arXiv subjects

G. Bauer

Publications and source records attributed to G. Bauer.

78 records · Page 5Linked to original sources

arXiv1999

Mixing and CP-Violation Measurements of $B^0$ Mesons from the Tevatron Collider

$B^0$ mixing measurements from the Tevatron Run I data are reported. These include time-integrated measurements of the average mixing parameter $\barχ$, six time-dependent oscillation measurements of $Δm_d$, and a time-dependent limit on $Δm_s$. Such measurements provide constraints on CKM matrix elements. A sample of $B^0/\bar{B}{^0} \to J/ψK^0_S$ decays is used to directly measure the CP-violation parameter $\sin(2β)$. This value agrees well with indirect constraints on the CKM matrix.

hep-ex↗

arXiv1999

Weak Field Hall Resistance and Effective Carrier Density Through Metal-Insulator Transition in Si-MOS Structures

We studied the weak field Hall voltage in 2D electron layers in Si-MOS structures with different mobilities, through the metal-insulator transition. In the vicinity of the critical density on the metallic side of the transition, we have found weak deviations (about 6-20 %) of the Hall voltage from its classical value. The deviations do not correlate with the strong temperature dependence of the diagonal resistivity rho_{xx}(T). The smallest deviation in R_{xy} was found in the highest mobility sample exhibiting the largest variation in the diagonal resistivity ρ_{xx} with temperature (by a factor of 5).

cond-mat.str-el↗

arXiv1998

Maximum Metallic Conductivity in Si-MOS Structures

We found that the conductivity of the two-dimensional electron system in Si-MOS structures is limited to a maximum value, G_{max}, as either density increases or temperature decreases. This value G_{max} is weakly disorder dependent and ranging from 100 to 140 e^2/h for samples whose mobilities differ by a factor of 4.

cond-mat.str-el↗

arXiv1998

Logarithmic Temperature Dependence of the Conductivity and Lack of Universal One-Parameter Scaling in the Two-Dimensional Metal

We show that the two-dimensional metallic state in Si-MOS samples persists over a wide range of temperatures (16 mK to 8 K), sample peak mobilities (varying by a factor of 8), carrier densities (0.8 to $35\times 10^{11}$ cm$^{-2}$) and conductances from 0.3 to $120 e^2/h$. Our data reveal a failure of the universal one-parameter scaling. We have found a weak delocalizing logarithmic correction to the conductivity, which governs a weak increase in the conductivity of the 2D metal as $T$ approaches zero.

cond-mat.str-el↗

arXiv1997

Interaction effects at the magnetic-field induced metal-insulator transition in Si/SiGe superlattices

A metal-insulator transition was induced by in-plane magnetic fields up to 27 T in homogeneously Sb-doped Si/SiGe superlattice structures. The localisation is not observed for perpendicular magnetic fields. A comparison with magnetoconductivity investigations in the weakly localised regime shows that the delocalising effect originates from the interaction-induced spin-triplet term in the particle-hole diffusion channel. It is expected that this term, possibly together with the singlet particle-particle contribution, is of general importance in disordered n-type Si bulk and heterostructures.

cond-mat.mes-hall↗

arXiv1997

Instability of the Two-Dimensional Metallic Phase to Parallel Magnetic Field

We report on magnetotransport studies of the unusual two-dimensional metallic phase in high mobility Si-MOS structures. We have observed that the magnetic field applied in the 2D plane suppresses the metallic state, causing the resistivity to increase dramatically by more than 30 times. Over the total existence range of the metallic state, we have found three distinct types of the magnetoresistance, related to the corresponding quantum corrections to the conductivity. Our data suggest that the unusual metallic state is a consequence of both spin- and Coulomb-interaction effects.

cond-mat.str-el↗