Navigation Links
Bilayer graphene gets a bandgap
Date:6/11/2009

electrons) is finite, and fixed by the crystalline structure of the material. In bilayer graphene, however, as Wang's team demonstrated, the bandgap is variable and can be controlled by an electrical field. Although a pristine graphene bilayer has zero bandgap and conducts like a metal, a gated bilayer can have a bandgap as big as 250 milli-electron volts and behave like a semiconductor.

With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

Wang emphasizes that these first experiments are only the beginning. "The electrical performance of our demonstration device is still limited, and there are many routes to improvement, for example through extra measures to purify the substrate."

Nevertheless, he says, "We've demonstrated that we can arbitrarily change the bandgap in bilayer graphene from zero to 250 milli-electron volts at room temperature, which is remarkable in itself and shows the potential of bilayer graphene for nanoelectronics. This is a narrower bandgap than common semiconductors like silicon or gallium arsenide, and it could enable new kinds of optoelectronic devices for generating, amplifying, and detecting infrared light."

"Direct observation of a widely tunable bandgap in bilayer graphene," by Yuanbo Zhang, Tsung-Ta Tang, Caglar Girit, Zhao Hao, Michael C. Martin, Alex Zettl, Michael F. Crommie, Y. Ron Shen, and Feng Wang, appears in the June 11, 2009 issue of Nature. Zhang, Tang, and Girit are members of UC Berkeley's Department of Physics, in the groups of Professors Crommie, Shen, and Zettl respectively; Zettl, Crommie, and Shen are also members of Berkeley Lab's Materials Sciences Division.


'/>"/>

Contact: Paul Preuss
paul_preuss@lbl.gov
510-486-6249
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Page: 1 2 3 4

Related biology technology :

1. Graphene may have advantages over copper for IC interconnects at the nanoscale
2. Graphene yields secrets to its extraordinary properties
3. Scientists prove graphenes edge structure affects electronic properties
4. Light-speed nanotech: Controlling the nature of graphene
5. Researchers discover method for mass production of nanomaterial graphene
6. New graphene-based material clarifies graphite oxide chemistry
7. Graphene pioneers follow in Nobel footsteps
8. Penn scientists demonstrate potential of graphene films as next-generation transistors
9. By adding graphene, researchers create superior polymer
10. Graphene-based gadgets may be just years away
11. Graphene used to create worlds smallest transistor
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Bilayer graphene gets a bandgap
(Date:7/11/2014)... , July 11, 2014  Researchers have ... three-dimensional images. The new technology, called Virtual Finger, ... small structures like neurons and synapses using the ... unique technology makes 3D imaging studies orders of ... at an unprecedented level across many areas of ...
(Date:7/10/2014)... Toronto, Canada (PRWEB) July 10, 2014 ... often present in very low abundance and are ... quite challenging and time-consuming. , Join presenters Dr. ... Laboratories, and Dr. John Anders, Head of Quality ... mass spectrometer-based approach that can speed detection and ...
(Date:7/10/2014)... Terascala, the industry leader in ... a former vice president of product management for Flexera ... of marketing. Terascala’s software when combined with leading compute ... highest performance and most reliable solutions for processing big ... channel expansion and broaden its product portfolio. His leadership ...
(Date:7/10/2014)... CA (PRWEB) July 10, 2014 OMICS ... Bioanalytical techniques during 18-20 August, 2014 at Double Tree ... review the recent developments in Analytical & Bioanalytical research ... globe. , Speaking on this occasion, Dr. Srinubabu Gedela, ... Analytica Acta conference is a remarkable one in bringing ...
Breaking Biology Technology:Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 3Novel Ms Techniques Speed Detection of Biopharmaceutical Product and Process Impurities, New Webinar Hosted by Xtalks 2Terascala Expands Executive Team 2Terascala Expands Executive Team 3A Critical Review of Analytical Techniques for Improved Living Standards 2A Critical Review of Analytical Techniques for Improved Living Standards 3A Critical Review of Analytical Techniques for Improved Living Standards 4
... ... ... conservation, better materials for frontier technologies and new economic engines, and breakthroughs in understanding diseases: ... enabled by an upgrade to the Advanced Photon Source (APS) at the U.S. Department of ...
... BANGALORE, India , May 3 The Global ... today at the 2010 BIO International Convention that they have ... development and clinical use of drugs against tuberculosis (TB), including ... with TB are resistant to at least one of today,s ...
... , May 3 The American College ... American Gastroenterological Association (AGA)Institute today announced an innovative initiative ... at Digestive Disease Week ® 2010.  The peer-driven campaign ... lines of the diagnosis and treatment of hereditary angioedema ...
Cached Biology Technology:Upgrade to Advanced Photon Source Announced by DOE 2Upgrade to Advanced Photon Source Announced by DOE 3Upgrade to Advanced Photon Source Announced by DOE 4TB Alliance and AstraZeneca Form Research Collaboration to Fight Tuberculosis 2TB Alliance and AstraZeneca Form Research Collaboration to Fight Tuberculosis 3TB Alliance and AstraZeneca Form Research Collaboration to Fight Tuberculosis 4ACAAI and AGA Partner to Raise Awareness of Hereditary Angioedema Through 'HAE: Learn About It, Talk About It' 2ACAAI and AGA Partner to Raise Awareness of Hereditary Angioedema Through 'HAE: Learn About It, Talk About It' 3ACAAI and AGA Partner to Raise Awareness of Hereditary Angioedema Through 'HAE: Learn About It, Talk About It' 4ACAAI and AGA Partner to Raise Awareness of Hereditary Angioedema Through 'HAE: Learn About It, Talk About It' 5
(Date:7/11/2014)... Bone and Mineral Research awarded Michael F. Holick, PhD, ... the 2014 Louis V. Avioli Award. Holick, a professor ... known for revolutionizing the understanding of vitamin D and ... honors a member of the American Society for Bone ... and mineral basic research. It is named for ASBMR,s ...
(Date:7/11/2014)... set a "mouse TRAP" to capture the early signs ... published in the Journal of Clinical Investigation . ... TRAP to extract cellular and genetic information from a ... the Rockefeller Institute for Medical Research in 2008, TRAP ... or ribosomes, of the cell type of interest. Scientists ...
(Date:7/11/2014)... China Researchers from Salk Institute for Biological Studies, ... evaluated the safety and reliability of the existing ... new method, TALEN-HDAdV, which could significantly increased gene-correction ... This study published online in Cell Stell ... stem cell-based gene therapy. , The combination of ...
Breaking Biology News(10 mins):BUSM's Michael F. Holick receives American Society for Bone and Mineral Research award 2A new genome editing method brings the possibility of gene therapies closer to reality 2
... 2012) Researchers have gained new insight into why ... achieving a folate concentration considered optimal for reducing the risk ... absence of folate deficiency in the general Canadian population. ... main reason why some women are not achieving levels optimal ...
... Diego, CA, April 10, 2012 The neighborhoods in which ... role in whether or not they eat a healthy diet, ... studies in a special theme issue of the American ... six studies uses the latest concepts and methods in geographic ...
... Boston, MA Meningioma, the most common primary brain ... percent of all primary brain tumors. The most consistently ... ionizing radiation. In the largest study of its ... University School of Medicine, Duke University, UCSF and Baylor ...
Cached Biology News:Geographic information systems demonstrate links between health and location 2Dental X-rays linked to common brain tumor 2