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Generation and dynamics of phononic cat states after optical excitation of a quantum dot

Title data

Reiter, Doris ; Wigger, Daniel ; Axt, Vollrath M. ; Kuhn, Tilmann:
Generation and dynamics of phononic cat states after optical excitation of a quantum dot.
In: Physical Review B. Vol. 84 (2011) Issue 19 . - Art.Nr. 195327, 10 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.84.195327

Abstract in another language

We study theoretically the fluctuation properties of optical phonons generated after optical excitation of a quantum dot. If the quantum dot exciton is optically manipulated by ultrafast laser pulses, the electronic system and the phonon system can become entangled, which strongly influences the fluctuation properties of the phonons. When reduced to the phonon system, such an entanglement corresponds to a mixed phonon state. We discuss excitations with one or two ultrafast laser pulses. For a single pulse excitation, in general, a statistical mixture of two coherent states is found. For more pulses, a statistical mixture of superpositions of coherent states builds up in the phonon system. With the help of the Wigner function, which provides an intuitive picture of the generated phonon states, we explain how these states are formed depending on the excitation conditions and illustrate their time evolution. From this the fluctuation properties of the corresponding states can be well interpreted and the conditions for obtaining phonon squeezing are identified.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dots; generating functions; exact results; ultrafast dynamics; phonon squeezing; optical excitation; phonon dynamics; phononic Schrödinger cat states; Wigner function; lattice fluctuations
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 30 Oct 2017 14:22
Last Modified: 02 Nov 2017 13:00
URI: https://eref.uni-bayreuth.de/id/eprint/40229