##### Dr. Sergiu Cojocaru

Nanophysics. Atomic and continual models of elementary excitations in nanoscale systems, analytic approaches to physical models on finite crystal lattices. Effects of confinement (size, surface, dimensionality) and external fields on electronic, magnetic and mechanical properties (equilibrium and transport) of thin layered structures, quantum wells, quantum wires, quantum dots, optomechanical resonators, NEMS, etc. Nanodetectors (electromagnetic radiation, heat, mass, etc.). Quantum effects at the nanoscale.

High-Tc superconductivity and emerging materials. Properties and mechanisms related to strong electron correlations, electron-phonon interaction, spin and orbital excitations, SDW, CDW; connections between anomalies found by different experimental probes (e.g., optics, EELS, ARPES, NMR etc.). Many-body methods for strongly correlated electron systems. Graphene and carbon nanotubes. Disordered systems (spin and orientational glasses).

- S. Cojocaru, D.V. Anghel,
*Low-temperature electron-phonon heat transfer in metal films*, Physical Review B 93 (11), 115405; - S. Cojocaru, A. Naddeo, R. Citro,
*Modification of the Bloch law in ferromagnetic nanostructures*, EPL (Europhysics Letters) 106 (1), 17001; - S. Cojocaru, R. Citro, M. Marinaro,
*Incoherent midinfrared charge excitation and the high-energy anomaly in the photoemission spectra of cuprates,*Physical Review B 75 (22), 220502; - S. Cojocaru, R. Citro, M. Marinaro,
*Bond-stretching phonon anomalies and charge fluctuations in copper oxide superconductors,*Physical Review B 75(1), 014516; - S. Cojocaru, A. Ceulemans,
*Exact solution for spin-orbiton excitations on a ferromagnetically ordered finite chain,*Physical Review B 67 (22), 224413;