Quantum, superfluid, helium dynamics

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• SERPİL YALÇIN KUZU

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• NEVİN AYTEMİZ

The accuracy of equation-of-state formulations is compared for theoretical total energies or experimental pressure-volume measurements for H 2 , Ne, Pt, and Ta. This spans the entire range of compression found for minerals and volatiles in the Earth. The Vinet equation is found to be most accurate. The origin of the b…

The relaxation of the higher-energy cis conformer of formic acid to the lower-energy trans form by a tunneling mechanism has been investigated in low-temperature rare gas matrices. In the temperature range 8–60 K, the tunneling takes place dominantly from the vibrational ground state of the cis form and the temperatur…

• RUI FAUSTO MARTINS RIBEIRO DA SILVA LOURENÇO

We have extended a weak-coupling theory of antiferromagnetic fluctuations to the superconducting state and analyzed NMR data for ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$. Within this framework we find that while an s-wave gap structure with 2\ensuremath{\Delta}(0)/${\mathit{kT}}_{\mathit{c}}$=4 can fi…

• NEJAT BULUT

We investigate the validity conditions of the single-mode approximation (SMA) in a spinor-1 atomic condensate when effects due to residual magnetic fields are negligible. For atomic interactions of the ferromagnetic type, the SMA is shown to be exact, with a mode function different from what is commonly used. However,…

• ÖZGÜR ESAT MÜSTECAPLIOĞLU

We analyze the phase diagram of uniform superfluidity for two-species fermion mixtures from the Bardeen-Cooper-Schrieffer to Bose-Einstein condensation (BEC) limit as a function of the scattering parameter and population imbalance. We find at zero temperature that the phase diagram of population imbalance versus scatt…

• MENDERES IŞKIN

We analyze the phase diagram of uniform superfluidity for two-species fermion mixtures from the Bardeen-Cooper-Schrieffer to Bose-Einstein condensation (BEC) limit as a function of the scattering parameter and population imbalance. We find at zero temperature that the phase diagram of population imbalance versus scatt…

• MENDERES IŞKIN

The importance of the electronic spin fluctuations in the ${\mathrm{CuO}}_{2}$ planes in the theory of the transverse nuclear relaxation for ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ has been demonstrated by Pennington and Slichter. We present the predictions of a RPA-like theory for the transverse nuc…

• NEJAT BULUT

We investigate the effect of impurities on the electron fluid-solid transition with parameters appropriate for the system recently studied by Pudalov et al. The nature of the crystalline state at $T=0$ in the presence of impurities is studied with the relaxation technique. The solid-fluid transition is studied via per…

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• YÜKSEL KAPLAN

How do protons and neutrons bind to form nuclei? This is the central question of ab initio nuclear structure theory. While the answer may seem as simple as the fact that nuclear forces are attractive, the full story is more complex and interesting. In this work we present numerical evidence from ab initio lattice simu…

• SERDAR ELHATISARI