Zobrazeno 1 - 10
of 421
pro vyhledávání: '"Bar-Joseph I"'
Resistively detected nuclear magnetic resonance is used to measure the Knight shift of the As nuclei and determine the electron spin polarization of the fractional quantum Hall states of the second Landau level. We show that the 5/2 state is fully po
Externí odkaz:
http://arxiv.org/abs/1201.3488
We apply polarization resolved photoluminescence spectroscopy to measure the spin polarization of a two dimensional electron gas in perpendicular magnetic field. In the vicinity of filling factor nu=5/2, we observe a sharp discontinuity in the energy
Externí odkaz:
http://arxiv.org/abs/1005.3112
Autor:
Plochocka, P., Schneider, J. M., Maude, D. K., Potemski, M., Rappaport, M., Umansky, V., Bar-Joseph, I., Groshaus, J. G., Gallais, Y., Pinczuk, A.
Publikováno v:
Phys. Rev. Lett. 102, 126806 (2009)
Optical absorption measurements are used to probe the spin polarization in the integer and fractional quantum Hall effect regimes. The system is fully spin polarized only at filling factor $\nu=1$ and at very low temperatures($\sim40$ mK). A small ch
Externí odkaz:
http://arxiv.org/abs/0901.3959
Autor:
Plochocka-Polack, P., Groshaus, J. G., Rappaport, M., Umansky, V., Gallais, Y., Pinczuk, A., Bar-Joseph, I.
Publikováno v:
PRL 98, 186810 (2007)
We study the absorption spectrum of a two-dimensional electron gas (2DEG) in a magnetic field. We find that that at low temperatures, when the 2DEG is spin polarized, the absorption spectra, which correspond to the creation of spin up or spin down el
Externí odkaz:
http://arxiv.org/abs/cond-mat/0701010
Autor:
Groshaus, J. G., Plochocka-Polack, P., Rappaport, M., Umansky, V., Bar-Joseph, I., Dennis, B. S., Pfeiffer, L. N, West, K. W., Gallais, Y., Pinczuk, A.
Publikováno v:
Phys. Rev. Lett. 98, 156803 (2007)
We present measurements of optical interband absorption in the fractional quantum Hall regime in a GaAs quantum well in the range 0 < nu < 1. We investigate the mechanism of singlet trion absorption, and show that its circular dichroism can be used a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609674
Autor:
Wildermuth, S., Hofferberth, S., Lesanovsky, I., Groth, S., Bar-Joseph, I., Krueger, P., Schmiedmayer, J.
Publikováno v:
Applied Physics Letters 88, 264103 (2006)
We discuss the application of Bose-Einstein condensates (BECs) as sensors for magnetic and electric fields. In an experimental demonstration we have brought one-dimensional BECs close to micro-fabricated wires on an atom chip and thereby reached a se
Externí odkaz:
http://arxiv.org/abs/cond-mat/0512520
Autor:
Schumm, T., Hofferberth, S., Andersson, L. M., Wildermuth, S., Groth, S., Bar-Joseph, I., Schmiedmayer, J., Kruger, P.
Publikováno v:
Nature Physics 1, 57 (2005)
Matter-wave interference experiments enable us to study matter at its most basic, quantum level and form the basis of high-precision sensors for applications such as inertial and gravitational field sensing. Success in both of these pursuits requires
Externí odkaz:
http://arxiv.org/abs/quant-ph/0507047
Autor:
Kruger, P., Andersson, L. M., Wildermuth, S., Hofferberth, S., Haller, E., Aigner, S., Groth, S., Bar-Joseph, I., Schmiedmayer, J.
Publikováno v:
Phys. Rev. A 76, 063621 (2007)
We show that previously observed large disorder potentials in magnetic microtraps for neutral atoms are reduced by about two orders of magnitude when using atom chips with lithographically fabricated high quality gold layers. Using one dimensional Bo
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504686
Publikováno v:
Phys. Rev. Lett. 93, 096802 (2004)
We measure the absorption spectrum of a two-dimensional electron system (2DES) in a GaAs quantum well in the presence of a perpendicular magnetic field. We focus on the absorption spectrum into the lowest Landau Level around nu=1. We find that the sp
Externí odkaz:
http://arxiv.org/abs/cond-mat/0406756
Autor:
Groth, S., Krüger, P., Wildermuth, S., Folman, R., Fernholz, T., Mahalu, D., Bar-Joseph, I., Schmiedmayer, J.
Publikováno v:
Applied Physics Letters, Vol. 85, No. 14, pp. 2980--2982, 2004
Neutral atoms can be trapped and manipulated with surface mounted microscopic current carrying and charged structures. We present a lithographic fabrication process for such atom chips based on evaporated metal films. The size limit of this process i
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404141