Observation of intervalley quantum interference in epitaxial monolayer tungsten diselenide

Nature Communications
Hongjun LiuMaohai Xie

Abstract

The extraordinary electronic structures of monolayer transition metal dichalcogenides, such as the spin-valley-coupled band edges, have sparked great interest for potential spintronic and valleytronic applications based on these two-dimensional materials. In this work, we report the experimental observation of quasi-particle interference patterns in monolayer WSe2 using low-temperature scanning tunnelling spectroscopy. We observe intervalley quantum interference involving the Q valleys in the conduction band due to spin-conserving scattering processes, while spin-flipping intervalley scattering is absent. Our results establish unequivocally the presence of spin-valley coupling and affirm the large spin splitting at the Q valleys. Importantly, the inefficient spin-flipping scattering implies long valley and spin lifetime in monolayer WSe2, which is a key figure of merit for valley-spintronic applications.

References

Dec 15, 1994·Physical Review. B, Condensed Matter·P E Blöchl
Oct 15, 1996·Physical Review. B, Condensed Matter·G Kresse, J Furthmüller
Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Jul 14, 2007·Science·G M RutterJ A Stroscio
Oct 8, 1993·Science·M F CrommieD M Eigler
Jun 8, 2012·Nature Communications·Ting CaoJi Feng
Jun 19, 2012·Nature Nanotechnology·Kin Fai MakTony F Heinz
Jun 19, 2012·Nature Nanotechnology·Hualing ZengXiaodong Cui
Nov 8, 2012·Nature Nanotechnology·Qing Hua WangMichael S Strano
Aug 13, 2013·Nature Nanotechnology·Aaron M JonesXiaodong Xu
Dec 10, 2013·Physical Review Letters·Diana Y QiuSteven G Louie
Aug 26, 2014·Nature Communications·Nasser AlidoustM Zahid Hasan
Jul 17, 2015·Nature Communications·Ming-Hui ChiuLain-Jong Li
Oct 10, 2015·Physical Review Letters·Matthew YankowitzBrian J LeRoy

❮ Previous
Next ❯

Citations

Aug 19, 2016·ACS Applied Materials & Interfaces·Kleopatra Emmanouil AretouliAthanasios Dimoulas
Jul 6, 2017·ACS Applied Materials & Interfaces·Sukrit SucharitakulXuan P A Gao
Dec 21, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Lan ChenKehui Wu
Jan 18, 2018·Physical Review Letters·Shuai ZhangShiwei Wu
Oct 10, 2015·Physical Review Letters·Matthew YankowitzBrian J LeRoy
Apr 25, 2019·Science Advances·Terry Y T HungZhihong Chen
Jan 18, 2018·Nano Letters·Xiaotian ZhangJoan M Redwing
Dec 26, 2018·Nano Letters·Krystian NowakowskiPantelis Bampoulis
Jan 10, 2018·ACS Nano·Polychronis TsipasAthanasios Dimoulas
May 16, 2018·Nano Letters·Xiaopeng FanAnlian Pan

❮ Previous
Next ❯

Methods Mentioned

BETA
electron diffraction

Software Mentioned

Vienna Ab - initio Simulation Package ( VASP ) code

Related Concepts

Related Feeds

Cardiac Conduction System

The cardiac conduction system is a specialized tract of myocardial cells responsible for maintaining normal cardiac rhythm. Discover the latest research on the cardiac conduction system here.