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Edge Structures for Nanoscale Graphene Islands on Co(0001) Surfaces
Prezzi, Deborah,Eom, Daejin,Rim, Kwang T.,Zhou, Hui,Lefenfeld, Michael,Xiao, Shengxiong,Nuckolls, Colin,Heinz, Tony F.,Flynn, George W.,Hybertsen, Mark S. American Chemical Society 2014 ACS NANO Vol.8 No.6
<P>Low-temperature scanning tunneling microscopy measurements and first-principles calculations are employed to characterize edge structures observed for graphene nanoislands grown on the Co(0001) surface. Images of these nanostructures reveal straight well-ordered edges with zigzag orientation, which are characterized by a distinct peak at low bias in tunneling spectra. Density functional theory based calculations are used to discriminate between candidate edge structures. Several zigzag-oriented edge structures have lower formation energy than armchair-oriented edges. Of these, the lowest formation energy configurations are a zigzag and a Klein edge structure, each with the final carbon atom over the hollow site in the Co(0001) surface. In the absence of hydrogen, the interaction with the Co(0001) substrate plays a key role in stabilizing these edge structures and determines their local conformation and electronic properties. The calculated electronic properties for the low-energy edge structures are consistent with the measured scanning tunneling images.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-6/nn500583a/production/images/medium/nn-2014-00583a_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn500583a'>ACS Electronic Supporting Info</A></P>
C.I.Um,J.R.Choi,K.H.Yeon,T.F.George 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.6
Using the dynamical invariant operator method, we obtain the exact wave function, uncertainty relation, and energy eigenvalues for the harmonic oscillator with the classical equation of motion in the form of Mathieu functions. The probability density varies as a function of position, but is almost constant in time. The uncertainty relations satisfy the minimum uncertainty, and the energy eigenvalues oscillate slowly or rapidly depending on the frequency. The quantum and classical energies oscillate in a similar fashion with respect to frequency and time.
Exact Quantum Theory of a Lengthening Pendulum
엄정인,J.R.Choi,K.H.Yeon,S.Zhang,T.F.George 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.5
The exact wave function, energy eigenvalues and uncertainty relations of a lengthening pendulum are evaluated explicitly through the use of a time-dependent dynamical invariant method. The energy eigenvalues decrease linearly as time goes by, and the minimum value of the uncertainty is larger than ~=2. PACS numbers: 03.65.
Magnetic and Electronic Properties of a Mn Delta-doping GaN Layer
H. C. Jeon,이승주,강태원,장기주,Yung Kee Yeo,T. F. George 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
The magnetization curve as a function of the magnetic field at 5 K showed that the magnetization of the Mn delta-doped (Ga_(0.995)Mn_(0.005))N thin films was significantly enhanced in comparison with that of the conventionally-doped (Ga_(0.995)Mn_(0.005))N thin films. The magnetization curve as a function of the temperature showed that the Curie temperature of the Mn delta-doped (Ga_(0.995)Mn_(0.005))N thin films was above room temperature. The theoretical electronic results showed that Ga vacancies near the Mn delta-doping layer were likely to cause p-type conductance, indicative of an enhancement of the magnetic properties in (Ga_(1−x)Mn_x)N thin films.