Zobrazeno 1 - 10
of 179
pro vyhledávání: '"Pfannkuche, D."'
Mean-field theories have since long predicted edge magnetism in graphene nanoribbons, where the order parameter is given by the local magnetization. However, signatures of edge magnetism appears elusive in the experiments, suggesting another class of
Externí odkaz:
http://arxiv.org/abs/2111.00891
Autor:
Prada, M., Pfannkuche, D.
Publikováno v:
Phys. Rev. B 95, 045421 (2017)
We present a theoretical study of the anisotropy of the spin relaxation and decoherence in typical quantum wells with an arbitrary magnetic field. In such systems, the orientation of the magnetic field relative to the main crystallographic directions
Externí odkaz:
http://arxiv.org/abs/1605.03399
Non-equilibrium many-particle spin states in self-assembled quantum dot hydrogen, helium and lithium
Autor:
Marquardt, B., Geller, M., Baxevanis, B., Pfannkuche, D., Wieck, A. D., Reuter, D., Lorke, A.
We introduce an all-electrical measurement technique, which makes it possible to prepare and detect the ground and excited many-particle states in self-assembled InAs QDs at 4K. This way, the pure-electron spectra of QD-hydrogen, -helium and -lithium
Externí odkaz:
http://arxiv.org/abs/1007.0392
Autor:
Ernst, P. T., Götze, S., Krauser, J. S., Pyka, K., Lühmann, D. -S., Pfannkuche, D., Sengstock, K.
Publikováno v:
Nature Physics 6, 56 - 61 (2009)
Strongly correlated many-body systems show various exciting phenomena in condensed matter physics such as high-temperature superconductivity and colossal magnetoresistance. Recently, strongly correlated phases could also be studied in ultracold quant
Externí odkaz:
http://arxiv.org/abs/0908.4242
Publikováno v:
Phys. Rev. B 75, 045434 (2007)
We compare quantum Hall systems at filling factor 2 to those at filling factors 2/3 and 2/5, corresponding to the exact filling of two lowest electron or composite fermion (CF) Landau levels. The two fractional states are examples of CF liquids with
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609756
Autor:
Schleser, R., Ihn, T., Ruh, E., Ensslin, K., Tews, M., Pfannkuche, D., Driscoll, D. C., Gossard, A. C.
Publikováno v:
Phys. Rev. Lett. 94, 206805 (2005)
We present finite bias transport measurements on a few-electron quantum dot. In the Coulomb blockade regime, strong signatures of inelastic cotunneling occur which can directly be assigned to excited states observed in the non-blockaded regime. In ad
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503037
A two quantum-dot device is coupled in parallel for studying the competition between the pseudo-spin Kondo effect and strongly hybridized molecular states. Cryogenic measurements are performed in the regime of weak coupling of the two dots to lead st
Externí odkaz:
http://arxiv.org/abs/cond-mat/0311023
Autor:
Chudnovskiy, A. L., Pfannkuche, D.
Publikováno v:
Phys. Rev. B. 65, 165216 (2002)
Influence of disorder on the ferromagnetic phase transition in diluted (III,Mn)V semiconductors is investigated analytically. The regime of small disorder is addressed, and the enhancement of the critical temperature by disorder is found both in the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0108396
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