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Dephasing effects on coherent exciton-polaritons and the breakdown of the strong coupling regime

Publications associées (32)

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Aspects expérimentaux en spectroscopie et imagerie RMN

The main aim of this work is to detect metabolites in the brain by means of nuclear magnetic resonance spectroscopy. We were mostly interested by glutathione (GSH) and more particularly by its cysteine part which forms a strongly coupled ABX spins system. ...

EPFL2004

In vivo 1H NMR spectroscopy of the human brain at 7 T

Rolf Gruetter

In vivo 1H NMR spectra from the human brain were measured at 7 T. Ultrashort echo-time STEAM was used to minimize J-modulation and signal attenuation caused by the shorter T2 of metabolites. Precise adjustment of higher-order shims, which was achieved with ...

2001

Assignment and measurement of deuterium quadrupolar couplings in liquid crystals by deuterium-carbon NMR correlation spectroscopy

David Lyndon Emsley

The performance of deuterium-carbon correlation (DECOR) spectroscopy for the assignment and measurement of deuterium quadrupolar couplings in fully deuterated liquid crystalline phases is analyzed. The experiment relies on a broadband polarization transfer ...

AMER CHEMICAL SOC1998

Strong coupling of exciton-polaritons in semiconductor microcavities

Vincenzo Savona

The most important features of the physics of microcavity-embedded quantum wells are reviewed, with particular attention to the optical properties of exciton polaritons. The strong coupling regime, in which a finite polariton mode splitting appears (also c ...

1998

DETERMINATION OF DNA CONFORMATIONAL FEATURES FROM SELECTIVE 2-DIMENSIONAL NMR EXPERIMENTS

David Lyndon Emsley

Selective two-dimensional NMR correlation experiments are demonstrated to be particularly well suited to the problem of obtaining quantitative three-bond coupling constants in samples of DNA. The techniques were demonstrated by obtaining high-resolution sp ...

AMER CHEMICAL SOC1993

Frequency-modulated "chirp" pulses for broadband inversion recovery in magnetic resonance

Geoffrey Bodenhausen, Martial Rey

A novel approach to inversion recovery in NMR is described which combines adiabatic inversion with the observation of a spin echo refocused by a chirp pulse. This echo method allows one to generate in-phase magnetization over a broad range of frequencies. ...

1990

Strong coupling effects in z-filtered two-dimensional NMR correlation spectra

Geoffrey Bodenhausen

In 2-dimensional correlation spectra of strongly coupled spin systems obtained with the z-filtered COSY technique, the amplitudes of cross and diagonal peaks obey simple rules. They are simply proportional to the product of the amplitudes of the correspond ...

1987

Selective removal of magnetization in coupled NMR spectra

Geoffrey Bodenhausen

Two methods, based on the phase modulation of spin-echo signals due to J-coupling, of selective simplification of coupled homonuclear spectra are described. Both pulse methods employ a 90 Deg-t-180 Deg-t spin-echo sequence to prep. suitable phases of the m ...

1981

Heteronuclear J spectroscopy

Geoffrey Bodenhausen

In a study of heteronuclear J NMR spectroscopy, the radio frequency phase of the initial 90 Deg pulse was shifted together with the phase of the refocusing pulse. In heteronuclear spectra, the phase cycling method shifts all resonances by DF1 = (4Dt-1)-1 c ...

1980

Multiple quantum spin-echo spectroscopy

Geoffrey Bodenhausen

The generation of nuclear magnetic double quantum echoes and their detection by 2-dimensional Fourier transform spectroscopy is reported for partially aligned 1-deuteron systems in a nematic liq. crystal. Phase-cycling techniques which suppress detection o ...

1980