15 papers
Canted antiferromagnetic and spin singlet quantum Hall states in double-layer systems
Lian Zheng, Subir Sachdev, S. Das Sarma
We present details of earlier studies (Zheng et al, Phys. Rev. Lett. 78, 310 (1997) and Das Sarma et al, ibid 79, 917 (1997)) and additional new results on double-layer quantum Hal…
Double-layer quantum Hall antiferromagnetism at filling fraction nu=2/(odd integer)
S. Das Sarma, Subir Sachdev, Lian Zheng
A low energy action for double-layer quantum Hall systems at filling fractions ( an odd integer) is introduced. Interlayer antiferromagnetic exchange induces a phase wi…
Exchange Instabilities in Semiconductor Double Quantum Well Systems
Lian Zheng, M. W. Ortalano, S. Das Sarma
We consider various exchange-driven electronic instabilities in semiconductor double-layer systems in the absence of any external magnetic field. We establish that there is no exch…
Inelastic lifetimes of confined two-component electron systems in semiconductor quantum wire and quantum well structures
Lian Zheng, S. Das Sarma
We calculate Coulomb scattering lifetimes of electrons in two-subband quantum wires and in double-layer quantum wells by obtaining the quasiparticle self-energy within the framewor…
Plasmon-pole approximation for semiconductor quantum wire electrons
S. Das Sarma, E. H. Hwang, Lian Zheng
We develop the plasmon-pole approximation for an interacting electron gas confined in a semiconductor quantum wire. We argue that the plasmon-pole approximation becomes a more accu…
Spin-Excitation-Instability-Induced Quantum Phase Transitions in Double-Layer Quantum Hall Systems
Lian Zheng, R. J. Radtke, S. Das Sarma
We study intersubband spin density collective modes in double-layer quantum Hall systems at within the time-dependent Hartree-Fock approximation. We find that these intersubb…