UConn Physics Colloquium
Mesoscopic electromechanical systems  are nano-to-micron scale mechanical resonators coupled to electronic devices of comparable dimensions, such that the mechanical resonator behaves in a manifestly quantum manner. Dramatic progress towards realising such systems has been made with the demonstration of a GHz mechanical resonator , and demonstrated displacement detection close to the quantum limit based on the single electron transistor [3-5]. The latter system, comprising a single electron transistor and micron-scale mechanical resonator electrostatically-coupled to the transistor island, is predicted to exhibit surprisingly rich dynamical behavior . The unprecedented displacement sensitivity of the SET transducer may also enable the observation of quantum 'jumps' in the motion of nanomechanical resonators at milliKelvin temperatures, due to the strain-mediated coupling between the flexing motion and tunneling defects of the resonator . Such investigations are contributing towards a deeper understanding of the transition between quantum and classical dynamics.
 M. Blencowe, Phys. Rep. 395 (2004) 159.
 X. Huang, C. Zorman, M. Mehregany, M. Roukes, Nature 421 (2003) 496;
 M. Blencowe, M. Wybourne, Appl. Phys. Lett. 77 (2000) 3845;
 R. Knobel, A. Cleland, Nature 424 (2003), 291;
 M. LaHaye, O. Buu, B. Camarota, K. Schwab, Science 304 (2004) 74;
 A. Armour, M. Blencowe, Y. Zhang, Phys. Rev. B 69 (2004) 125313;
 Y. Tanaka, M. Blencowe (in preparation).
Friday, October 15, 2004
Gant Science Complex
(We will meet for refreshments prior to the talk at 3:30 p.m., in the Gant Science Complex, Physics Library, Room P-103.)