Výsledky vyhledávání - "Kogan, Andrei"

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Dynamic response of a spin-1/2 Kondo singlet

Autor: Hemingway, Bryan, Herbert, Stephen, Melloch, Michael, Kogan, Andrei

We present a study of spin 1/2 Kondo singlets in single electron transistors under a microwave frequency bias excitation. We compare time-averaged conductance $G$ to predicted universal response with respect to microwave frequency, oscillation amplit

Externí odkaz: http://arxiv.org/abs/1304.0037

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A quantitative study of spin-flip co-tunneling transport in a quantum dot

Autor: Liu, Tai-Min, Ngo, Anh T., Hemingway, Bryan, Herbert, Steven, Melloch, Michael, Ulloa, Sergio E., Kogan, Andrei

Publikováno v: Physical Review B, 2012

We report detailed transport measurements in a quantum dot in a spin-flip co-tunneling regime, and a quantitative comparison of the data to microscopic theory. The quantum dot is fabricated by lateral gating of a GaAs/AlGaAs heterostructure, and the

Externí odkaz: http://arxiv.org/abs/1110.5924

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Magnetic-Field-Induced Crossover to a Nonuniversal Regime in a Kondo Dot

Autor: Liu, Tai-Min, Hemingway, Bryan, Herbert, Steven, Melloch, Michael, Kogan, Andrei

Publikováno v: Phys. Rev. Lett. 103, 026803 (2009)

We have measured the magnetic splitting, $\Delta_K$, of a Kondo peak in the differential conductance of a Single-Electron Transistor while tuning the Kondo temperature, $T_K$, along two different paths in the parameter space: varying the dot-lead cou

Externí odkaz: http://arxiv.org/abs/0910.3180

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Magnetic Splitting of the Zero Bias Peak in a Quantum Point Contact with a Variable Aspect Ratio

Autor: Liu, Tai-Min, Hemingway, Bryan, Kogan, Andrei, Herbert, Steven, Melloch, Michael

Publikováno v: Phys. Rev. B 84, 075320 (2011) [4 pages]

We report a zero-bias peak in the differential conductance of a Quantum Point Contact (QPC), which splits in an external magnetic field. The peak is observed over a range of device conductance values starting significantly below $2e^2/h$. The observe

Externí odkaz: http://arxiv.org/abs/0910.0570

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Onset of Convection in a Very Compressible Fluid : The Transient Toward Steady State

Autor: Meyer, Horst, Kogan, Andrei B.

We analyze the time profile $\Delta T(t)$ of the temperature difference, measured across a very compressible supercritical $^3$He fluid layer in its convective state. The experiments were done along the critical isochore in a Rayleigh-B\'{e}nard cell

Externí odkaz: http://arxiv.org/abs/cond-mat/0209495

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