Sunday, March 01, 2015

Quantum spin Hall effect in two-dimensional transition metal dichalcogenides

Exotic states materialize with supercomputers. Materials with novel electrical properties discovered using XSEDE computational resources Stampede and Lonestar supercomputers of TACC

UNIVERSITY OF TEXAS AT AUSTIN, TEXAS ADVANCED COMPUTING CENTER

The science team included Ju Li, Liang Fu, Xiaofeng Qian, and Junwei Liu, experts in topological phases of matter and two-dimensional materials research at the Massachusetts Institute of Technology (MIT). They calculated the electronic structures of the materials using the Stampede and Lonestar supercomputers of the Texas Advanced Computing Center.

The computational allocation was made through XSEDE, the Extreme Science and Engineering Discovery Environment, a single virtual system funded by the National Science Foundation (NSF) that scientists use to interactively share computing resources, data and expertise. The study was funded by the U.S. Department of Energy and the NSF.



This picture tells quite a story to scientists. It's a portrait of what they call a topological insulator, materials that conduct only at their edges. Technically it shows the edge density of states calculated for a monolayer transition metal dichalcogenide in the 1T'-MoS2 structural phase.

There's a black gap between the purple blobs at the bottom and top. What's more, there's crisscrossing reddish lines that bridge the gap. The lines indicate the edge state of the material, allowing electrons to cross the gap and conduct electricity. CREDIT: (Credit: Qian et. al.) USAGE RESTRICTIONS: None

"To me, national computing resources like XSEDE, or specifically the Stampede and Lonestar supercomputers, are extremely helpful to computational scientists," Xiaofeng Qian said. In January 2015, Qian left MIT to join Texas A&M University as the first tenure-track assistant professor at its newly formed Department of Materials Science and Engineering.

What Qian and colleagues did was purely theoretical work, using Stampede for part of the calculations that modeled the interactions of atoms in the novel materials, two-dimensional transition metal dichalcogenides (TMDC). Qian used the molecular dynamics simulation software Vienna Ab initio Simulation Package to model a unit cell of atoms, the basic building block of the crystal lattice of TMDC.

"If you look at the unit cell, it's not large. They are just a few atoms. However, the problem is that we need to predict the band structure of charge carriers in their excited states in the presence of spin-orbit coupling as accurately as possible," Qian said.

Scientists diagram the electronic band structure of materials to show the energy ranges an electron is allowed, with the band gap showing forbidden zones that basically block the flow of current. Spin-orbit coupling accounts for the electromagnetic interactions between electron's spin and magnetic field generated from the electron's motion around the nucleus.

"We found a very convenient method to control the topological phase transition in these quantum spin Hall interlayers."
Xiaofeng Qian, Assistant Professor in the Department of Materials Science and Engineering at Texas A&M University.

The complexity lies in the details of these interactions, for which Qian applied many-body perturbation theory with the GW approximation, a state-of-the-art first principles method, to calculate the quasiparticle electronic structures for electrons and holes. The 'G' is short for Green's Function and 'W' for screened Coulomb interaction, Qian explained.

"In order to carry out these calculations to obtain reasonable convergence in the results, we have to use 96 cores, sometimes even more," Qian said. "And then we need them for 24 hours. The Stampede computer is very efficient and powerful. The work that we have been showing is not just one material; we have several other materials as well as different conditions. In this sense, access to the resources, especially Stampede, is very helpful to our project."

The big picture for Qian and his colleagues is the hunt for new kinds of materials with extraordinarily useful properties. Their target is room-temperature quantum spin Hall insulators, which are basically near-two-dimensional materials that block current flow everywhere except along their edges. "Along the edges you have the so-called spin up electron flow in one direction, and at the same time you have spin down electrons and flows away in the opposite direction," Qian explained. "Basically, you can imagine, by controlling the injection of charge carriers, one can come up with spintronics, or electronics."

The scientists in this work proposed a topological field-effect transistor, made of sheets of hexagonal boron interlaced with sheets of TMDC. "We found a very convenient method to control the topological phase transition in these quantum spin Hall interlayers," Qian said. "This is very important because once we have this capability to control the phase transition, we can design some electronic devices that can be controlled easily through electrical fields."

Media Contact: Faith Singer-Villalobos faith@tacc.utexas.edu 512-232-5771

Quantum spin Hall effect in two-dimensional transition metal dichalcogenides. More about this image and story at Nanotechnology Today - http://nanotechnologytoday.blogspot.com/2015/03/quantum-spin-hall-effect-in-two.html

Exotic states materialize with supercomputers. Materials with novel electrical properties discovered using XSEDE computational resources Stampede and Lonestar supercomputers of TACC.

Scientists used supercomputers to find a new class of materials that possess an exotic state of matter known as the quantum spin Hall effect. The researchers published their results in the journal Science in December 2014, where they propose a new type of transistor made from these materials.

69 comments:

21st Century Software Solutions said...

Ab INITIO Ab INITIO Training "Ab INITIO Online Training
Introduction to Ab initio
Ab initio Architecture (Co-operation system, GDE, EME)
Sandbox creation, check-in and check-out.
How do you develop a graph and what are the pre-requisites for graph creation
Explaining different classes of Ab initio components and their usage
Transform Components" more… Online Training- Corporate Training- IT Support U Can Reach Us On +917386622889 - +919000444287 http://www.21cssindia.com/courses/abinitio-online-training-16.html

Anonymous said...

Nice post on Hall effect. But please tell me what is the use of these quantum spin Hall insulators?

Henry Ford

Nanoday.com

Unknown said...

Great article ...Thanks for your great information, the contents are quiet interesting. I will be waiting for your next post.
latest computer technologies

Maani kamili said...

Really, these quotes are the holistic approach towards mindfulness. In fact, all of your posts are. Proudly saying I’m getting fruitfulness out of it what you write and share. Thank you so much to both of you.

Digital marketing company in Chennai

Unknown said...

I simply want to tell you that I’m all new to blogs and truly liked you’re blog site. Very likely I’m likely to bookmark your site .You surely come with remarkable articles. Cheer for sharing your website page.
Cara Mengatasi Alergi Transfusi Darah
Cara Menurunkan Trombosit Tinggi
Cara Menurunkan Leukosit Tinggi Pada Anak

Unknown said...

Good Job Sir,
your website is very New Technology informative. i am really impress your efficiency.

Ancy merina said...
This comment has been removed by the author.
vin.bit.786 said...

Blockchain is the network who operates your digital coin i.e. cryptocurrency or bitcoin. So all your money that is present in blockchain wallet or account is considered as BLOCKCHAIN funds. Visit the given link for more. Withdraw bitcoin from blockchain
Thank You

اسمر المصري said...

شركة مكافحة حشرات بحائل

رجب البرنس said...



بسم الله الرحمن الرحيم نحن فى شركة الكمال نقوم بجميع خدمات نقل العفش والاساس بافض الطرق تحت اشراف

فريق كبير مدرب على اعلى مستوى من المستويات مع الفك والتركيب
شركة نقل اثاث بالطائف
شركة نقل اثاث بجازان
شركة نقل اثاث بحائل
شركة نقل اثاث ونقل عفش بحائل
والسلامة عليكم ورحمة الله وبركاته



Pankaj Singh said...

Visit for Website Designing & Development Company at Ogen Infosystem.
PPC Company in Delhi

Appslure said...

Thanks for sharing such a great blog... I am impressed with you taking time to post a nice info.
Website Development Company in Delhi
Website Designing Company in Delhi
Mobile App Development Company
Mobile App Development Company in India

Yashaswi Choudhary said...

Thanks for posting this article. I really loved while reading it.
technology write for us

Seema Singh said...

Thanks a lot for the information.
canon printer support phone number
hp printer support number
epson printer support phone number
canon customer service phone number
epson printer customer service number
hp printer customer service phone number

Wilda Jones said...

Microsoft edge support
Mozilla Firefox Support Phone Number
Quickbooks Support Phone Number
pogo games support phone number
yahoo mail customer service phone number

Bello Rock said...

free llm mock test
llb test series
llm entrance test
free clat mock test

secretmasth said...

wonderful your blog good information your blog please visit
honeymoon packages in andaman
andaman tour packages
andaman holiday packages
andaman tourism package
family tour package in andaman
laptop service center in chennai
Math word problem solver
Math problem solver
Math tutor near me
web design company in chennai
website designers in chennai
web development company in chennai
website designing company in chennai

Pankaj Singh said...

Thanks dear for such amazing blog sharing with us. Visit our page to get the best Website Designing and Development Services in Delhi.
Website Designing Company in Delhi

Poojarao said...

Rice Bags Manufacturers
Pouch Manufacturers
wall putty bag manufacturers

Poojarao said...

we have provide the best fridge repair service.
fridge repair in faridabad
Videocon Fridge Repair in Faridabad
Whirlpool Fridge Repair in Faridabad
Washing Machine Repair in Noida
godrej washing machine repair in noida
whirlpool Washing Machine Repair in Noida
IFB washing Machine Repair in Noida
LG Washing Machine Repair in Noida

Poojarao said...

Bali Honeymoon Packages From Delhi
Bali Honeymoon Packages From Chennai
Hong Kong Packages From Delhi
Europe Packages from Delhi
Bali Honeymoon Packages From Bangalore
Bali Honeymoon Packages From Mumbai
Maldives Honeymoon Packages From Bangalore
travel company in Delhi

Poojarao said...

we have provide the best ppc service.
ppc company in gurgaon
website designing company in Gurgaon
PPC company in Noida

Mutual Fundwala said...

Nice blog, Get the latest mutual fund investment schemes and performance of the mutual fund schemes.
Mutual Funds India

Kala Kutir said...

You are written amazing content in your blog. If you are need for 3 page parties and functions, visit our page Lifestyle Magazine.
Lifestyle Magazine India

Chiến SEOCAM said...

Болашақта сізде қызықты және қызықты мақалалар пайда болады деп сенемін. Бөлісу үшін сіздерге үлкен рахмет.

Phối chó bull pháp

Phối giống chó Corgi

Phối chó Pug

Phối giống cho Pug

Unknown said...

Bitcoin to bank account 100% trusted platform where you can transfer you digital currency anytime anywhere. Do not waste your time just visit for more details

Unknown said...

If you want to break you marriage so you will do this Dua to break unlawful marriage

bitcoin to bank account said...

bitcoin to bank account is direct exchange website where you do not need to find customer and no need to negotiate for price as you are being offered highest possible rate in the market.

Asset Finance And Leasing said...

The skillful team of Asset Finance and Leasing Technologies provides global IT
and business application solutions that include credit and finance portfolio management systems,
SAP consulting, custom development, systems integration and technical services.

Swimming Pool Contractors said...

Our Expert Swimming pool contractors works with a client to design a pool and then arranges for the installation of the pool.
This contractor orders the materials and hires and supervises the subcontractors that actually install the pool.

impressbss said...

Like!! Really appreciate you sharing this blog post.Really thank you! Keep writing.

Just Info said...

Thanks dear for sharing such an informative blog. Visit Kalakutir for the best School Bus Painting and Fleet Painting Services in Delhi, India.
School Bus Painting

Ray Hager said...

The most secure and most suggested site, Bitcoin to paypal which gives you the chance to change over your bitcoins into genuine money without paying even a penny and free of any inconvenience.

al ghadeer said...

شركة عزل فوم بحفر الباطن
شركة عزل فوم بجازان
شركة عزل فوم بابها
شركة عزل فوم بخميس مشيط
شركة عزل فوم بنجران

AllHelplineNumber said...

By providing tech supports to our customers we are not only helping them but indirectly we are also making our self-worthy of their investments and supports. We are providing our Gmail tech support phone number 1800-382-3046 to our customers and hoping that it will make better connection as well as they will be able to find solutions from our side.

jack said...

Thanks for sharing this great piece of information. Do check Enterprise Technology Review

All Customer Service Number said...

Click on the link and get assistance from the expert's to your problem.
www.office.com/setup
Office.com/setup
www.norton.com/setup
Norton.com/setup

Prof. Saira said...

hi dear thanks for this good article keep it up







Diagnostic Tests for Breast Cancer

.

Diagnostic Tests for Breast Cancer

.

Breast Cancer: Risk Factors and Prevention

.

Enzyme Technology: Application and Commercial Production

.

Important Applications of Microbiology:

,



Important Applications of Microbiology


,



SILICONES AND THEIR IMPORTANT INDUSTRIAL APPLICA


,

CARBIDES, THEIR TYPES, SYNTHESIS AND INDUSTRIAL APPLICATIONS

.

NANOMATERIALS, THEIR PROPERTIES, SYNTHESIS AND APPLICATION



Review on air pollution And control measures

şevki said...

xnxx
milf porno
Katja Krasavice Porno
porno

WebCodexIT said...

Your web design is as important as a soul is considered for the body. Your web design enables you to create the theme that serves to be the foundation of your website. codeaze

Pradeep Appslure said...

App development company in mumbai

steve said...

HP printer technical support number to get resolution of any Problem Related to HP Printer. We are always availabe for your Support 365 days
Hp Toll Free Number
HP Printer Support
HP Laptop Customer Service

steve said...

Download and install and office setup from
Office.com/setup

hagward said...

Looking for best DASH to BTC converter site, join us and get best services to convert, exchange, buy or sell dash coin. Transfer your dash cryptocurrency everywhere in the world with this amazing dash exchange platform. Visit this site for more details.

Ida F. Breton said...

https://scioly.org/forums/memberlist.php?mode=viewprofile&u=61575
https://www.funadvice.com/gregoight
https://www.feedsfloor.com/profile/creative-health-cart-reviews
https://www.speedrun.com/user/gregoight
https://yarabook.com/read-blog/36958
https://m.mydigoo.com/forums-topicdetail-121220.html
https://kpopselca.com/gregoight
https://www.prakard.com/viewtopic.php?f=5936&t=7327585
http://www.servinord.com/phpBB2/profile.php?mode=viewprofile&u=165327
https://addons.wpforo.com/community/profile/gregoight/

bestieltscoachingindwarka said...

Usually I never comment on blogs but your article is so convincing that I never stop myself to say something about it. You’re doing a great job Man,Keep it up.
Best uk education consultants in delhi
ielts coaching in gurgaon

Maerouf said...

تصميم مواقع
تصميم موقع الكترونى
برمجة تطبيقات الجوال
حجز دومين سعودى
تصميم موقع حراج
سيرفر

الرياض
تصميم تطبيقات الجوال
دومين
استضافة سعودية

Max Rusel said...

This is a great post. Your Blog the very informative, I have learned some information about your blog. Visit here Software development company USA.

Kartik Web Technology said...

If you looking best seo company in gurgaon so your search ends here because we are top class seo service provider company in city. Lots of customers are happy through our services. Visit our website :- http://www.kartikwebtechnology.com

website designing company Web Development in Gurgaon SEO Service Company Gurgaon Graphics Designing Gurgaon SMO Company in Gurgaon Pay Per Click Services in Gurgaon

whatsapp plus themes said...

putlocker

Field engineer said...

hi

Thamos Liam said...

All the information given on the website would make it easy for the people to understand the exact workings of the Swimming pool filtration plant.

clear ion said...

I was looking around for help as I am planning the installation of the Effluent Treatment Plant at my business unit, thanks to the website now everything is very clear for me.

Thamos Liam said...

If you facing some problem related to yahoo so please click on yahoo service then you can ger easily help from yahoo
yahoo customer service contact number UK
yahoo support number uk
yahoo contact number uk

Thamos Liam said...

This website is perfect for designing the Swimming pool filtration plant. Here, this plant is designed with the utmost care and attention to ensure its excellent performance. You also can know its complete working procedure from here.

Jacob Ethan said...

Thanks for writing this blog. It is very much informative and at the same time useful for me. Tutors India is a pioneer in providing academic writing services for the past 15 years.

vishyattechnologies said...

Vishyat Technologies offers Website development, SEO, PPC, Backlink Building, Content Development, Content Marketing, Conversion Rate Optimization, Email Marketing, Online Reputation Management, SEO Company in Faridabad, SEO Company in Noida, Brand Reputation Management, Hospital Reputation Management, Web Analytics and Internet Marketing. Vishyat Technologies optimizes your site, withor set up an extensive social media presence for you. We offer great quality content for your website and effective social media marketing campaigns. We also offer SEO Reseller services or SEO Outsourcing services to our clients in US, UK, Australia, Canada and Middle-East. You can check how’s your keyword ranking using a Rank checker tool on our website.
Website: http://www.vishyat.com
Email: contact(at)vishyat.com
Contact: +91-935-461-6193, +917827890148

vishyattechnologies said...

Much useful information,ty for sharing.
To rank your website or domain contact us
Vishyat Technologies is one of the best Digital Marketing and SEO company in Chandigarh. Our expert SEO services in Chandigarhhave helped a lot of business get better online exposure. SEO services Company in Amritsar,
Seo Company In Punjab, SEO company in India, SEO COMPANY IN GURGAON

Vishyat Technologies offers Website development, SEO, PPC, Backlink Building, Content Development, Content Marketing, Conversion Rate Optimization, Email Marketing, Online Reputation Management, SEO Company in Faridabad, SEO Company in Noida, Brand Reputation Management, Hospital Reputation Management, Web Analytics and Internet Marketing. Vishyat Technologies optimizes your site, withor set up an extensive social media presence for you. We offer great quality content for your website and effective social media marketing campaigns. We also offer SEO Reseller services or SEO Outsourcing services to our clients in US, UK, Australia, Canada and Middle-East. You can check how’s your keyword ranking using a Rank checker tool on our website.
Website: http://www.vishyat.com
Email: contact(at)vishyat.com
Contact: +91-935-461-6193, +917827890148

AA said...

شركة تنظيف منازل ام القيوين
شركة تنظيف منازل ابوظبي
شركة تنظيف منازل الشارقة
شركة تنظيف منازل العين
شركة تنظيف منازل الفجيرة
شركة تنظيف منازل دبي
شركة تنظيف منازل رأس الخيمة
شركة تنظيف منازل عجمان

AA said...

شركة تنظيف منازل في دبي
شركة تنظيف منازل في ابوظبي
شركة تنظيف منازل في الشارقة
شركة تنظيف منازل في ام القيوين
شركة تنظيف منازل في العين
شركة تنظيف منازل في الفجيرة
شركة تنظيف منازل في رأس الخيمة
شركة تنظيف منازل في عجمان

AA said...

شركة تنظيف كنب في ابوظبي
شركة تنظيف كنب في أم القوين
شركة تنظيف كنب في الشارقة
شركة تنظيف كنب في العين
شركة تنظيف كنب في الفجيرة
شركة تنظيف كنب في دبي
شركة تنظيف كنب في رأس الخيمة
شركة تنظيف كنب في عجمان

AA said...

شركة تنظيف كنب ابو ظبي
شركة تنظيف كنب ام القيوين
شركة تنظيف كنب الشارقة
شركة تنظيف كنب العين
شركة تنظيف كنب الفجيرة
شركة تنظيف كنب دبي
شركة تنظيف كنب رأس الخيمة
شركة تنظيف كنب عجمان

AA said...

شركة تنظيف في أبوظبي
شركة تنظيف في ام القيوين
شركة تنظيف في الشارقة
شركة تنظيف في العين
شركة تنظيف في الفجيرة
شركة تنظيف في دبي
شركة تنظيف في رأس الخيمة
شركة تنظيف في عجمان

AA said...

شركة تنظيف خزانات مياة بالشارقة
شركة تنظيف خزانات مياة بأبوظبي
شركة-تنظيف-خزانات-مياة-بالفجيرة
شركة تنظيف خزانات مياة بالعين

AA said...

شركة تغليف عفش في الكويت
شركة تغليف عفش في الاحمدي
شركة تغليف عفش في حولي
شركة تغليف عفش في الفروانية
شركة تغليف عفش في العاصمة
شركة تغليف عفش في الجهراء

AA said...

شركة تغليف عفش في المنطقة العاشرة
شركة تغليف عفش في مبارك الكبير
شركة نقل عفش في الكويت
شركة نقل عفش في الاحمدي
شركة نقل عفش في حولي

Quickbooks Phone Number said...

Lockdown is running in the whole country due to coronavirus, in such an environment we are committed to provide the best solutions for QuickBooks Support Phone Number. Know how to fix quickbooks for Mac support phone number to get in touch. Dial : +1-855-533-6333.

Unknown said...

QuickBooks Payroll Error 12007 is a commonly occurring error that occurs while downloading the payroll or QuickBooks Desktop.Then, immediately dial our Qb experts at 1-855-662-2O4O for effective solution.

247quickbookssupport said...

Demanding advanced solutions to your tech issues? Don’t worry!! Simply dial our QuickBooks POS Support Contact Number +1(844)233-3033 and get all your queries settled simultaneously.Our experts are skilled & competent enough to handle any type of complex & non-complex doubts.

Post a Comment