Navigation Links
Novel topological crystalline insulator shows mass appeal

CHESTNUT HILL, MA (Aug. 29, 2013) Disrupting the symmetrical structure of a solid-state topological crystalline insulator creates mass in previously mass-less electrons and imparts an unexpected level of control in this nascent class of materials, an international team of researchers reports in the current edition of Science Express.

The researchers not only confirmed several theoretical predictions about topological crystalline insulators (TCIs), but made a significant experimental leap forward that revealed even more details about the crystal structure and electronic behavior of these newly identified materials, according to Boston College Associate Professor of Physics Vidya Madhavan, one of the lead authors of the report.

The findings could pave the way for engineering the electronic properties of TCI surfaces towards novel functionalities at the nanoscale.

"There is a lot of rich physics here that's waiting to be explored," said Madhavan. "We've opened the door to better understanding topological crystalline insulators and the potential of these materials."

Confirmed within the past few years, topological insulators possess interiors that behave like insulators, blocking the flow of electrons. Yet externally, they contain conducting states where electrons can move freely across their surfaces. A few years ago, physicists first posited the existence of TCIs, a new class of topological materials where conducting surface electrons are theorized to obey fundamental quantum laws set by the crystalline structure of the interior.

Starting with a TCI consisting of lead and selenium, researchers sought to disrupt its structural symmetry by provoking, or doping, the material through the addition of tin, Madhavan said. The subsequent disruption had a dramatic effect on mass-less "Dirac" electrons that are present within the material and behave as relativistic particles. The manipulation added mass to some of these electrons, which took their places side-by-side with the Dirac electrons, a startling result in a solid-state material, Madhavan said.

The new massive electrons were measured topologically through scanning tunneling microscopy and electrically through spectroscopy, the researchers report.

The analysis revealed the Dirac point, which is the defining characteristic of the TCI, said Madhavan. Furthermore, the researchers found that varying the amount of tin imparted a measure of control over the material's properties, fulfilling yet another theoretical prediction.

Madhavan said the results confirmed the TCI's exotic band structure, a measure of the energy a surface electron may or may not possess within a solid. At the same time, the fundamental properties of the TCI remained accessible.

Moreover, observing and controlling Dirac electrons in TCIs paves the way for investigating relativistic physics in solid state systems: physics which was previously accessible only in the experiments of high-energy physics where particles are accelerated to speeds close to light.

In addition, the experiments revealed two distinct regimes of fermiology, an energy boundary used to make determinations about the properties of metals and semiconductors.


Contact: Ed Hayward
Boston College

Related biology technology :

1. Novelda Appoints Alf-Egil Bogen as Chief Executive Officer to Lead the Company to the Next Level
2. Medasense Receives Patent Approval for Novel Pain-Monitoring System
3. Micropharma Limited announces new agreement to commercialize novel natural health products
4. Pure Transplant Solutions Launches Crowdfunding Campaign for Its Novel Technology Poised to Change the Future of Organ Transplantation
5. Further Evidence that the PhotoActivation of PRP (PAPRP) is a Novel and Effective Treatment for Osteoarthritis and Knee Pain
6. Novel study using new technologies outlines importance of California condor social groups
7. Innovative Drug Delivery Systems: Novel Product and Formulation Technology Licensing Opportunities for Generic Pharmaceutical Companies
8. NuView Life Sciences Announces Presentation of Data for Novel Prostate and Bladder Cancer Molecular Diagnostic at SNMMI
9. Patheon to Present on “Cleaning Validation: Science, Risk and Novel Approaches to Testing”
10. Empire Genomics Licenses Novel DNA Biomarker for Use in Diagnosing and Creating a Companion Diagnostic Test for Neuroendocrine Prostate Cancer
11. Personal Genome Diagnostics And Blueprint Medicines Form Collaboration to Identify Novel Kinase Targets
Post Your Comments:
(Date:10/8/2015)... ... October 08, 2015 , ... ProMIS Neurosciences, ... agreement to develop and commercialize intellectual property rights belonging to The University of ... 2009, and affords exclusive worldwide rights to intellectual property based on use of ...
(Date:10/7/2015)... ... 07, 2015 , ... Neil Riordan, PhD to Discuss Medicinal Effects of Mesenchymal ... Mar-a-Lago from 3:50 pm to 4:30 pm. , Dr. Riordan is one of the ... He is the Co-Founder and Chief Science Officer of the Riordan-McKenna Institute ...
(Date:10/7/2015)... Oct. 7, 2015   PDI , a leader ... infographic that highlights key challenges across various healthcare settings, ... for the situation. This tool is part of a ... take to create efficiencies and lower healthcare-associated infections. ... guide emphasizes examples of how to use the right ...
(Date:10/7/2015)... CA (PRWEB) , ... October 07, 2015 , ... ... (AFM) today announced a webinar titled Smart Nanostructured Coatings to provide a comprehensive ... 2015. Register for this free webinar at . This webinar will ...
Breaking Biology Technology:
... a key question at the very heart of nanotechnology: ... Polytechnic Institute have discovered the origins of nanorod diameter, ... of atomic transport hold the key to nanorod size. ... identify the fundamental reasons why nearly all nanorods have ...
... Minn., March 19 MedNet Solutions, a global ... study management systems, today announced that one of ... Investigator Initiated Trial (IIT) Management System. This ... to manage the entire IIT lifecycle... from proposal ...
... occurring soil micro-organism proteins to protect cotton plantationsINDIANAPOLIS ... LLC, a wholly owned subsidiary of The Dow ... announced that it has received regulatory approval from ... for its WideStrike(TM) Insect Protection technology ...
Cached Biology Technology:
(Date:9/24/2015)... 2015  EyeLock LLC, a market leader of iris-based ... and latest technology in Booth #602 at next week,s ... EyeLock,s iris authentication technology provides an unprecedented ... making it the most proven way to authenticate one,s ... to deliver a fast and friendly user experience to ...
(Date:9/10/2015)... , Sept. 10, 2015 Report Details ... Study Reveals Selling Opportunities and Revenue Prospects to ... future of biologics, especially new drug classes? Get ... stay ahead with exclusive market data and industry ... trends, developments, results, opportunities and sales predictions. ...
(Date:9/10/2015)... OXFORD, Conn. , Sept. 10, 2015  NXT-ID, ... a biometric authentication company focused on the growing mobile ... based ecommerce site, Touch of Modern, will ... starting Wednesday, September 16 th . ... a wide range of designer lifestyle products to its ...
Breaking Biology News(10 mins):
... behaviour of primates can be understood using artificially-intelligent computer ... in a special edition of Philosophical Transactions of the ... of Science in York. Scientists using agents ... primate groups are despotic whilst others are egalitarian - ...
... LOS ANGELES, Sept. 10 Cogent Systems (Nasdaq:,COGT) ... today announced that,they have reached an agreement to ... fingerprint identification technology.,The agreement is subject to negotiation ... of the agreement, Northrop Grumman has agreed to ...
... Year of Service and ... One Roof, SUNNYVALE, Calif., Sept. 10 Dedicated to ... announced program,highlights for DISKCON USA 2007, the premier storage industry ... Hyatt Regency Hotel / Santa Clara,Convention Center in Santa Clara, ...
Cached Biology News:
MAb to Myoglobin Cardiac...
... ALH 4000 workstation is the simplest, easiest-to-use ... introduce automated liquid handling capabilities,into their labs, ... to support routine applications on a separate ... walk-away automation even when you have ...
... Covance has generated hybridomas against a ... project initiation, you are provided with ... Hybridoma cell lines developed by Covance ... A typical hybridoma development project has ...
... normalization is essential for hunting and ... approaches, such as EST sequencing projects, ... methods are not well suited for ... Evrogen TRIMMER kit, though, is specially ...
Biology Products: