Issue |
EPL
Volume 95, Number 4, August 2011
|
|
---|---|---|
Article Number | 40003 | |
Number of page(s) | 6 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/95/40003 | |
Published online | 03 August 2011 |
Cooling a nanomechanical resonator by a triple quantum dot
1
Department of Physics and State Key Laboratory of Surface Physics, Fudan University - Shanghai 200433, China
2
Department of Applied Physics, Hong Kong Polytechnic University - Hung Hom, Hong Kong, China
Received:
13
May
2011
Accepted:
7
July
2011
We propose an approach for achieving ground-state cooling of a nanomechanical resonator (NAMR) capacitively coupled to a triple quantum dot (TQD). This TQD is an electronic analog of a three-level atom in Λ configuration which allows an electron to enter it via lower-energy states and to exit only from a higher-energy state. By tuning the degeneracy of the two lower-energy states in the TQD, an electron can be trapped in a dark state caused by destructive quantum interference between the two tunneling pathways to the higher-energy state. Therefore, ground-state cooling of an NAMR can be achieved when electrons absorb readily and repeatedly energy quanta from the NAMR for excitations.
PACS: 03.65.Ta – Foundations of quantum mechanics; measurement theory / 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 73.21.La – Quantum dots
© EPLA, 2011
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