Mansour Shayegan, Princeton University

Professor Princeton, New Jersey shayegan@princeton.edu Office: (609) 258-4639

Expert In

Physics of semiconductors Quantum information Semiconductor electronic properties

Bio/Research

My research group focuses primarily on the physics of semiconductors, with an emphasis on their electronic properties. Our work involves the growth of Gallium Arsenide/Aluminum Gallium Arsenide (GaAs/AlGaAs) heterostructures by molecular beam epitaxy, and studies of ballistic and quantum transport in these structures. Of particular interest are the many-body phenomena observed in these low-dimensional structures at low temperatures and high magnetic fields. Our research includes the fabrication, via molecular-beam epitaxy followed by various lithography techniques, of very clean (low-disorder) quantum-confined carrier systems, as well as measurements of their electronic transport properties. The systems we are studying, namely novel, high-quality, quasi-two-dimensional electron and hole systems in selectively doped GaAs/AlGaAs heterojunction structures, are among the cleanest carrier systems available. In these structures, the mobile carriers are spatially separated from the dopant (impurity) atoms to minimize scattering. As a result, the mean-free-path of carriers at low temperatures reaches several microns, allowing us to study ballistic and phase-coherent transport. Such structures also provide a crucial and important test bed for new many-body physics, since the dominant interaction at low temperatures is the repulsion between the electrons themselves. In our work, we study ballistic and phase-coherent transport, as well as many-body phenomena in a variety of structures such as superlattices, density-modulated systems, wide parabolic quantum wells, quantum wires and dots, and single- and multilayer electron and hole systems.

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