307 citations · 1.8k across the 30 of their papers we have counts for
18 papers · 1 filter
Ultrafast photo-thermoelectric currents in graphene junctions in the mid-infrared
Nina Pettinger, Michel Panhans, Johannes Schmuck +8
Graphene is widely recognized for its ultrafast and broadband photocurrent response, but whether the broadband ultrafast characteristics are preserved at mid-infrared wavelengths w…
Zero-phonon line emission of single photon emitters in helium-ion treated MoS
Katja Barthelmi, Tomer Amit, Mirco Troue +13
We explore the zero-phonon line of single photon emitters in helium-ion treated monolayer MoS, which are currently understood in terms of single sulfur-site vacancies. By compa…
Creation and Microscopic Origins of Single-Photon Emitters in Transition Metal Dichalcogenides and Hexagonal Boron Nitride
Amedeo Carbone, Diane-Pernille Bendixen-Fernex de Mongex, Arkady V. Krasheninnikov +6
We highlight recent advances in the controlled creation of single-photon emitters in van der Waals materials and in the understanding of their atomistic origin. We focus on quantum…
Quantifying the creation of negatively charged boron vacancies in He-ion irradiated hexagonal boron nitride
Amedeo Carbone, Ilia D. Breev, Johannes Figueiredo +10
Hexagonal boron nitride (hBN) hosts luminescent defects possessing spin qualities compatible with quantum sensing protocols at room temperature. Vacancies, in particular, are readi…
Spectrally resolved far-field emission pattern of single photon emitters in MoS2
Katja Barthelmi, Tomer Amit, Lukas Sigl +9
We explore the optical dipole orientation of single photon emitters in monolayer MoS2 as produced by a focused helium ion beam. The single photon emitters can be understood as sing…
Ultra-Sensitive Extinction Measurements of Optically Active Defects in Monolayer MoS
Florian Sigger, Ines Amersdorffer, Alexander Hötger +12
We utilize cavity-enhanced extinction spectroscopy to directly quantify the optical absorption of defects in MoS generated by helium ion bombardment. We achieve hyperspectral i…
Spin-defect characteristics of single sulfur vacancies in monolayer
Alexander Hötger, Tomer Amit, Julian Klein +15
Single spin defects in 2D transition-metal dichalcogenides are natural spin-photon interfaces for quantum applications. Here we report high-field magneto-photoluminescence spectros…
Berry curvature-induced local spin polarisation in gated graphene/WTe heterostructures
Lukas Powalla, Jonas Kiemle, Elio J. König +6
Full experimental control of local spin-charge interconversion is of primary interest for spintronics. Heterostructures combining graphene with a strongly spin-orbit coupled two-di…
How Substitutional Point Defects in Two-Dimensional WS Induce Charge Localization, Spin-Orbit Splitting, and Strain
Bruno Schuler, Jun-Ho Lee, Christoph Kastl +13
Control of impurity concentrations in semiconducting materials is essential to device technology. Because of their intrinsic confinement, the properties of two-dimensional semicond…
Scalable single-photon sources in atomically thin MoS2
Julian Klein, Lukas Sigl, Samuel Gyger +13
Real-world quantum applications, eg. on-chip quantum networks and quantum cryptography, necessitate large scale integrated single-photon sources with nanoscale footprint for modern…
Characterizing Transition-Metal Dichalcogenide Thin-Films using Hyperspectral Imaging and Machine Learning
Brian Shevitski, Christopher T. Chen, Christoph Kastl +4
Atomically thin polycrystalline transition-metal dichalcogenides (TMDs) are relevant to both fundamental science investigation and applications. TMD thin-films present uniquely dif…
Electrically driven photon emission from individual atomic defects in monolayer WS2
Bruno Schuler, Katherine A. Cochrane, Christoph Kastl +7
Optical quantum emitters are a key component of quantum devices for metrology and information processing. In particular, atomic defects in 2D materials can operate as optical quant…
Resonant and Bound States of Charged Defects in Two-Dimensional Semiconductors
Martik Aghajanian, Bruno Schuler, Katherine A. Cochrane +6
A detailed understanding of charged defects in two-dimensional semiconductors is needed for the development of ultrathin electronic devices. Here, we study negatively charged accep…
Blue-Light-Emitting Color Centers in High-Quality Hexagonal Boron Nitride
Brian Shevitski, S. Matt Gilbert, Christopher T. Chen +8
Light emitters in wide band gap semiconductors are of great fundamental interest and have potential as optically addressable qubits. Here we describe the discovery of a new color c…
Switchable quantized conductance in topological insulators revealed by the Shockley-Ramo theorem
Paul Seifert, Marinus Kundinger, Gang Shi +5
Crystals with symmetry-protected topological order, such as topological insulators, promise coherent spin and charge transport phenomena even in the presence of disorder at room te…
Quantized one-dimensional edge channels with strong spin-orbit coupling in 3D topological insulators
Christoph Kastl, Paul Seifert, Xiaoyue He +3
A strong coupling between the electron spin and its motion is one of the prerequisites of spin-based data storage and electronics. A major obstacle is to find spin-orbit coupled ma…
Local photocurrent generation in thin films of the topological insulator Bi2Se3
C. Kastl, T. Guan, X. Y. He +3
We report on the optoelectronic properties of thin films of Bi2Se3 grown by molecular beam epitaxy. The films are patterned into circuits with typical extensions of tens of microns…
Enlarged magnetic focusing radius of photoinduced ballistic currents
Markus Stallhofer, Christoph Kastl, Marcel Brändlein +5
We exploit GaAs-based quantum point contacts as mesoscopic detectors to analyze the ballistic flow of photogenerated electrons in a two-dimensional electron gas at a perpendicular…