103 citations · 303 across the 11 of their papers we have counts for
11 papers
Phonon Dispersion Effects and the Thermal Conductivity Reduction in GaAs/AlAs Superlattices
W. E. Bies, R. J. Radtke, H. Ehrenreich
The experimentally observed order-of-magnitude reduction in the thermal conductivity along the growth axis of (GaAs)_n/(AlAs)_n (or n x n) superlattices is investigated theoretical…
Thermoelectric Properties of Anisotropic Systems
W. E. Bies, R. J. Radtke, H. Ehrenreich
The effective transport coefficients and figure of merit ZT for anisotropic systems are derived from a macroscopic formalism. The full tensorial structure of the transport coeffici…
Mode Mixing in Antiferromagnetically Correlated Double Quantum Wells
R. J. Radtke, S. Das Sarma, A. H. MacDonald
We examine the robustness of a recently predicted exchange-induced zero-field magnetic phase in semiconductor double quantum wells in which each well is spin-polarized and the pola…
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…
Collective Modes in a Symmetry-Broken Phase: Antiferromagnetically Correlated Quantum Wells
R. J. Radtke, S. Das Sarma
We investigate the intersubband spin-density-excitation spectrum of a double quantum well in a low-density symmetry-broken phase with interwell antiferromagnetic correlations. This…
Theory of the c-Axis Penetration Depth in the Cuprates
R. J. Radtke, V. N. Kostur, K. Levin
Recent measurements of the London penetration depth tensor in the cuprates find a weak temperature dependence along the c-direction which is seemingly inconsistent with evidence fo…