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In this article the 3D-optical trap using counter-propagating laser beams is proposed. The expressions described the space-distribution of laser total intensity, and related optical forces acting on the dielectric nano-particle are derived. Some simulated results are presented and discussed. Báo cáo Miệng 72. Operator Method for Exactly Solving Schrodinger Equation for Atoms Nguyen Phuong Duy Anh (1), Cao Ho Thanh Xuan (2), Nguyen Van Hoa (3), Le Van Hoang (3) (1) Thu Dau Mot University, 6 Tran Van On, Phu Hoa, Thu Dau Mot City, Binh Duong Province (2) Southern Agriculture College,Tan My Chanh, My tho City, Tien Giang Province (3) Ho Chi Minh City University of Pedagogy, 280 An Duong Vuong, Dist. 5, Ho Chi Minh City We show that the operator method (OM) using the Laplace transformation can be effectively applied to solve the Schrodinger equation for atoms. Detailed calculations performed on the hydrogen atom demonstrate convergence of perturbation series. Moreover, we can use the free parameter to regulate the rate of convergence. The basis set (the wave-function of a harmonic oscillator) in the form of annihilation and creation operators is very convenient to calculate the matrix elements using purely algebraic method applicable to other atoms. This result is the first step in an effort to apply non-perturbation method such as OM for atomic systems. Báo cáo Treo The Casimir force between Au and Si bodies is computed in different configurations by basing on Lifshitz theory with describing a dielectric for metal and semiconductor by means of plasma model and Drude model, respectively. The most precise experiments between a large Au sphere and Si plate demonstrate that in comparison with the experimental Casimir force, the theoretical calculation has from 0.5% to 7% error. The graphs offered in this paper opens predictions for measurement in the future. Báo cáo Treo 73. The Casimir Interaction between Au and Si in Arbitrary Configurations Phan Duc Anh, Chu Thuy Anh, Ngo Van Thanh, and Nguyen Ai Viet Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi Hội nghị Vật lý lý thuyết toàn quốc lần thứ 35 69 70 Tp. Hồ Chí Minh, 02-06/8/2010 74. Construction of Potential Energy Curve for the 3Pi State of NaLi Nguyen Tien Dung, Dinh Xuan Khoa, Vu Ngoc Sau, Nguyen Thanh Vinh, Tran Manh Cuong, and Nguyen Huy Bang Vinh University, 182 Le Duan Street, Vinh City, Vietnam. This paper presents construction of an accurate potential energy curve (PEC) for the 3Pi state of NaLi molecule by means of the Inverted Perturbation Approach (IPA). The previous PEC which was determined numerically in the framework of semi-classical Rydberg-Klein-Rees (RKR) method reported in the previous work [5] is used as a trial function in the IPA procedure to search an optimum potential energy. The optimum PEC (refered as IPA PEC) reproduces 380 observed spectral lines of the 3Pi←1Sigma band of NaLi with a dimesionless standard deviation 0.67. It is determined numerically in a grid of 0.1Çº in the region ranging from 2.5 to 5.0 Çº of internuclear distance, which coveres the overal experimental data. The obtained PEC can used to compare with recent ab initio calculations in [6,7]. References [1] W. Kosman, J. Hinze, J. Mol. Spectrosc. 56 (1975) 93. [2] C. Vidal, H. Scheingraber, J. Mol. Spectrosc. 65 (1977) 46. [3] A. Pashov et al., Comput. Phys. Commun 128 (2000) 622-634. [4] G. Herzberg, Molecular Spectra and Molecular Structure I. Spectra of Diatomic Molecules (Van Nostrand, Princeton, 1955). [5] Nguyen Huy Bang et al., Chem. Phys. Lett, 440 (2007) 199-202 [6] I. D. Petsalakis et al., J. Chem. Phys., 129, 054306 (2008) [7] N. Mabrouk et al., J. Phys. B: At. Mol. Opt.Phys. 41 (2008) 155101 (15pp) . Báo cáo Treo 75. Possibility of Entanglement Transferal in Uniform Electric Field Hui-Min Lin and Chia-Chu Chen National Cheng-Kung University, Physics Department, 1 University Road, Tainan, Taiwan By using the Rashba Hamiltonian, the evolution of spin entanglement of two spin-1/2 particles in a homogeneous electric field is investigated. It is shown that Bell states become disentangle within finite time and there exist un-entangled spin states which stay un-entangled during evolution. The correlations among spin-spin, momentum-momentum and spin-momentum entanglements are discussed in detail. Moreover, a state is constructed to illustrate the fact that spin-momentum entanglement is solely a dynamical effect which can arise without any entanglement of the other degree of freedom. The results are also extended to the mixed states where Werner states are treated. Báo cáo Treo 76. Chuyển động tương đối và chuyển động Chaos Phan Hoang Chuong Trường Đại Học Công Nghệ Thông Tin, Đại Học Quốc Gia Tp. Hồ Chí Minh, Kp6 Phường Linh Trung, Thủ Đức, Hồ Chí Minh Như trong chuyển động Brown các hạt chuyển động ziczac phức tạp mà sau là hình ảnh đặc trưng của chuyển động nhiệt phân tử. Trong chuyển động nhiệt, ngoài chuyển độ ziczac hỗn loạn còn có các dao động như vậy trong chuyển động Brown cũng có dao động. Ngoài những dao động nhiệt do năng lượng hấp thu từ photon nhiệt còn có những dao động biểu kiến do quan sát từ hệ ngoài. Theo quan điểm chuyển động tương đối, hệ ngoài xem như hệ thống đứng yên, hệ chuyển động gắn với hạt chuyển động với vận tốc ngẫu nhiên. Từ phép biến đổi Lorentz ta có thể nhận được biểu thức của dao động biểu kiến nếu dựa vào các đặc tính của chuyển động Chaos. Báo cáo Treo Hội nghị Vật lý lý thuyết toàn quốc lần thứ 35 71 77. Phương trình Schrodinger và phương trình truyền nhiệt Chaos Phan Hoang Chuong 72 Tp. Hồ Chí Minh, 02-06/8/2010
Trường Đại Học Công Nghệ Thông Tin, Đại Học Quốc Gia Tp. Hồ Chí Minh, Kp6 Phường Linh Trung, Thủ Đức, Hồ Chí Minh Phương trình Schrodinger là phương trình mô tả chuyển động của các hạt vi mô dưới dạng các hàm sóng, mặc dù không có dạng của phương trình sóng thông thường trong vật lý toán (không chứa đạo hàm cấp hai của thời gian). Mặt khác các hạt vi mô còn có tính hạt, tức là chuyển động thành dòng hạt. Từ đặc tính của chuyển động chaos ta có thể đưa phương trình Schrodinger về dạng phương trình truyền nhiệt thông thường với các biến Wiener. Từ đây có thể thấy các hạt chuyển động tựa dòng nhiệt và ta có thể thu được nghiệm phương trình mô tả hạt với thế đóng vai trò nguồn nhiệt. Báo cáo Treo 78. Influences of the Coupling Field on EIT Formation of the Threelevel Lambda Configuration of Rb 87 Nguyen Hoang Minh Tri (1), Vo Phuoc Huy (2), Dinh Xuan Khoa (3), Le Van Doai (3), Hoang Hong Khue (3), and Nguyen Huy Bang (3) (1) Faculty of Physics, Dong Thap University, 783 Pham Huu Lau Str., Dong Thap City, Vietnam; (2) Faculty of pedagogy, Bac Lieu University, 108 Vo Thi Sau Str., Bac Lieu Town, Vietnam; (3)Faculty of Physics, Vinh University, 182 Le Duan Str., Vinh city. In this work we investigate electromagnetically induced transparency (EIT) properties of cold Rb 87 atom formed by two laser beams, a strong coupling beam and a weak probe beam, via the three-level lambda excitation scheme. The response of the atom for the probe beam under the excitation of the coupling beam is represented by using density matrix formalism within the electric dipole and rotating wave approximations. In the regime of weak strength of the probe laser field, the matrix element which corresponds to the probe transition is derived analytically. We then consider influences frequency detuning and intensity of the coupling field on the absorption and dispersion coefficients on of the coupling laser field. References [1] S.E. Harris, J.E. Field, A. Imamoglu, Phys. Rev. Lett. 64 (1990) 1107. 73 Hội nghị Vật lý lý thuyết toàn quốc lần thứ 35 [2] K.J. Boller, A. Imamoglu, S.E. Harris, Phys. Rev. Lett. 66 (1991) 2593. [3] B.S.Ham, J. Mod. Opt. 49 (2002) 2477. [4] L.V. Hau, S. E. Harris, Z, Dutton, C.H. Bejroozi, Nature 397 (1999) 594. [5] M.D. Eisaman, A. Andre, F. Massou, M. Fleischhauer, A.S. Zibrov, M.D. Lukin, Nature 438 (2005) 837. [6] D.A. Braje, V. Balic, S. Goda, G.Y. Yin, S.E. Harris, Phys.Rev. Lett. 93 (2004) 183601. [7] H. Lee, M. Fleischhauer, M.O. Scully, Phys. Rev. A58 (1998) 2587. [8]. Yong-qing Li and Min Xiao, Phys. Rev. A51 (1995) R2703- 2706. [9] J. Gea-Banacloche, Yong-quing Li, Shao-zheng Jin, and Min Xiao, Phys. Rev A51 (1995) 576. [10] Cohen Tannoudji: Manipulating atoms with photons, Nobel lecture in Physics, 1997. Báo cáo Treo 79. Calculation of Vibrational Intensity Distribution for the 4Pi - 1Sigma Band of NaLi Dinh Xuan Khoa (1), Pham Quoc Linh (2), Nguyen Van Thinh (3), Nguyen Tien Dung (1), Le Canh Trung (1), and Nguyen Huy Bang (1) (1)Vinh University, 182 Le Duan Street, Vinh City, Vietnam; (2) Ca Mau ethnic boarding senior high school, Ca Mau City, Vietnam; (3) Bac Lieu University, 108 Vo Thi Sau Str., Bac Lieu Town, Vietnam. Within the Born-Oppenheimer approximation a molecular state is represented by the so-called radial Schrödinger dinger equation. By solving this equation one can obtain level energies together vibrational wave functions for the molecule. The calculated wave functions are then used perform the integration followed the Franck- Condon principle giving pattern of vibrational intensity distribution. In this paper we present our numerical calculation of vibrational intensity distribution for the 4Pi-1Sigma band of NaLi molecule by using Franck-Condon principle. We also determine internuclear distances at which spectral intensity is extreme. The calculated 74 Tp. Hồ Chí Minh, 02-06/8/2010 pattern of spectra is compared to recent experimental observations. We discuss deviations between the calculated and experimental results. Báo cáo Treo 80. On the Molecular Constants of Diatomic Molecules Nguyen Tien Dung (1), Nguyen Van Thinh (2), Le Canh Trung (1), Dinh Xuan Khoa (1), and Nguyen Huy Bang (1) (1) Faculty of Physics, Vinh University, 182 Le Duan Str., Vinh City, Vietnam; (2) Faculty of pedagogy, Bac Lieu University, 108 Vo Thi Sau Str., Bac Lieu Town, Vietnam. In this paper we present a brief theory of molecular constants and a procedure of linear least-squares method for determination of molecular constants for diatomic molecules. We propose three criteria for getting number of constants. The criteria are then used to determine molecular constants for 4Pi state of NaLi based on 420 spectral lines. We test consistency of the determined constants by using Kratzer relations. Having the molecular constants, we estimate dissociation energy of the 4Pi state and then compare to experimental one. We will discuss nature of deviation between our calculated and the experimental values of the dissociation energy. Báo cáo Treo 81. Local-Field Correction in the Strong Atom - Field Coupling Regime Tran Minh Hien and Ho Trung Dung Ho Chi Minh city Institute of Physics, 1 Mac Dinh Chi Str., District 1, Ho Chi Minh city The problem of local-field correction is typically studied in conjunction with the problem of spontaneous decay of an excited guest atom embedded in a bulk medium, with the atom-field interaction being in the weak-coupling regime. We consider an atom enclosed within a microsphere coated by dielectric layers with alternating high and low refractive index. The Bragg's reflections ensure that the strong atom-field coupling can occur. By taking Hội nghị Vật lý lý thuyết toàn quốc lần thứ 35 75 advantage of the real-cavity model and the fact that the Green tensor of concentric spheres is known in closed form, we study the effects of the local-field correction on the system dynamics, including the vacuum Rabi frequency. Báo cáo Treo 82. Generalization of Dirac and Yang monopoles for 9 -Dimensional Space Le Van Hoang and Nguyen Thanh Son Department of Theoretical Physics, Ho Chi Minh City University of Pedagogy, 280 An Duong Vuong, Dist. 5, Ho Chi Minh City Using the generalized Hurwitz transformation we found an equivalence between a 16-dimensional harmonic oscillator and a 9- dimensional hydrogen-like atom in the SO(8) gauge field. Based on this finding, we propose a method for establishing a monopole in a 9-dimensional space which is indeed a generalization of Dirac monopole (1931) for 3-dimensional space as well as of Yang monopole (1978) for 5-dimensional space. Báo cáo Treo 83. Entanglement Dynamics of Three-qubit Chain with Decoherence Nguyen Van Hop Faculty of Physics, Hanoi University of Education, 136 Xuan Thuy, Cau Giay, Ha Noi Abstract. We study quantum dynamics of three-qubit chain with decoherence, this work is devoted to a general theoretical study of this system with the decoherence caused by its interactions with the environment. The whole system of rate equations is separated into different subsystems. All approximative solutions of the system is derived and their explicit expressions are presented. The obtained results apply to studying entanglement of three-qubit system initially prepared in GHZ and W states and transmitted through the phase flip channels, amplitude damping as well as the dephase and amplitude damping. With the help of the lower bound for threequbit concurrence we show that W state preserves more entanglement than GHZ state in transmission through the phase flip 76 Tp. Hồ Chí Minh, 02-06/8/2010
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Page 3 and 4: [P-11] Tran Nguyen Dung, Conductanc
Page 5 and 6: [P-49] Nguyen Nhu Dat, Frequency‐
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Page 9 and 10: 13. BRST - Invariant String Functio
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Page 13 and 14: correlation length. The roughness-l
Page 15 and 16: due to SR counterpart. The differen
Page 17: oxidation state and by interpolatin
Page 21 and 22: In this article, we propose a two-p
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Page 25 and 26: 4096 and 8192 atoms. The calculatio
Page 27 and 28: 141 Lưu Thị Kim Thanh luuthikim.
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