Strong Quantum Coherence between Fermi Liquid Mahan Excitons

Quantum phase transitions and Fermi liquid theory

Fermi liquid near Pomeranchuk quantum criticality

We analyze the behavior of an itinerant two-dimensional Fermi system near a charge nematic n=2 Pomeranchuk instability in terms of the Landau Fermi-liquid FL theory. A key object of our study is the fully renormalized vertex function , related to the Landau interaction function. We derive for a model case of the long-range interaction in the nematic channel. Already within the random-phase appr...

Fermi Liquid near a Quantum Critical Point *

We investigate the approach to the quantum critical point of a Pomeranchuk instability from the symmetric, disordered side of the phase diagram. In the low-temperature limit, a Fermi liquid description of the metal is possible and becomes exact for T → 0. We discuss in detail which features of the approach to quantum criticality can be captured within Fermi liquid theory and which are outside o...

Ultrafast double-quantum-coherence spectroscopy of excitons with entangled photons.

We calculate the four-wave-mixing signal of excitons generated at k(4) = k(1) + k(2) - k(3) by two pulsed entangled photon pairs (k(1), k(2))and(k(3), k(4)), where all four modes are chronologically ordered. Entangled photons offer an unusual combination of bandwidths and temporal resolution not possible by classical beams. Contributions from different resonances can be selected by varying the ...

Fermi-liquid versus non-Fermi-liquid behavior in triple quantum dots.

We study the effect of electron hopping in triple quantum dots modeled by the three-impurity Anderson model. We determine the range of hopping parameters where the system exhibits the two-channel Kondo effect and has non-Fermi-liquid properties in a wide temperature interval. As this interval is entered from above, the conductance through the side dots increases to a half of the conductance qua...