Quantum Effects in the Conductivity of Strongly Correlated 2D Systems at milli-Kelvin Temperatures
Department of Physics and Astronomy
One of the outstanding problems of modern solid state physics is the behavior of strongly-interacting and disordered electron systems. The fascinating physics of strong correlations unveils when the Coulomb interaction energy exceeds the Fermi energy. The theoretical description of 2D systems has not reached a predictive “first principles” stage yet, very little is known about fundamentals of strong electron-electron interactions, and about quantum ground state(s) of disordered interacting 2D systems. It is anticipated that the phase diagram of strongly interacting two-dimensional (2D) systems is remarkably rich: a multitude of electronic phases might lie between the limiting cases of a conventional paramagnetic Fermi liquid (high densities), Wigner crystal (low densities, weak disorder), and paramagnetic strongly localized state (strong disorder). Our experimental effort focuses on the study of quantum effects in the conductivity of high-mobility Si-based Metal-Oxide-Semiconductor Field Effect Transistors (Si MOSFETs).
Selected Publications:
V. M. Pudalov, M. E. Gershenson, N. N. Klimov, and H. Kojima. Quenched disorder effects in electron transport in Si inversion layers in the dilute regime. JETP Lett. 82, 412-417 (2005).
V. M. Pudalov, M. Gershenson, and H. Kojima, On the electron-electron interactions in two dimensions, in Fundamental Problems of Mesoscopic Physics, eds. I. V. Lerner et al., pp. 309-327 (Kluwer Academic Publishers, Dordrecht, 2004).
V. M. Pudalov, M. E. Gershenson, H. Kojima, G. Brunthaler, A. Prinz, and G. Bauer, Interaction effects in conductivity of Si inversion layers at intermediate temperatures. Phys. Rev. Lett. 91, 126403 1-4 (2003).
V. M. Pudalov, M. E. Gershenson, H. Kojima, N. Butch, E. M. Dizhur, G. Brunthaler, A. Prinz, and G. Bauer. The low-density spin susceptibility and effective mass of mobile electrons in Si inversion layers. Phys. Rev. Lett. 88, 196404 (2002).
M. E. Gershenson, V. M. Pudalov, H. Kojima, N. Butch, E. M. Dizhur, G. Brunthaler, A. Prinz, and G. Bauer. Crossed magnetic field technique for studying spin and orbital properties of 2d electrons in the dilute regime. Physica E 12, 585 (2002).