74 citations · 174 across the 11 of their papers we have counts for
12 papers
Tunable magnons in a dual-gated 2D antiferromagnet
Nele Stetzuhn, Abhijeet M. Kumar, Sviatoslav Kovalchuk +12
The layered antiferromagnet CrSBr features magnons coupled to other quasiparticles, including excitons and polaritons, enabling their easy optical accessibility. In this work, we i…
Strain engineering of valley-polarized hybrid excitons in a 2D semiconductor
Abhijeet M. Kumar, Douglas J. Bock, Denis Yagodkin +11
Encoding and manipulating digital information in quantum degrees of freedom is one of the major challenges of today's science and technology. The valley indices of excitons in tran…
Excitons under large pseudomagnetic fields
Denis Yagodkin, Kenneth Burfeindt, Zakhar A. Iakovlev +7
Excitons in Transition Metal Dichalcogenides (TMDs) acquire a spin-like quantum number, a pseudospin, originating from the crystal's discrete rotational symmetry. Here, we break th…
Strain activation of localized states in WSe2
Oguzhan Yücel, Denis Yagodkin, Jan N. Kirchhof +5
Single-photon emission centers generated by controlled atomic force microscopy (AFM) indentation in monolayer WSe\(_2\) on a flexible polymer substrate are explored for application…
Strain fingerprinting of exciton valley character
Abhijeet Kumar, Denis Yagodkin, Roberto Rosati +13
Momentum-indirect excitons composed of electrons and holes in different valleys define optoelectronic properties of many semiconductors, but are challenging to detect due to their…
Probing the formation of dark interlayer excitons via ultrafast photocurrent
Denis Yagodkin, Elias Ankerhold, Abhijeet Kumar +5
Optically dark excitons determine a wide range of properties of photoexcited semiconductors yet are hard to access via conventional spectroscopies. Here, we develop a time-resolved…
Nanomechanical absorption spectroscopy of 2D materials with femtowatt sensitivity
Jan N. Kirchhof, Yuefeng Yu, Denis Yagodkin +9
Nanomechanical spectroscopy (NMS) is a recently developed approach to determine optical absorption spectra of nanoscale materials via mechanical measurements. It is based on measur…
Strain control of hybridization between dark and localized excitons in a 2D semiconductor
Pablo Hernández López, Sebastian Heeg, Christoph Schattauer +8
Mechanical strain is a powerful tuning knob for excitons, Coulomb-bound electron-hole complexes dominating optical properties of two-dimensional semiconductors. While the strain re…
Nanomechanical spectroscopy of 2D materials
Jan N. Kirchhof, Yuefeng Yu, Gabriel Antheaume +7
We introduce a nanomechanical platform for fast and sensitive measurements of the spectrally-resolved optical dielectric function of 2D materials. At the heart of our approach is a…
Extrinsic localized excitons in patterned 2D semiconductors
D Yagodkin, K Greben, A Eljarrat +9
We demonstrate a new localized excitonic state in patterned monolayer 2D semiconductors. This state is not associated with lattice disorder but is extrinsic, i.e. results from exte…
Spin/valley coupled dynamics of electrons and holes at the interface
Abhijeet Kumar, Denis Yagodkin, Nele Stetzuhn +6
The coupled spin and valley degrees of freedom in transition metal dichalcogenides (TMDs) are considered a promising platform for information processing. Here, we use a TMD heteros…
Ultrafast photocurrents in MoSe probed by terahertz spectroscopy
Denis Yagodkin, Lukas Nadvornik, Oliver Gueckstock +3
We use the terahertz (THz) emission spectroscopy to study femtosecond photocurrent dynamics in the prototypical 2D semiconductor, transition metal dichalcogenide MoSe. We ident…