Second-harmonic imaging microscopy for time-resolved investigations of transition metal dichalcogenides
arXiv:1608.03434 · doi:10.1088/1361-648X/aba946
Abstract
Two-dimensional transition metal dichalcogenides (TMDC) have shown promise for various applications in optoelectronics and so-called valleytronics. Their operation and performance strongly depend on the stacking of individual layers. Here, optical second-harmonic generation (SHG) in imaging mode is shown to be a versatile tool for systematic time-resolved investigations of TMDC monolayers and heterostructures in consideration of the material's structure. Large sample areas can be probed without the need of any mapping or scanning. By means of polarization dependent measurements, the crystalline orientation of monolayers or the stacking angles of heterostructures can be evaluated for the whole field of view. Pump-probe experiments then allow to correlate observed transient changes of the second-harmonic response with the underlying structure. The corresponding time-resolution is virtually limited by the pulse duration of the used laser. As an example, polarization dependent and time-resolved measurements on mono- and multilayer MoS flakes grown on a SiO/Si(001) substrate are presented.
References in corpus (32)
- Electric Field Effect in Atomically Thin Carbon Films
- Atomically thin MoS2: A new direct-gap semiconductor
- Van der Waals heterostructures
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- Control of valley polarization in monolayer MoS2 by optical helicity
- Valley polarization in MoS2 monolayers by optical pumping
- Atomically thin p-n junctions with van der Waals heterointerfaces
- Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
- Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
- Tunable Photoluminescence of Monolayer MoS2 via Chemical Doping
- Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides
- Low-temperature photocarrier dynamics in monolayer MoS2
- Observation of Intense Second Harmonic Generation from MoS Atomic Crystals
- Evolution of Interlayer Coupling in Twisted MoS2 Bilayers
- Second harmonic microscopy of monolayer MoS2
- Determination of band alignment in the single layer MoS2/WSe2 heterojunction
- Ultrafast Dynamics of Defect-Assisted Electron-Hole Recombination in Monolayer MoS2
- Non-linear Optical Spectroscopy of Excited Exciton States for Efficient Valley Coherence Generation in WSe2 Monolayers
- Raman spectroscopy study of rotated double-layer graphene: Misorientation-angle dependence of electronic structure
- Electronic structures and optical properties of realistic transition metal dichalcogenide heterostructures from first principles
- Band Alignment of 2D Semiconductors for Designing Heterostructures with Momentum Space Matching
- Robust optical emission polarization in MoS2 monolayers through selective valley excitation
- Evidence for Fast Interlayer Energy Transfer in MoSe2/WS2 Heterostructures
- Anomalous light cones and valley optical selection rules of interlayer excitons in twisted heterobilayers
- Ultrafast and spatially resolved studies of charge carriers in atomically-thin molybdenum disulfide
- Hundredfold Enhancement of Light Emission via Defect Control in Monolayer Transition-Metal Dichalcogenides
- Valley Carrier Dynamics in Monolayer Molybdenum Disulphide from Helicity Resolved Ultrafast Pump-probe Spectroscopy
- Interfacial Charge Transfer Circumventing Momentum Mismatch at 2D van der Waals Heterojunctions
- Ultrafast transition between exciton phases in van der Waals heterostructures
- Surface Recombination Limited Lifetimes of Photoexcited Carriers in Few-Layer Transition Metal Dichalcogenide MoS2
- Interlayer coupling in commensurate and incommensurate bilayer structures of transition metal dichalcogenides
- Two-Dimensional Valley Electrons and Excitons in Noncentrosymmetric 3R MoS