Zobrazeno 1 - 10
of 415
pro vyhledávání: '"Gruner, G."'
We review our recent measurements of the complex AC conductivity of thin InO_x films studied as a function of magnetic field through the nominal 2D superconductor-insulator transition. These measurements - the first of their type to probe nonzero fre
Externí odkaz:
http://arxiv.org/abs/0706.0144
Publikováno v:
Phys. Rev. B 75, 094506 (2007)
We report a comprehensive study of the complex AC conductivity of thin effectively 2D amorphous superconducting InO_x films at zero applied field. Below a temperature scale T_c0 where the superconducting order parameter amplitude becomes well defined
Externí odkaz:
http://arxiv.org/abs/cond-mat/0612092
Publikováno v:
Phys. Rev. B 75, 184530 (2007)
The complex ac conductivity of thin highly disordered InOx films was studied as a function of magnetic field through the nominal two-dimensional superconductor-insulator transition. We have resolved a significant finite-frequency superfluid stiffness
Externí odkaz:
http://arxiv.org/abs/cond-mat/0604107
We present a short review of various experiments that measure charge transfer and charge transport in DNA. Some general comments are made on the possible connection between 'chemistry-style' charge transfer experiments that probe fluorescence quenchi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309360
The handling and manipulation of carbon nanotubes continues to be a challenge to those interested in the application potential of these promising materials. To this end, we have developed a method to deposit pure nanotube films over large flat areas
Externí odkaz:
http://arxiv.org/abs/cond-mat/0307712
We report measurements of the real and imaginary parts of the AC conductivity in the quantum limit, \hbar \omega > k_B T of insulating nominally uncompensated n-type silicon. The observed frequency dependence shows evidence for a crossover from inter
Externí odkaz:
http://arxiv.org/abs/cond-mat/0304093
Results of DC and frequency dependent conductivity in the quantum limit, i.e. hw > kT, for a broad range of dopant concentrations in nominally uncompensated, crystalline phosphorous doped silicon and amorphous niobium-silicon alloys are reported. The
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303589
The electrodynamic response of DNA in the millimeter wave range is investigated. By performing measurements under a wide range of humidity conditions and comparing the response of single strand DNA and double strand DNA, we show that the appreciable
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303240
Optical measurements of the real and imaginary frequency dependent conductivity of uncompensated n-type silicon are reported. The experiments are done in the quantum limit, $ \hbar\omega > k_{B}T$, across a broad doping range on the insulating side o
Externí odkaz:
http://arxiv.org/abs/cond-mat/0210472
Publikováno v:
Phys. Rev. Lett. 88, 186404 (2002)
The optical conductivity of the heavy fermions UPd2Al3 and UPt3 has been measured in the frequency range from 10 GHz to 1.2 THz (0.04 meV to 5 meV) at temperatures 1 K < T < 300 K. In both compounds a well pronounced pseudogap of less than a meV deve
Externí odkaz:
http://arxiv.org/abs/cond-mat/0201167