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Photon's Structure of Motion

100%

Delić N., Tošić B., Šetrajčić J., Markoski B., Pelemiš S., Sajfert V., Zorić V.

Acta Physica Polonica A

2009

vol. 116

issue 4

471-475

A free photon Hamiltonian is linearized using Pauli's matrices. Based on the correspondence of Pauli's matrices kinematics and the kinematics of spin operators, it has been proved that a free photon integral of motion is a sum of orbital momentum and spin momentum for a half-one spin. Linearized Hamiltonian represents a bilinear form of products of spin and momentum operators. Unitary transformation of this form results in an equivalent Hamiltonian, which has been analyzed by the method of Green's functions. The evaluated Green function has given possibility for interpretation of photon reflection as a transformation of photon to antiphoton with energy change equal to double energy of photon and for spin change equal to Dirac's constant. Since photon is relativistic quantum object the exact determining of its characteristics is impossible. It is the reason for series of experimental works in which photon orbital momentum, which is not integral of motion, was investigated. The exposed theory was compared to the mentioned experiments and in some elements the satisfactory agreement was found.

Phonon Contribution in Thermodynamics οf Nano-Crystalline Films and Wires

84%

Šetrajčić J., Mirjanić D., Vučenović S., Ilić D., Markoski B., Jaćimovski S., Sajfert V., Zorić V.

Acta Physica Polonica A

2009

vol. 115

issue 4

778-782

Spectra of possible phonon states, as well as thermodynamic characteristics of nanocrystals (ultrathin film and quantum wire) of simple cubic crystalline structure are analyzed in this paper, using the method of two-time dependent Green functions. From energy spectra and internal energy of the system the thermal capacitance of these structures in low temperature region is found. The temperature behavior of specific heat is compared to that of corresponding bulk structure. It is shown that at extremely low temperatures thermal capacitance of quantum wire is considerably lower than the thermal capacitance of film as well as the bulk sample. Consequences of this fact are discussed in detail and its influence to thermodynamic properties of materials is estimated.

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2 Acta Physica Polonica A

2 2009

2 Markoski B.

2 Sajfert V.

2 Zorić V.

2 Šetrajčić J.

1 Delić N.

1 Ilić D.

1 Jaćimovski S.

1 Mirjanić D.

1 Pelemiš S.

1 Tošić B.

1 Vučenović S.

Search results

Photon's Structure of Motion

Phonon Contribution in Thermodynamics οf Nano-Crystalline Films and Wires