Zobrazeno 1 - 10
of 470
pro vyhledávání: '"A. Yagodkin"'
Autor:
Yücel, Oguzhan, Yagodkin, Denis, Kirchhof, Jan N., Kumar, Abhijeet, Dewambrechies, Adrian, Kovalchuk, Sviatoslav, Yu, Yufeng, Bolotin, Kirill I.
We explore strain-activated emission centers formed by atomic force microscopy (AFM) indentation in monolayer \ce{WSe2} on a flexible polymer substrate. In the indented areas, we observe sharp new photoluminescence (PL) peaks characterized by subline
Externí odkaz:
http://arxiv.org/abs/2402.11128
Autor:
Kumar, Abhijeet, Yagodkin, Denis, Rosati, Roberto, Bock, Douglas J, Schattauer, Christoph, Tobisch, Sarah, Hagel, Joakim, Höfer, Bianca, Kirchhof, Jan N, López, Pablo Hernández, Burfeindt, Kenneth, Heeg, Sebastian, Gahl, Cornelius, Libisch, Florian, Malic, Ermin, Bolotin, Kirill I
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 weak coupling to light. The identification of an excitons' valley char
Externí odkaz:
http://arxiv.org/abs/2312.07332
Autor:
Abhijeet M. Kumar, Denis Yagodkin, Roberto Rosati, Douglas J. Bock, Christoph Schattauer, Sarah Tobisch, Joakim Hagel, Bianca Höfer, Jan N. Kirchhof, Pablo Hernández López, Kenneth Burfeindt, Sebastian Heeg, Cornelius Gahl, Florian Libisch, Ermin Malic, Kirill I. Bolotin
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-8 (2024)
Abstract Intervalley excitons with electron and hole wavefunctions residing in different valleys determine the long-range transport and dynamics observed in many semiconductors. However, these excitons with vanishing oscillator strength do not direct
Externí odkaz:
https://doaj.org/article/8bdb511c5a7748e3bcc5df43a7866d52
Autor:
Yagodkin, Denis, Ankerhold, Elias, Kumar, Abhijeet, Richter, Johanna, Watanabe, Kenji, Taniguchi, Takashi, Gahl, Cornelius, Bolotin, Kirill. I.
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 ultrafast photocurrent technique (trPC) to probe the formation dynami
Externí odkaz:
http://arxiv.org/abs/2302.14669
Autor:
Kirchhof, Jan N., Yu, Yuefeng, Yagodkin, Denis, Stetzuhn, Nele, de Araújo, Daniel B., Kanellopulos, Kostas, Manas-Valero, Samuel, Coronado, Eugenio, van der Zant, Herre, Reich, Stephanie, Schmid, Silvan, Bolotin, Kirill I.
Nanomechanical spectroscopy (NMS) is a recently developed approach to determine optical absorption spectra of nanoscale materials via mechanical measurements. It is based on measuring changes in the resonance frequency of a membrane resonator vs. the
Externí odkaz:
http://arxiv.org/abs/2301.12211
Autor:
Kirchhof, Jan N., Yu, Yuefeng, Antheaume, Gabriel, Gordeev, Georgy, Yagodkin, Denis, Elliott, Peter, de Araújo, Daniel B., Sharma, Sangeeta, Reich, Stephanie, Bolotin, Kirill I.
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 suspended 2D material integrated into a nanomechanical resonator illu
Externí odkaz:
http://arxiv.org/abs/2203.07025
Autor:
Yagodkin, D, Greben, K, Eljarrat, A, Kovalchuk, S, Ghorbani-Asl, M, Jain, M, Kretschmer, S, Severin, N, Rabe, J P, Krasheninnikov, A V, Koch, C T, Bolotin, K I
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 external molecules on the material surface. The signature of an exciton as
Externí odkaz:
http://arxiv.org/abs/2105.13711
Autor:
Kumar, Abhijeet, Yagodkin, Denis, Stetzuhn, Nele, Kovalchuk, Sviatoslav, Melnikov, Alexey, Elliott, Peter, Sharma, Sangeeta, Gahl, Cornelius, Bolotin, Kirill I.
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 heterostructure ${\text{MoS}_{2}-\text{MoSe}_{2}}$ to study optical pumping o
Externí odkaz:
http://arxiv.org/abs/2103.09934
Autor:
Yagodkin, Denis, Nadvornik, Lukas, Gueckstock, Oliver, Gahl, Cornelius, Kampfrath, Tobias, Bolotin, Kirill I.
We use the terahertz (THz) emission spectroscopy to study femtosecond photocurrent dynamics in the prototypical 2D semiconductor, transition metal dichalcogenide MoSe$_2$. We identify several distinct mechanisms producing THz radiation in response to
Externí odkaz:
http://arxiv.org/abs/2008.12203
Autor:
Pablo Hernández López, Sebastian Heeg, Christoph Schattauer, Sviatoslav Kovalchuk, Abhijeet Kumar, Douglas J. Bock, Jan N. Kirchhof, Bianca Höfer, Kyrylo Greben, Denis Yagodkin, Lukas Linhart, Florian Libisch, Kirill I. Bolotin
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-9 (2022)
Mechanical strain is a powerful tuning knob for excitons in two-dimensional semiconductors. Here, the authors find that under the application of strain, dark and localized excitons in monolayer WSe2 are brought into energetic resonance, forming a new
Externí odkaz:
https://doaj.org/article/e0d2854796d04ac8829185d361ea9b87