arXiv subjects

A. Urayama

Publications and source records attributed to A. Urayama.

2 recordsLinked to original sources

arXiv1998

Interlayer Coherence in the $ν=1$ and $ν=2$ Bilayer Quantum Hall States

We have measured the Hall-plateau width and the activation energy of the bilayer quantum Hall (BLQH) states at the Landau-level filling factor $ν=1$ and 2 by tilting the sample and simultaneously changing the electron density in each quantum well. The phase transition between the commensurate and incommensurate states are confirmed at $ν=1$ and discovered at $ν=2$. In particular, three different $ν=2$ BLQH states are identified; the compound state, the coherent commensurate state, and the coherent incommensurate state.

cond-mat.mes-hall↗

arXiv1998

Phase Transition in ν=2 Bilayer Quantum Hall State

The Hall-plateau width and the activation energy were measured in the bilayer quantum Hall state at filling factor ν=2, 1 and 2/3, by changing the total electron density and the density ratio in the two quantum wells. Their behavior are remarkably different from one to another. The ν=1 state is found stable over all measured range of the density difference, while the ν=2/3$ state is stable only around the balanced point. The ν=2 state, on the other hand, shows a phase transition between these two types of the states as the electron density is changed.

cond-mat.mes-hall↗