Zobrazeno 1 - 10
of 238
pro vyhledávání: '"P, Ersfeld"'
Autor:
Kumar, Manoj, Ersfeld, Bernhard, Lee, Jaeho, Park, Dohyun, Kim, Seungyun, Nam, Inhyuk, Kim, Minseok, Jeon, Seongjin, Jaroszynski, Dino A., Suk, Hyyong, Hur, Min Sup
A novel method is presented for generating radiation using the beat wave associated with a bi-frequency laser pulse, to excite plasma oscillations in a plasma slab with a density gradient. By resonantly exciting a plasma wave, it can be localised and
Externí odkaz:
http://arxiv.org/abs/2402.17267
Autor:
Arohi Jain, Samuel R. Yoffe, Bernhard Ersfeld, George K. Holt, Devki Nandan Gupta, Dino A. Jaroszynski
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-11 (2024)
Abstract Electron self-injection in laser wakefield accelerators (LWFAs) is an important determinator of electron beam parameters. Controllable and adjustable LWFA beams are essential for applications. Controlled injection by capturing sheath electro
Externí odkaz:
https://doaj.org/article/fdfcab77070840b7a3a8e865833be48b
Autor:
Volmer, Frank, Ersfeld, Manfred, Junior, Paulo E. Faria, Waldecker, Lutz, Parashar, Bharti, Rathmann, Lars, Dubey, Sudipta, Cojocariu, Iulia, Feyer, Vitaliy, Watanabe, Kenji, Taniguchi, Takashi, Schneider, Claus M., Plucinski, Lukasz, Stampfer, Christoph, Fabian, Jaroslav, Beschoten, Bernd
Publikováno v:
npj 2D Mater. Appl. 7, 58 (2023)
We identify an optical excitation mechanism that transfers a valley polarization from photo-excited electron-hole pairs to free charge carriers in twisted WSe$_2$/MoSe$_2$ heterobilayers. For small twist angles, the valley lifetimes of the charge car
Externí odkaz:
http://arxiv.org/abs/2211.17210
Autor:
Hur, Min Sup, Ersfeld, Bernhard, Lee, Hyojeong, Lee, Hyunseok, Rho, Kyungmin, Lee, Yunkyu, Song, Hyung Seon, Yoffe, Samuel, Jaroszynski, Dino A., Suk, Hyyong
We propose a new method for laser pulse compression that uses the spatially varying dispersion of a plasma plume with a density gradient. This novel scheme can be used to compress ultrahigh power lasers. A long, negatively frequency-chirped, laser pu
Externí odkaz:
http://arxiv.org/abs/2208.08589
Autor:
Aniculaesei, Constantin, Ha, Thanh, Yoffe, Samuel, McCary, Edward, Spinks, Michael M, Quevedo, Hernan J., Labun, Lance, Labun, Ou Z., Sain, Ritwik, Hannasch, Andrea, Zgadzaj, Rafal, Pagano, Isabella, Franco-Altamirano, Jose A., Ringuette, Martin L., Gaul, Erhart, Luedtke, Scott V., Tiwari, Ganesh, Ersfeld, Bernhard, Brunetti, Enrico, Ruhl, Hartmut, Ditmire, Todd, Bruce, Sandra, Donovan, Michael E., Jaroszynski, Dino A., Downer, Michael C., Hegelich, Bjorn Manuel
Publikováno v:
Matter Radiat. Extremes 9, 014001 (2024)
In an electron wakefield accelerator, an intense laser pulse or charged particle beam excites plasma waves. Under proper conditions, electrons from the background plasma are trapped in the plasma wave and accelerated to ultra-relativistic velocities.
Externí odkaz:
http://arxiv.org/abs/2207.11492
Autor:
Frank Volmer, Manfred Ersfeld, Paulo E. Faria Junior, Lutz Waldecker, Bharti Parashar, Lars Rathmann, Sudipta Dubey, Iulia Cojocariu, Vitaliy Feyer, Kenji Watanabe, Takashi Taniguchi, Claus M. Schneider, Lukasz Plucinski, Christoph Stampfer, Jaroslav Fabian, Bernd Beschoten
Publikováno v:
npj 2D Materials and Applications, Vol 7, Iss 1, Pp 1-10 (2023)
Abstract Transition metal dichalcogenides (TMDs) have attracted much attention in the fields of valley- and spintronics due to their property of forming valley-polarized excitons when illuminated by circularly polarized light. In TMD-heterostructures
Externí odkaz:
https://doaj.org/article/70ebfad6a6244eab84738fd8b660efa0
Autor:
Constantin Aniculaesei, Thanh Ha, Samuel Yoffe, Lance Labun, Stephen Milton, Edward McCary, Michael M. Spinks, Hernan J. Quevedo, Ou Z. Labun, Ritwik Sain, Andrea Hannasch, Rafal Zgadzaj, Isabella Pagano, Jose A. Franco-Altamirano, Martin L. Ringuette, Erhart Gaul, Scott V. Luedtke, Ganesh Tiwari, Bernhard Ersfeld, Enrico Brunetti, Hartmut Ruhl, Todd Ditmire, Sandra Bruce, Michael E. Donovan, Michael C. Downer, Dino A. Jaroszynski, Bjorn Manuel Hegelich
Publikováno v:
Matter and Radiation at Extremes, Vol 9, Iss 1, Pp 014001-014001-10 (2024)
An intense laser pulse focused onto a plasma can excite nonlinear plasma waves. Under appropriate conditions, electrons from the background plasma are trapped in the plasma wave and accelerated to ultra-relativistic velocities. This scheme is called
Externí odkaz:
https://doaj.org/article/8d33b4259ad64cc1b9eecf5a76c93e3b
Autor:
Ersfeld, Manfred, Volmer, Frank, Rathmann, Lars, Kotewitz, Luca, Heithoff, Maximilian, Lohmann, Mark, Yang, Bowen, Watanabe, Kenji, Taniguchi, Takashi, Bartels, Ludwig, Shi, Jing, Stampfer, Christoph, Beschoten, Bernd
Publikováno v:
Spintronics XIII 11470, 114702M (2020)
One of the main tasks in the investigation of 2-dimensional transition metal dichalcogenides is the determination of valley lifetimes. In this work, we combine time-resolved Kerr rotation with electrical transport measurements to explore the gate-dep
Externí odkaz:
http://arxiv.org/abs/2007.14712
Autor:
Volmer, F., Ersfeld, M., Rathmann, L., Heithoff, M., Kotewitz, L., Watanabe, K., Taniguchi, T., Stampfer, C., Beschoten, B.
Publikováno v:
Phys. Status Solidi RRL, 2000298 (2020)
An in-depth analysis of valley physics in 2D materials like transition metal dichalcogenides requires the measurement of many material properties as a function of Fermi level position within the electronic band structure. This is normally done by cha
Externí odkaz:
http://arxiv.org/abs/2006.04775
Autor:
Ersfeld, Manfred, Volmer, Frank, Rathmann, Lars, Kotewitz, Luca, Heithoff, Maximilian, Lohmann, Mark, Yang, Bowen, Watanabe, Kenji, Taniguchi, Takashi, Bartels, Ludwig, Shi, Jing, Stampfer, Christoph, Beschoten, Bernd
We report on nanosecond long, gate-dependent valley lifetimes of free charge carriers in monolayer WSe$_2$, unambiguously identified by the combination of time-resolved Kerr rotation and electrical transport measurements. While the valley polarizatio
Externí odkaz:
http://arxiv.org/abs/1911.11692