Zobrazeno 1 - 10
of 221
pro vyhledávání: '"Molitor F"'
Autor:
Roulleau, P., Baer, S., Choi, T., Molitor, F., Güttinger, J., Müller, T., Dröscher, S., Ensslin, K., Ihn, T.
Publikováno v:
Nature Communications 2, 239 (2011)
The coupling between a two-level system and its environment leads to decoherence. Within the context of coherent manipulation of electronic or quasiparticle states in nanostructures, it is crucial to understand the sources of decoherence. Here, we st
Externí odkaz:
http://arxiv.org/abs/1104.3754
Publikováno v:
Appl. Phys. Lett. 96, 152104 (2010)
We report on measurements of the quantum capacitance in graphene as a function of charge carrier density. A resonant LC-circuit giving high sensitivity to small capacitance changes is employed. The density of states, which is directly proportional to
Externí odkaz:
http://arxiv.org/abs/1001.4690
Autor:
Molitor, F., Knowles, H., Dröscher, S., Gasser, U., Choi, T., Roulleau, P., Güttinger, J., Jacobsen, A., Stampfer, C., Ensslin, K., Ihn, T.
Publikováno v:
EPL 89, 67005 (2010)
We study a graphene double quantum dot in different coupling regimes. Despite the strong capacitive coupling between the dots, the tunnel coupling is below the experimental resolution. We observe additional structures inside the finite-bias triangles
Externí odkaz:
http://arxiv.org/abs/1001.4700
Publikováno v:
Appl. Phys. Lett. 94, 222107 (2009)
We present Coulomb blockade measurements in a graphene double dot system. The coupling of the dots to the leads and between the dots can be tuned by graphene in-plane gates. The coupling is a non-monotonic function of the gate voltage. Using a purely
Externí odkaz:
http://arxiv.org/abs/0905.0660
Publikováno v:
Phys. Rev. Lett. 102, 056403 (2009)
Transport measurements on an etched graphene nanoribbon are presented. It is shown that two distinct voltage scales can be experimentally extracted that characterize the parameter region of suppressed conductance at low charge density in the ribbon.
Externí odkaz:
http://arxiv.org/abs/0811.0694
Publikováno v:
Phys. Rev. B 79, 075426 (2009)
We present measurements on side gated graphene constrictions of different geometries. We characterize the transport gap by its width in back gate voltage and compare this to an analysis based on Coulomb blockade measurements of localized states. We s
Externí odkaz:
http://arxiv.org/abs/0811.0676
Publikováno v:
Applied Physics Letters 93, 212102 (2008)
We report measurements on a graphene quantum dot with an integrated graphene charge detector. The quantum dot device consists of a graphene island (diameter approx. 200 nm) connected to source and drain contacts via two narrow graphene constrictions.
Externí odkaz:
http://arxiv.org/abs/0809.3904
Publikováno v:
Appl. Phys. Lett. 94, 012107 (2009)
We demonstrate that excited states in single-layer graphene quantum dots can be detected via direct transport experiments. Coulomb diamond measurements show distinct features of sequential tunneling through an excited state. Moreover, the onset of in
Externí odkaz:
http://arxiv.org/abs/0807.2710
Publikováno v:
New Journal of Physics 10, 125029 (2008)
We present transport measurements on a tunable three-layer graphene single electron transistor (SET). The device consists of an etched three-layer graphene flake with two narrow constrictions separating the island from source and drain contacts. Thre
Externí odkaz:
http://arxiv.org/abs/0806.1384
Publikováno v:
Nano Lett. 8, 2378 (2008)
We report electronic transport experiments on a graphene single electron transistor. The device consists of a graphene island connected to source and drain electrodes via two narrow graphene constrictions. It is electrostatically tunable by three lat
Externí odkaz:
http://arxiv.org/abs/0806.1475