, they measured the electrical conductivity of the graphene sheet.

Graphene, first isolated experimentally less than three years ago, is a two-dimensional honeycomb lattice of carbon atoms, and, structurally, is related to carbon nanotubes (tiny hollow tubes formed by rolling up sheets of graphene) and buckyballs (hollow carbon molecules that form a closed cage).

Scientifically, it has become a new model system for condensed-matter physics, the branch of physics that deals with the physical properties of solid materials. Graphene enables table-top experimental tests of a number of phenomena in physics involving quantum mechanics and relativity.

Bearing excellent material properties, such as high current-carrying capacity and thermal conductivity, graphene ideally is suited for creating components for semiconductor circuits and computers. Its planar geometry allows the fabrication of electronic devices and the tailoring of a variety of electrical properties. Because it is only one-atom thick, it can potentially be used to make ultra-small devices and further miniaturize electronics.


Contact: Iqbal Pittalwala
University of California - Riverside

Related biology technology :

1. Printable CELLocate Log Sheets for Easily Locating Adhererent Cells
2. Imaging and Analysis of DIGE Product Information Sheet, Rev B
3. QBT Fatty Acid Uptake Assay Kit datasheet
4. FLIPR Calcium Assay Kit Datasheet
5. FLIPR Calcium 3 Assay Kit Datasheet
6. Capital-raising term sheets for angels and venture capitalists
7. Musicnotes strikes deal to distribute Sony/ATV sheet music
8. Balance-sheet success leads to hunt for market dominance at Merge
9. The Analysis of Polycyclic Aromatic Hydrocarbons (PAHs) by LC/MS/MS Using an Atmospheric Pressure Photoionization Source
10. Visions: Carbone bullish on Wisconsin venture capital
11. Engineers chart semiconductors on the scale of atoms
Post Your Comments:
(Date:11/27/2015)... , ... November 27, 2015 , ... ... that includes over 2,000 technical presentations offered in symposia, oral sessions, workshops, ... applied spectroscopy, covers a wide range of applications such as, but not limited ...
(Date:11/25/2015)... Nov. 25, 2015  PharmAthene, Inc. (NYSE MKT: PIP) ... a stockholder rights plan (Rights Plan) in an effort ... carryforwards (NOLs) under Section 382 of the Internal Revenue ... PharmAthene,s use of its NOLs could be substantially ... defined in Section 382 of the Code. In general, ...
(Date:11/25/2015)... /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ:  AEZS; TSX: AEZ) ... remain fundamentally strong and highlights the following developments: ... DSMB recommendation to continue the ZoptEC Phase 3 ... final interim efficacy and safety data , ... with heavily pretreated castration- and Taxane-resistant prostate cancer ...
(Date:11/24/2015)... 2015  Asia-Pacific (APAC) holds the third-largest share ... The trend of outsourcing to low-cost locations is ... volume share for the region in the short ... in the CRO industry will improve. ... ), finds that the market earned revenues ...
Breaking Biology Technology:
(Date:11/20/2015)... 2015 NXTD ) ("NXT-ID" or ... growing mobile commerce market and creator of the Wocket® ... was recently interviewed on The RedChip Money Report ... weekend on Bloomberg Europe , Bloomberg Asia, Bloomberg ... NXTD ) ("NXT-ID" or the "Company"), a biometric ...
(Date:11/18/2015)... , November 18, 2015 ... published a new market report titled  Gesture Recognition Market ... Forecast, 2015 - 2021. According to the report, the global gesture ... is anticipated to reach US$29.1 bn by 2021, at ... North America dominated the global ...
(Date:11/17/2015)... Nov. 17, 2015 Pressure BioSciences, Inc. (OTCQB: ... development and sale of broadly enabling, pressure cycling technology ... industry, today announced it has received gross proceeds of ... Private Placement (the "Offering"), increasing the total amount raised ... more additional closings are expected in the near future. ...
Breaking Biology News(10 mins):