We argue that many major features in electronic transport in realistic quantum dots are not explainable by the usual semiclassical approach, due to the contributions of the quantum-mechanical tunneling of the electrons through the Kolmogorov-Arnol'd-Moser islands. We show that dynamical tunneling gives rise to a set of resonances characterized by two… (More)
—As scaling and performance needs of industry has continued, silicon-on-insulator technology appears to be a viable option. However, the small sizes of these structures require a quantum treatment for the transport. In this paper, we present results from a full three-dimensional (3-D) quantum simulation and describe the effects of quantum interference and… (More)
—Nanowires have become of great interest in recent years, and great promise has followed their development. In this paper, we review the role of ballistic transport, the ballistic-to-diffusive crossover, and the possible impact of nanowires in integrated circuits.
—Within the next decade, it is predicted that we will reach the limits of silicon scaling as it is currently defined. Of the new devices under investigation, one of the most promising is the tri-gate quantum-wire transistor. In this paper, we study the role quantum interference plays in the operation of this device both in the ballistic and quasi-ballistic… (More)
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Areas of Interest Nanofabrication using electron beam lithography, molecular electronics, microelectromechanical systems for integrated circuit packaging, and nanomagnetics.
A small forbidden gap matched to low-energy photons (meV) and a quasi-Dirac electron system are both definitive characteristics of bilayer graphene (GR) that has gained it considerable interest in realizing a broadly tunable sensor for application in the microwave region around gigahertz (GHz) and terahertz (THz) regimes. In this work, a systematic study is… (More)
The concentrations of wave functions about classical periodic orbits, or quantum scars, are a fundamental phenomenon in physics. An open question is whether scarring can occur in relativistic quantum systems. To address this question, we investigate confinements made of graphene whose classical dynamics are chaotic and find unequivocal evidence of… (More)
We study electronic transport in quantum-dot structures made of graphene. Focusing on the rectangular dot geometry and utilizing the non-equilibrium Green's function to calculate the transmission in the tight-binding framework, we find significant fluctuations in the transmission as a function of the electron energy. The fluctuations are correlated with the… (More)