Berend T. Jonker
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View article: High‐Temperature Single‐Photon Emission From Covalently Functionalized van der Waals Heterostructures
High‐Temperature Single‐Photon Emission From Covalently Functionalized van der Waals Heterostructures Open
Two‐dimensional (2D) transition metal dichalcogenides (TMDs) such as tungsten diselenide (WSe 2 ) are attractive nanomaterials for quantum information applications due to single‐photon emission (SPE) from intrinsic atomic defects. Defect a…
View article: Transfer of hexagonal boron nitride quantum emitters onto arbitrary substrates with zero thermal budget
Transfer of hexagonal boron nitride quantum emitters onto arbitrary substrates with zero thermal budget Open
The van der Waals material hexagonal boron nitride (hBN) has emerged as a promising candidate for hosting room temperature single-photon emitters (SPEs) for next-generation quantum technologies. However, the requirement of a high temperatu…
View article: Observation of interlayer plasmon polaron in graphene/WS2 heterostructures
Observation of interlayer plasmon polaron in graphene/WS2 heterostructures Open
View article: Ferroelectric modulation of quantum emitters in monolayer WS$_2$
Ferroelectric modulation of quantum emitters in monolayer WS$_2$ Open
Quantum photonics promises significant advances in secure communications, metrology, sensing and information processing/computation. Single photon sources are fundamental to this endeavor. However, the lack of high quality single photon so…
View article: Discovery of interlayer plasmon polaron in graphene/WS$_2$ heterostructures
Discovery of interlayer plasmon polaron in graphene/WS$_2$ heterostructures Open
Harnessing electronic excitations involving coherent coupling to bosonic modes is essential for the design and control of emergent phenomena in quantum materials [1]. In situations where charge carriers induce a lattice distortion due to t…
View article: Proximity-enhanced valley Zeeman splitting at the WS<sub>2</sub>/graphene interface
Proximity-enhanced valley Zeeman splitting at the WS<sub>2</sub>/graphene interface Open
The valley Zeeman physics of excitons in monolayer transition metal dichalcogenides provides valuable insight into the spin and orbital degrees of freedom inherent to these materials. Being atomically-thin materials, these degrees of freed…
View article: Proximity-enhanced valley Zeeman splitting at the WS$_2$/graphene interface
Proximity-enhanced valley Zeeman splitting at the WS$_2$/graphene interface Open
The valley Zeeman physics of excitons in monolayer transition metal dichalcogenides provides valuable insight into the spin and orbital degrees of freedom inherent to these materials. Being atomically-thin materials, these degrees of freed…
View article: Interlayer Exciton-Phonon Bound State in Bi2Se3/monolayer WS2 van der Waals Heterostructures
Interlayer Exciton-Phonon Bound State in Bi2Se3/monolayer WS2 van der Waals Heterostructures Open
The ability to assemble layers of two-dimensional (2D) materials to form permutations of van der Waals heterostructures provides significant opportunities in materials design and synthesis. Interlayer interactions provide a path to new pro…
View article: Control of the Schottky barrier height in monolayer WS2 FETs using molecular doping
Control of the Schottky barrier height in monolayer WS2 FETs using molecular doping Open
Developing controllable doping processes for two-dimensional (2D) semiconductors is critical to developing next-generation electronic and optoelectronic devices. Understanding the nature of the contacts is an essential step in realizing ef…
View article: Room-temperature oxygen transport in nano-thin BixOySez enables precision modulation of 2D materials
Room-temperature oxygen transport in nano-thin BixOySez enables precision modulation of 2D materials Open
Oxygen conductors and transporters are important to several consequential renewable energy technologies, including fuel cells and syngas production. Separately, monolayer transition metal dichalcogenides (TMDs) have demonstrated significan…
View article: Room-temperature oxygen transport in nano-thin BixOySez enables\n precision modulation of 2D materials
Room-temperature oxygen transport in nano-thin BixOySez enables\n precision modulation of 2D materials Open
Oxygen conductors and transporters are important to several consequential\nrenewable energy technologies, including fuel cells and syngas production.\nSeparately, monolayer transition metal dichalcogenides (TMDs) have demonstrated\nsignifi…
View article: Laser-Patterned Submicrometer Bi<sub>2</sub>Se<sub>3</sub>–WS<sub>2</sub> Pixels with Tunable Circular Polarization at Room Temperature
Laser-Patterned Submicrometer Bi<sub>2</sub>Se<sub>3</sub>–WS<sub>2</sub> Pixels with Tunable Circular Polarization at Room Temperature Open
Characterizing and manipulating the circular polarization of light is central to numerous emerging technologies, including spintronics and quantum computing. Separately, monolayer tungsten disulfide (WS2) is a versatile material…
View article: Nanoscale Optical Imaging of 2D Semiconductor Stacking Orders by Exciton-Enhanced Second Harmonic Generation
Nanoscale Optical Imaging of 2D Semiconductor Stacking Orders by Exciton-Enhanced Second Harmonic Generation Open
Second harmonic generation (SHG) is a nonlinear optical response arising exclusively from broken inversion symmetry in the electric-dipole limit. Recently, SHG has attracted widespread interest as a versatile and noninvasive tool for chara…
View article: Nanoscale Optical Imaging of 2D Semiconductor Stacking Orders by\n Exciton-Enhanced Second Harmonic Generation
Nanoscale Optical Imaging of 2D Semiconductor Stacking Orders by\n Exciton-Enhanced Second Harmonic Generation Open
Second harmonic generation (SHG) is a nonlinear optical response arising exclusively from broken inversion symmetry in the electric-dipole limit. Recently, SHG has attracted widespread interest as a versatile and noninvasive tool for chara…
View article: Stacking-Dependent Optical Properties in Bilayer WSe2
Stacking-Dependent Optical Properties in Bilayer WSe2 Open
The twist angle between the monolayers in van der Waals heterostructures provides a new degree of freedom in tuning material properties. We compare the optical properties of WSe2 homobilayers with 2H and 3R stacking using photoluminescence…
View article: Probing Electronic Structures of Monolayer WSe<sub>2</sub> Stacked with hBN Using Correlative Cathodoluminescence and Electron Energy-Loss Spectroscopy
Probing Electronic Structures of Monolayer WSe<sub>2</sub> Stacked with hBN Using Correlative Cathodoluminescence and Electron Energy-Loss Spectroscopy Open
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View article: Visualizing band structure hybridization and superlattice effects in twisted MoS$_2$/WS$_2$ heterobilayers
Visualizing band structure hybridization and superlattice effects in twisted MoS$_2$/WS$_2$ heterobilayers Open
A mismatch of atomic registries between single-layer transition metal dichalcogenides (TMDs) in a two dimensional van der Waals heterostructure produces a moiré superlattice with a periodic potential, which can be fine-tuned by introducing…
View article: Twist Angle-Dependent Atomic Reconstruction and Moiré Patterns in Transition Metal Dichalcogenide Heterostructures
Twist Angle-Dependent Atomic Reconstruction and Moiré Patterns in Transition Metal Dichalcogenide Heterostructures Open
Van der Waals layered materials, such as transition metal dichalcogenides (TMDs), are an exciting class of materials with weak interlayer bonding, which enables one to create so-called van der Waals heterostructures (vdWH). One promising a…
View article: TwistAngle-Dependent Atomic Reconstruction and MoirePatterns in Transition Metal Dichalcogenide Heterostructures
TwistAngle-Dependent Atomic Reconstruction and MoirePatterns in Transition Metal Dichalcogenide Heterostructures Open
Van der Waals layered
materials, such as transition metal dichalcogenides
(TMDs), are an exciting class of materials with weak interlayer bonding,
which enables one to create so-called van der Waals heterostructures
(vdWH). One promising a…
View article: Emergent electric field control of phase transformation in oxide superlattices
Emergent electric field control of phase transformation in oxide superlattices Open
View article: Continuous Wave Sum Frequency Generation and Imaging of Monolayer and Heterobilayer Two-Dimensional Semiconductors
Continuous Wave Sum Frequency Generation and Imaging of Monolayer and Heterobilayer Two-Dimensional Semiconductors Open
We report continuous-wave second harmonic and sum frequency generation from two-dimensional transition metal dichalcogenide monolayers and their heterostructures with pump irradiances several orders of magnitude lower than those of convent…
View article: Resonant optical Stark effect in monolayer WS2
Resonant optical Stark effect in monolayer WS2 Open
Breaking the valley degeneracy in monolayer transition metal dichalcogenides through the valley-selective optical Stark effect (OSE) can be exploited for classical and quantum valleytronic operations such as coherent manipulation of valley…
View article: Ultrafast Carrier Dynamics of Monolayer WS<sub>2</sub> via Broad-Band Time-Resolved Terahertz Spectroscopy
Ultrafast Carrier Dynamics of Monolayer WS<sub>2</sub> via Broad-Band Time-Resolved Terahertz Spectroscopy Open
We report on the ultrafast carrier dynamics of monolayer WS2 using broad-band time-resolved terahertz spectroscopy (TRTS). We find that upon photoexcitation, there is an increase in the conductivity. We attribute this photoinduced increase…
View article: Temperature dependent valley polarization in WS2 heterostructures
Temperature dependent valley polarization in WS2 heterostructures Open
View article: Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures
Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures Open
van der Waals heterostructures (vdWHs) leverage the characteristics of two-dimensional (2D) material building blocks to create a myriad of structures with unique and desirable properties. Several commonly employed fabrication strategies re…
View article: Electrical detection of current generated spin in topological insulator surface states: Role of interface resistance
Electrical detection of current generated spin in topological insulator surface states: Role of interface resistance Open
Current generated spin polarization in topological insulator (TI) surface states due to spin-momentum locking has been detected recently using ferromagnet/tunnel barrier contacts, where the projection of the TI spin onto the magnetization …
View article: Modeling electrical detection of current generated spin in topological insulator surface states
Modeling electrical detection of current generated spin in topological insulator surface states Open
Current generated spin polarization in topological insulator (TI) surface states due to spin-momentum locking has been detected recently using ferromagnet/tunnel barrier contacts, where the projection of the TI spin onto the magnetization …
View article: Electrical Detection of Charge-to-spin and Spin-to-Charge Conversion in a Topological Insulator Bi2Te3 Using BN/Al2O3 Hybrid Tunnel Barrier
Electrical Detection of Charge-to-spin and Spin-to-Charge Conversion in a Topological Insulator Bi2Te3 Using BN/Al2O3 Hybrid Tunnel Barrier Open
One of the most striking properties of three-dimensional topological insulators (TIs) is spin-momentum locking, where the spin is locked at right angles to momentum and hence an unpolarized charge current creates a net spin polarization. A…
View article: Double Indirect Interlayer Exciton in a MoSe<sub>2</sub>/WSe<sub>2</sub> van der Waals Heterostructure
Double Indirect Interlayer Exciton in a MoSe<sub>2</sub>/WSe<sub>2</sub> van der Waals Heterostructure Open
An emerging class of semiconductor heterostructures involves stacking discrete monolayers such as transition metal dichalcogenides (TMDs) to form van der Waals heterostructures. In these structures, it is possible to create interlayer exci…
View article: Imaging spin dynamics in monolayer WS <sub>2</sub> by time-resolved Kerr rotation microscopy
Imaging spin dynamics in monolayer WS <sub>2</sub> by time-resolved Kerr rotation microscopy Open
Monolayer transition metal dichalcogenides (TMD) have immense potential for future spintronic and valleytronic applications due to their two-dimensional nature and long spin/valley lifetimes. We investigate the origin of these long-lived s…