cold excitonic matter in cu 2 o under two-photon excitation

1

excitonic matter in Cu 2 O under two-photon excitati J. B. Ketterson 1 and R. P. H. Chang 2 1 Department of Physics and Astronomy 2 Department of Materials Science and Engineering Northwestern University, DMR-0353831 Photo-excitation & exciton PL after filtering Exciton and polariton emissions in cuprous oxide k E LPB UPB Laser pulse k o k o 2k o Exciton: Bound state of electron- hole Polariton: Quantum Superposition of an exciton and a photon e - h + a B = 0.7 nm Photon energy (m eV) 2000 2020 2040 P L inte nsity (a rb . units) 0 20 40 60 80 100 120 140 polaritons Impurity-bound excitons Propagating polaritons under two-photon excitation via Phase-space compression* *R. Shimano et al., PRL 89, 233601 (2002) ( + ) + ( ) = 2

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e -. polaritons. E. h +. 2k o. UPB. a B = 0.7 nm. LPB. k o. Impurity-bound excitons. k o. k. Laser pulse. Cold excitonic matter in Cu 2 O under two-photon excitation J. B. Ketterson 1 and R. P. H. Chang 2 1 Department of Physics and Astronomy - PowerPoint PPT Presentation

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Page 1: Cold excitonic matter in Cu 2 O under two-photon excitation

Cold excitonic matter in Cu2O under two-photon excitationJ. B. Ketterson1 and R. P. H. Chang2

1Department of Physics and Astronomy2Department of Materials Science and Engineering

Northwestern University, DMR-0353831

Photo-excitation & exciton PL after filtering

Exciton and polariton emissions in cuprous oxide

k

E

LPBUPB

Laser pulse

ko

ko

2ko

Exciton: Bound state

of electron-hole

Polariton: Quantum Superposition of an exciton and a photon

e-

h+

aB = 0.7 nm

Photon energy (meV)2000 2020 2040

PL

in

ten

sity (

arb

. u

nits)

0

20

40

60

80

100

120

140polaritons

Impurity-boundexcitons

Propagating polaritons under two-photon

excitation viaPhase-space compression*

*R. Shimano et al., PRL 89, 233601 (2002)

( + ) + ( ) = 2

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