Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Fromm, Felix"'
Autor:
Fromm, Felix Jonathan
Die vorliegende Arbeit behandelt die Charakterisierung von epitaktischem Graphen auf Siliziumkarbid (0001) mittels Raman-Spektroskopie. Nach der Einführung theoretischer sowie experimenteller Grundlagen werden das Wachstum von Graphen auf Siliziumka
Autor:
Ulstrup, Søren, Schüler, Malte, Bianchi, Marco, Fromm, Felix, Raidel, Christian, Seyller, Thomas, Wehling, Tim, Hofmann, Philip
Publikováno v:
Phys. Rev. B 94, 081403 (2016)
Graphene is an ideal platform to study many-body effects due to its semimetallic character and the possibility to dope it over a wide range. Here we study the width of graphene's occupied $\pi$-band as a function of doping using angle-resolved photoe
Externí odkaz:
http://arxiv.org/abs/1604.00496
Autor:
Ulstrup, Søren, Johannsen, Jens Christian, Crepaldi, Alberto, Cilento, Federico, Zacchigna, Michele, Cacho, Cephise, Chapman, Richard T., Springate, Emma, Fromm, Felix, Raidel, Christian, Seyller, Thomas, Parmigiani, Fulvio, Grioni, Marco, Hofmann, Philip
Publikováno v:
Journal of Physics: Condensed Matter, 27, 164206 (2015)
In order to exploit the intriguing optical properties of graphene it is essential to gain a better understanding of the light-matter interaction in the material on ultrashort timescales. Exciting the Dirac fermions with intense ultrafast laser pulses
Externí odkaz:
http://arxiv.org/abs/1601.00745
Autor:
Johannsen, Jens C., Ulstrup, Søren, Crepaldi, Alberto, Cilento, Federico, Zacchigna, Michele, Miwa, Jill A., Cacho, Cephise, Chapman, Richard T., Springate, Emma, Fromm, Felix, Raidel, Christian, Seyller, Thomas, King, Phil D. C., Parmigiani, Fulvio, Grioni, Marco, Hofmann, Philip
Publikováno v:
Nano Lett. 15, 326-331 (2015)
Time- and angle-resolved photoemission measurements on two doped graphene samples displaying different doping levels reveal remarkable differences in the ultrafast dynamics of the hot carriers in the Dirac cone. In the more strongly ($n$-)doped graph
Externí odkaz:
http://arxiv.org/abs/1601.00702
Autor:
Ulstrup, Søren, Johannsen, Jens Christian, Cilento, Federico, Crepaldi, Alberto, Miwa, Jill A., Zacchigna, Michele, Cacho, Cephise, Chapman, Richard T., Springate, Emma, Fromm, Felix, Raidel, Christian, Seyller, Thomas, King, Phil D. C., Parmigiani, Fulvio, Grioni, Marco, Hofmann, Philip
In pump-probe time and angle-resolved photoemission spectroscopy (TR-ARPES) experiments the presence of the pump pulse adds a new level of complexity to the photoemission process in comparison to conventional ARPES. This is evidenced by pump-induced
Externí odkaz:
http://arxiv.org/abs/1502.01933
Autor:
Ulstrup, Søren, Johannsen, Jens Christian, Cilento, Federico, Miwa, Jill A., Crepaldi, Alberto, Zacchigna, Michele, Cacho, Cephise, Chapman, Richard, Springate, Emma, Mammadov, Samir, Fromm, Felix, Raidel, Christian, Seyller, Thomas, Parmigiani, Fulvio, Grioni, Marco, King, Phil D. C., Hofmann, Philip
Publikováno v:
Physical Review Letters 112, 257401 (2014)
Bilayer graphene is a highly promising material for electronic and optoelectronic applications since it is supporting massive Dirac fermions with a tuneable band gap. However, no consistent picture of the gap's effect on the optical and transport beh
Externí odkaz:
http://arxiv.org/abs/1403.0122
Autor:
Johannsen, Jens Christian, Ulstrup, Søren, Cilento, Federico, Crepaldi, Alberto, Zacchigna, Michele, Cacho, Cephise, Turcu, I. C. Edmond, Springate, Emma, Fromm, Felix, Raidel, Christian, Seyller, Thomas, Parmigiani, Fulvio, Grioni, Marco, Hofmann, Philip
The ultrafast dynamics of excited carriers in graphene is closely linked to the Dirac spectrum and plays a central role for many electronic and optoelectronic applications. Harvesting energy from excited electron-hole pairs, for instance, is only pos
Externí odkaz:
http://arxiv.org/abs/1304.2615
Autor:
Ubrig, Nicolas, Crassee, Iris, Levallois, Julien, Nedoliuk, Ievgeniia O., Fromm, Felix, Kaiser, Michl, Seyller, Thomas, Kuzmenko, Alexey B.
Publikováno v:
Optics Express, Vol. 21, Issue 21, pp. 24736-24741 (2013)
We demonstrate that giant Faraday rotation in graphene in the terahertz range due to the cyclotron resonance is further increased by constructive Fabry-Perot interference in the supporting substrate. Simultaneously, an enhanced total transmission is
Externí odkaz:
http://arxiv.org/abs/1303.1634
Autor:
Barreto, Lucas, Perkins, Edward, Johannsen, Jens, Ulstrup, Søren, Fromm, Felix, Raidel, Christian, Seyller, Thomas, Hofmann, Philip
Publikováno v:
Applied Physics Letters,102, 033110 (2013)
The electronic transport properties of epitaxial monolayer graphene (MLG) and hydrogen-intercalated quasi free-standing bilayer graphene (QFBLG) on SiC(0001) are investigated by micro multi-point probes. Using a probe with 12 contacts, we perform fou
Externí odkaz:
http://arxiv.org/abs/1211.0446
Autor:
Johannsen, Jens Christian, Ulstrup, Søren, Bianchi, Marco, Hatch, Richard, Guan, Dandan, Mazzola, Federico, Hornekær, Liv, Fromm, Felix, Raidel, Christian, Seyller, Thomas, Hofmann, Philip
Publikováno v:
J. Phys. Condens. Matter 25, 094001 (2013)
Quasi free-standing monolayer graphene can be produced by intercalating species like oxygen or hydrogen between epitaxial graphene and the substrate crystal. If the graphene is indeed decoupled from the substrate, one would expect the observation of
Externí odkaz:
http://arxiv.org/abs/1210.1704