The main problem in theoretical analysis of structures with strong confinement is the fact that standard mathematical tools: differential equations and Fourier's transformations are no longer applicable. In this paper we have demonstrated that method of Green's functions can be successfully used on low-dimension crystal samples, as a consequence of quantum size effects. We can illustrate modified model through the prime cubic structure molecular crystal: bulk and ultrathin film. Our analysis starts with standard exciton Hamiltonian with definition of commutative Green's function and equation of motion. We have presented detailed procedure of calculations of Green's functions, and further dispersion law, distribution of states and relative permittivity for bulk samples. After this, we have followed the same procedures for obtaining the properties of excitons in ultra-thin films. The results have been presented graphically. Besides modified method of Green's functions we have shown that the exciton energy spectrum is discrete in film structures (with number of energy levels equal to the number of atomic planes of the film). Compared to the bulk structures, with continual absorption zone, in film structures exist resonant absorption peaks. With increased film thickness differences between bulk and film vanish.
Intrinsically ultralow thermal conductivity in all-inorganic superatomic bulk crystals
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所北京凝聚态物理国家实验室）；School of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences（中国科学院大学材料科学与光电技术学院）；Department of Energy and Resources Engineering, Peking University（北京大学能源与资源工程系）；Center for High Pressure Science and Technology Advanced Research（高压科学和技术先进研究中心）；Key Laboratory of Quantum Materials under Extreme Conditions in Shandong Province, School of Physics and Physical Engineering, Qufu Normal University（曲阜师范大学物理与物理工程学院山东省极端条件量子材料重点实验室）
研究通过生长Re6Se8Te7和Re6Te15超原子单晶，发现其在室温下热导率分别为0.32和0.53 W m-1 K-1，归因于高Grüneisen参数和低声速，验证了无序声子传输的存在。
Reactive pulsed direct current magnetron sputtering deposition of semiconducting yttrium oxide thin film in ultralow oxygen atmosphere: A spectroscopic and structural investigation of growth dynamics
Ultralow and Tunable Thermal Conductivity of Parylene C for Thermal Insulation in Advanced Packaging
School of Software & Microelectronics, Peking University（北京大学软件与微电子学院）；School of Integrated Circuits and Beijing Advanced Innovation Center for Integrated Circuits, Peking University（北京大学集成电路学院及北京集成电路先进创新中心）
From Amorphous to Amorphous-Crystalline Mixed-Phase Boron Nitride: Evolution of the Thermal and Elastic Properties
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST（加泰罗尼亚纳米科学与纳米技术研究所）；Faculty of Physics, Autonomous University of Barcelona（巴塞罗那自治大学物理系）；Universite Claude Bernard Lyon 1, CNRS, LMI, UMR 5615（里昂第一大学）；Faculty of Physics and Astronomy, Adam Mickiewicz University（亚当密茨凯维奇大学物理与天文学院）；International Iberian Nanotechnology Laboratory（伊比利亚纳米技术国际实验室）；ICREA（加泰罗尼亚高级研究院）
