Xiaodong Xu

Publications580
h-index71
Citations32,876
Highly Influential Citations317
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Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides.
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… Expand
Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit
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… Expand
Spin and pseudospins in layered transition metal dichalcogenides
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… Expand
Optical generation of excitonic valley coherence in monolayer WSe2.
TLDR
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. Expand
Electrical control of neutral and charged excitons in a monolayer semiconductor.
TLDR
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. Expand
Single quantum emitters in monolayer semiconductors.
  • Yu-Ming He, Genevieve Clark, +9 authors Jian-Wei Pan
  • Physics, Medicine
  • Nature nanotechnology
  • 10 November 2014
TLDR
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. Expand
Supplementary Materials Magnetic Control of Valley Pseudospin in Monolayer WSe2
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… Expand
Lateral heterojunctions within monolayer MoSe2-WSe2 semiconductors.
TLDR
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. Expand
Electrically tunable excitonic light-emitting diodes based on monolayer WSe2 p-n junctions.
TLDR
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. Expand
Electrical control of second-harmonic generation in a WSe2 monolayer transistor.
TLDR
This study reports a mechanism to electrically control second-order optical nonlinearities in monolayer WSe₂, an atomically thin semiconductor and paves the way towards a new platform for chip-scale, electrically tunable nonlinear optical devices based on two-dimensional semiconductors. Expand
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