Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides.
- Di Xiao, Gui-Bin Liu, W. Feng, Xiaodong Xu, W. Yao
- PhysicsPhysical Review Letters
- 14 December 2011
We show that inversion symmetry breaking together with spin-orbit coupling leads to coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides, making possible controls…
Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit
- Bevin Huang, Genevieve Clark, Xiaodong Xu
- Physics, Materials ScienceNature
- 17 March 2017
Since the discovery of graphene, the family of two-dimensional materials has grown, displaying a broad range of electronic properties. Recent additions include semiconductors with spin–valley…
Spin and pseudospins in layered transition metal dichalcogenides
- Xiaodong Xu, W. Yao, Di Xiao, T. Heinz
- Physics, Materials Science
- 1 May 2014
Understanding the physics of two-dimensional materials beyond graphene is of both fundamental and practical interest. Recent theoretical and experimental advances uncover the interplay between real…
Optical generation of excitonic valley coherence in monolayer WSe2.
- Aaron M. Jones, Hongyi Yu, Xiaodong Xu
- PhysicsNature Nanotechnology
- 21 March 2013
The ability to address coherence, in addition to valley polarization, is a step forward towards achieving quantum manipulation of the valley index necessary for coherent valleytronics.
Electrical control of neutral and charged excitons in a monolayer semiconductor.
- J. Ross, Sanfeng Wu, Xiaodong Xu
- PhysicsNature Communications
- 1 November 2012
This work reports the unambiguous observation and electrostatic tunability of charging effects in positively charged, neutral and negatively charged excitons in field-effect transistors via photoluminescence and finds the charging energies for X(+) and X(-) to be nearly identical implying the same effective mass for electrons and holes.
Single quantum emitters in monolayer semiconductors.
- Y. He, Genevieve Clark, Jian-Wei Pan
- PhysicsNature Nanotechnology
- 10 November 2014
A new class of SQEs based on excitons that are spatially localized by defects in 2D tungsten-diselenide (WSe2) monolayers is reported, which could give rise to practical advantages in quantum-information processing, such as an efficient photon extraction and a high integratability and scalability.
Valleytronics in 2D materials
- J. Schaibley, Hongyi Yu, Xiaodong Xu
- Geology
- 23 August 2016
The energy extrema of an electronic band are referred to as valleys. In 2D materials, two distinguishable valleys can be used to encode information and explore other valleytronic applications.
Supplementary Materials Magnetic Control of Valley Pseudospin in Monolayer WSe2
- G. Aivazian, Z. Gong, Xiaodong Xu
- Physics
- 9 July 2014
Supplementary Text S1. Computing the valley Zeeman effect in multiple samples. The peak splitting due to the valley Zeeman effect is small compared to the width of the photoluminescence (PL) peaks so…
Lateral heterojunctions within monolayer MoSe2-WSe2 semiconductors.
- Chunming Huang, Sanfeng Wu, Xiaodong Xu
- Physics, Materials ScienceNature Materials
- 1 December 2014
It is demonstrated that seamless high-quality in-plane heterojunctions can be grown between the 2D monolayer semiconductors MoSe2 and WSe2, and their structure is an undistorted honeycomb lattice in which substitution of one transition metal by another occurs across the interface.
Electrically tunable excitonic light-emitting diodes based on monolayer WSe2 p-n junctions.
- J. Ross, P. Klement, Xiaodong Xu
- PhysicsNature Nanotechnology
- 5 December 2013
Electroluminescence from lateral p-n junctions in monolayer WSe2 induced electrostatically using a thin boron nitride support as a dielectric layer with multiple metal gates beneath is reported, which has the required ingredients for new types of optoelectronic device, such as spin- and valley-polarized light-emitting diodes, on-chip lasers and two-dimensional electro-optic modulators.
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