Zobrazeno 1 - 10
of 461
pro vyhledávání: '"Buhmann, H"'
We investigate the crystal properties of CdTe nanowires overgrown with HgTe. Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) confirm, that the growth results in a high ensemble uniformity and that the individua
Externí odkaz:
http://arxiv.org/abs/1812.01248
Autor:
Khouri, T., Pezzini, S., Bendias, M., Leubner, P., Zeitler, U., Hussey, N. E., Buhmann, H., Molenkamp, L. W., Titov, M., Wiedmann, S.
Publikováno v:
Phys. Rev. B 99, 075303 (2019)
In this study we have measured the magnetoresistance response of inverted HgTe quantum wells in the presence of a large parallel magnetic field up to 33 T is applied. We show that in quantum wells with inverted band structure a monotonically decreasi
Externí odkaz:
http://arxiv.org/abs/1808.02268
Publikováno v:
Journal of Applied Physics; 11/7/2023, Vol. 134 Issue 17, p1-10, 10p
Autor:
Budewitz, A., Bendias, K., Leubner, P., Khouri, T., Shamim, S., Wiedmann, S., Buhmann, H., Molenkamp, L. W.
Magnetotransport measurements are presented on paramagnetic (Hg,Mn)Te quantum wells (QWs) with an inverted band structure. Gate-voltage controlled density dependent measurements reveal an unusual behavior in the transition regime from n- to p-type co
Externí odkaz:
http://arxiv.org/abs/1706.05789
Autor:
Inhofer, A., Tchoumakov, S., Assaf, B. A., Fève, G., Berroir, J. M., Jouffrey, V., Carpentier, D., Goerbig, M., Plaçais, B., Bendias, K., Mahler, D. M., Bocquillon, E., Schlereth, R., Brüne, C., Buhmann, H., Molenkamp, L. W.
Publikováno v:
Phys. Rev. B 96, 195104 (2017)
It is well established that topological insulators sustain Dirac fermion surface states as a consequence of band inversion in the bulk. These states have a helical spin polarization and a linear dispersion with large Fermi velocity. In this article w
Externí odkaz:
http://arxiv.org/abs/1704.04045
Autor:
Kessel, M., Hajer, J., Karczewski, G., Schumacher, C., Brüne, C., Buhmann, H., Molenkamp, L. W.
Publikováno v:
Phys. Rev. Materials 1, 023401 (2017)
We present results on the growth of CdTe-HgTe core-shell nanowires, a realization of a quasi one-dimensional heterostructure of the topological insulator HgTe. The growth is a two step process consisting of the growth of single crystalline zinc blend
Externí odkaz:
http://arxiv.org/abs/1703.09106
Autor:
Calvo, M. R., de Juan, F., Ilan, R., Fox, E. J., Bestwick, A. J., Mühlbauer, M., Wang, J., Ames, C., Leubner, P., Brüne, C., Zhang, S. C., Buhmann, H., Molenkamp, L. W., Goldhaber-Gordon, D.
Publikováno v:
Phys. Rev. Lett. 119, 226401 (2017)
We study the electronic transport across an electrostatically-gated lateral junction in a HgTe quantum well, a canonical 2D topological insulator, with and without applied magnetic field. We control carrier density inside and outside a junction regio
Externí odkaz:
http://arxiv.org/abs/1702.08561
Autor:
Wiedmann, S., Jost, A., Fauque, B., van Dijk, J., Meijer, M. J., Khouri, T., Pezzini, S., Grauer, S., Schreyeck, S., Brune, C., Buhmann, H., Molenkamp, L. W., Hussey, N. E.
Publikováno v:
Phys. Rev. B 94, 081302(R) (2016)
We report on high-field angle-dependent magneto-transport measurements on epitaxial thin films of Bi2Se3, a three-dimensional topological insulator. At low temperature, we observe quantum oscillations that demonstrate the simultaneous presence of bul
Externí odkaz:
http://arxiv.org/abs/1608.03615
Autor:
Khouri, T., Bendias, M., Leubner, P., Brüne, C., Buhmann, H., Molenkamp, L. W., Zeitler, U., Hussey, N. E., Wiedmann, S.
Publikováno v:
Phys. Rev. B 93 (2016) 125308
We report on the observation of the quantum Hall effect at high temperatures in HgTe quantum wells with a finite band gap and a thickness below and above the critical thickness $d_\textnormal{c}$ that separates a conventional semiconductor from a two
Externí odkaz:
http://arxiv.org/abs/1605.03342
Autor:
Dziom, V., Shuvaev, A., Pimenov, A., Astakhov, G. V., Ames, C., Bendias, K., Böttcher, J., Tkachov, G., Hankiewicz, E. M., Brüne, C., Buhmann, H, Molenkamp, L. W.
Publikováno v:
Nat. Commun. 8, 15197 (2017)
The electrodynamics of topological insulators (TIs) is described by modified Maxwell's equations, which contain additional terms that couple an electric field to a magnetization and a magnetic field to a polarization of the medium, such that the coup
Externí odkaz:
http://arxiv.org/abs/1603.05482