Rossi Enrico, Núñez Alvaro S, MacDonald A H
Department of Physics, University of Texas at Austin, 78712, USA.
Phys Rev Lett. 2005 Dec 31;95(26):266804. doi: 10.1103/PhysRevLett.95.266804. Epub 2005 Dec 23.
Bilayer quantum Hall systems have a broken symmetry ground state at a filling factor which can be viewed either as an excitonic superfluid or as a pseudospin ferromagnet. We present a theory of interlayer transport in quantum Hall bilayers that highlights remarkable similarities and critical differences between transport in Josephson junction and ferromagnetic metal spin-transfer devices. Our theory is able to explain the size of the large but finite low-bias interlayer conductance and the voltage width of this collective transport anomaly.
双层量子霍尔系统在一个填充因子下具有破缺对称性的基态，该填充因子既可以被视为激子超流体，也可以被视为赝自旋铁磁体。我们提出了一种量子霍尔双层中的层间输运理论，该理论突出了约瑟夫森结和铁磁金属自旋转移器件中输运之间显著的相似性和关键差异。我们的理论能够解释大但有限的低偏置层间电导的大小以及这种集体输运异常的电压宽度。
