Zobrazeno 1 - 10
of 829
pro vyhledávání: '"Hoefer, U."'
Autor:
Ito, S., Schüler, M., Meierhofer, M., Schlauderer, S., Freudenstein, J., Reimann, J., Afanasiev, D., Kokh, K. A., Tereshchenko, O. E., Güdde, J., Sentef, M. A., Höfer, U., Huber, R.
Publikováno v:
Nature 616, 696-701 (2023)
Strong light fields have created spectacular opportunities to tailor novel functionalities of solids. Floquet-Bloch states can form under periodic driving of electrons and enable exotic quantum phases. On subcycle time scales, lightwaves can simultan
Externí odkaz:
http://arxiv.org/abs/2311.13309
Autor:
Reimann, J., Sumida, K., Kakoki, M., Kokh, K. A., Tereshchenko, O. E., Kimura, A., Güdde, J., Höfer, U.
Publikováno v:
Scientific Reports 13, 5796 (2023)
We study ultrafast population dynamics in the topological surface state of Sb$_2$Te$_3$ in two-dimensional momentum space with time- and angle-resolved two-photon photoemission. Linear polarized mid-infrared pump pulses are used to permit a direct op
Externí odkaz:
http://arxiv.org/abs/2212.10153
Autor:
Zimmermann, J. E., Axt, M., Mooshammer, F., Nagler, P., Schüller, C., Korn, T., Höfer, U., Mette, G.
Two-dimensional transition metal dichalcogenides (TMD) offer a unique platform for creating van-der-Waals heterojunctions with fascinating physical properties and promising applications in optoelectronics and valleytronics. Because of their typical t
Externí odkaz:
http://arxiv.org/abs/2105.05812
Atomic-scale chemical modification of surface-adsorbed ethyl groups on Si(001) was induced and studied by means of scanning tunneling microscopy. Tunneling at sample bias > +1.5V leads to tip-induced C-H cleavage of a $\beta$-hydrogen of the covalent
Externí odkaz:
http://arxiv.org/abs/2103.16641
Autor:
Kolata, K., Marquardt, S., Rosemann, N. W., Mager, A., Hansmann, A., Höfer, U., Berger, R., Breuer, T., Witte, G., Chatterjee, S.
Carrier multiplication by singlet exciton fission enhances photovoltaic conversion efficiencies in organic solids. This decay of one singlet exciton into two triplet states promises to overcome the Shockley-Queisser limit as up to two electrons may b
Externí odkaz:
http://arxiv.org/abs/1612.05177
Autor:
Kuroda, Kenta, Reimann, J., Kokh, K. A., Tereshchenko, O. E., Kimura, A., Güdde, J., Höfer, U.
Publikováno v:
Phys. Rev. B 95, 081103 (2017)
We present energy-momentum mapping of surface Dirac photocurrent in the topological insulator Sb$_2$Te$_3$ by means of time- and angle-resolved two-photon photoemission spectroscopy combined with polarization-variable mid-infrared pulse laser. It is
Externí odkaz:
http://arxiv.org/abs/1611.04247
Publikováno v:
J. Phys.: Condens. Matter 30 (2018) 484001
Optical second-harmonic generation is demonstrated to be a sensitive probe of the buried interface between the lattice matched semiconductors gallium phosphide and silicon with (001) orientation. Rotational anisotropy measurements of SHG from GaP/Si
Externí odkaz:
http://arxiv.org/abs/1611.01307
Publikováno v:
Sci. Rep. 7 (2017) 46561
We present an analytical one-dimensional model potential for the description of electronic interface states that form at the interface between a metal surface and flat-lying adlayers of $\pi$-conjugated organic molecules. The model utilizes graphene
Externí odkaz:
http://arxiv.org/abs/1610.08228
Publikováno v:
J. Phys.: Condens. Matter 32, 485901 (2020)
Two-dimensional transition metal dichalcogenides (TMDC) have shown promise for various applications in optoelectronics and so-called valleytronics. Their operation and performance strongly depend on the stacking of individual layers. Here, optical se
Externí odkaz:
http://arxiv.org/abs/1608.03434
Autor:
Jakob, P., Zaitsev, N. L., Namgalies, A., Tonner, R., Nechaev, I. A., Tautz, F. S., Höfer, U., Sanchez-Portal, D.
Publikováno v:
Phys. Rev. B 94, 125436 (2016)
The theoretical modelling of metal-organic interfaces represents a formidable challenge, especially in consideration of the delicate balance of various interaction mechanisms and the large size of involved molecular species. In the present study, the
Externí odkaz:
http://arxiv.org/abs/1608.01184