Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

CCNY physicists master unexplored electron property

26.07.2017

While the charge and spin properties of electrons are widely utilized in modern day technologies such as transistors and memories, another aspect of the subatomic particle has long remained uncharted. This is the "valley" property which has potential for realizing a new class of technology termed "valleytronics" - similar to electronics (charge) and spintronics (spin). This property arises from the fact that the electrons in the crystal occupy different positions that are quantum mechanically distinct.

Now City College of New York physicists led by Vinod Menon have demonstrated how to manipulate the "valley" property using light by placing two-dimensional semiconductors in a light trapping structure called microcavity.


Schematic showing control of valley properties in 2-D semiconductors embedded in microcavity.

Image courtesy: Zheng Sun

This gave rise to half-light-half matter quasi-particles which have the fingerprint of the "valley" property. These quasi-particles were then optically controlled using a laser to access the electrons occupying specific "valley."

The research appears in the latest issue of Nature Photonics and is a major step towards realization of "valleytronic" devices for logic gates.

"Observing this property in traditional semiconductors was not easy. However with the advent of the new class of two-dimensional semiconductors, this property became accessible to manipulation," said Zheng Sun, a graduate student in Menon's research group and lead author of the paper.

###

Other researchers included CCNY graduate students, Jie Gu and Christopher Considine; undergraduate Michael Dollar, postdoctoral researcher Biswanath Chakraborty, Zav Shotan, and Xiaoze Liu; physics professor Pouyan Ghaemi and his postdoctoral researcher Areg Ghazaryan; and Stephane Kena-Cohen (Ecole Polytechnic, Montreal, Canada) also participated in the study.

The work was supported by the NSF through the EFRI 2-DARE program, the ECCS division, the Columbia-CCNY NSF MRSEC Center, the US Army Research Office and a Discovery grant from the Natural Sciences and Engineering Research Council of Canada.

Media Contact

Jay Mwamba
jmwamba@ccny.cuny.edu
212-650-7580

http://www2.ccny.cuny.edu 

Jay Mwamba | EurekAlert!

Further reports about: CCNY Electrons Photonics logic gates semiconductors

More articles from Physics and Astronomy:

nachricht Hubble sees Neptune's mysterious shrinking storm
16.02.2018 | NASA/Goddard Space Flight Center

nachricht Supermassive black hole model predicts characteristic light signals at cusp of collision
15.02.2018 | Rochester Institute of Technology

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

Im Focus: Autonomous 3D scanner supports individual manufacturing processes

Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).

Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Fingerprints of quantum entanglement

16.02.2018 | Information Technology

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers

16.02.2018 | Health and Medicine

Hubble sees Neptune's mysterious shrinking storm

16.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>