| フルテキストURL | fulltext.pdf |
|---|---|
| 著者 | Suichi, Takahiro| Ishikawa, Atsushi| Tanaka, Takuo| Hayashi, Yasuhiko| Tsuruta, Kenji| |
| 発行日 | 2020-04-16 |
| 出版物タイトル | Scientific Reports |
| 巻 | 10巻 |
| 号 | 1号 |
| 出版者 | Nature |
| 開始ページ | 6486 |
| ISSN | 2045-2322 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 著作権者 | © The Author(s) 2020 |
| 論文のバージョン | publisher |
| PubMed ID | 32300158 |
| DOI | 10.1038/s41598-020-63591-7 |
| Web of Science KeyUT | 000562142100005 |
| 関連URL | isVersionOf https://doi.org/10.1038/s41598-020-63591-7 |
| JaLCDOI | 10.18926/14058 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_42_44.pdf |
| 著者 | Ogawa Takafumi| 鶴田 健二| 東辻 千枝子| 東辻 浩夫| Hiroshi Iyetomi| |
| 抄録 | To analyze vibrational properties of Si crystal with a single charge-neutral vacancy, we perform large-scale simulations based on tight-binding molecular-dynamics method. Vibrational modes and frequencies are obtained by diagonalizing dynamical matrix within a harmonic approximation. Results indicate that there exist vibrational modes spatially localized around the vacancy and large frequency shifts associated with the localized modes contribute significantly to reduction of the vibrational free energy. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2008-01 |
| 巻 | 42巻 |
| 号 | 1号 |
| 開始ページ | 44 |
| 終了ページ | 47 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308412 |
| フルテキストURL | fulltext.pdf |
|---|---|
| 著者 | Hada, Masaki| Yamaguchi, Daisuke| Ishikawa, Tadahiko| Sawa, Takayoshi| Tsuruta, Kenji| Ishikawa, Ken| Koshihara, Shin-Ya| Hayashi, Yasuhiko| Kato, Takashi| |
| 発行日 | 2019-09-13 |
| 出版物タイトル | Nature Communications |
| 巻 | 10巻 |
| 出版者 | Nature Publishing Group |
| 開始ページ | 4159 |
| ISSN | 2041-1723 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 著作権者 | © The Author(s) 2019 |
| 論文のバージョン | publisher |
| PubMed ID | 31519876 |
| DOI | 10.1038/s41467-019-12116-6 |
| Web of Science KeyUT | 000485685200005 |
| 関連URL | isVersionOf https://doi.org/10.1038/s41467-019-12116-6 |
| 著者 | Totsuji, Hiroo| Liman, M. Sanusi| Totsuji, Chieko| Tsuruta, Kenji| |
|---|---|
| 発行日 | 2004-7 |
| 出版物タイトル | Physical Review E |
| 巻 | 70巻 |
| 号 | 1号 |
| 資料タイプ | 学術雑誌論文 |
| フルテキストURL | APL_117_101103.pdf |
|---|---|
| 著者 | Iida, Takumi | Ishikawa, Atsushi| Tanaka, Takuo| Muranaka, Atsuya| Uchiyama, Masanobu| Hayashi, Yasuhiko| Tsuruta, Kenji| |
| 備考 | This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Takumi Iida et. al. Super-chiral vibrational spectroscopy with metasurfaces for high-sensitive identification of alanine enantiomers. Appl. Phys. Lett. 117, 101103 (2020) and may be found at https://doi.org/10.1063/5.0012331.| |
| 発行日 | 2020-09-09 |
| 出版物タイトル | Applied Physics Letters |
| 巻 | 117巻 |
| 号 | 10号 |
| 出版者 | American Institute of Physics |
| 開始ページ | 101103 |
| ISSN | 0003-6951 |
| NCID | AA00543431 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 論文のバージョン | publisher |
| DOI | 10.1063/5.0012331 |
| Web of Science KeyUT | 000571581400002 |
| 関連URL | isVersionOf https://doi.org/10.1063/5.0012331 |
| 著者 | Totsuji, Hiroo| Ogawa, Takafumi| Totsuji, Chieko| Tsuruta, Kenji| |
|---|---|
| 発行日 | 2005-9 |
| 出版物タイトル | Physical Review E |
| 巻 | 72巻 |
| 号 | 3号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/46949 |
|---|---|
| フルテキストURL | mfe_38_1-2_029_032.pdf |
| 著者 | Totsuji, Hiroo| Totsuji, Chieko| Ogawa, Takafumi| Tsuruta, Kenji| |
| 抄録 | The structure of dust particles in dusty plasmas under microgravity has been analyzed by molecular dynamics simulation. The charge neutrality condition satisfied by the system composed of dust particles and ambient plasma is properly taken into account. It is shown that dust particles form shell structures at low temperatures and the number of shells are obtained as a phase diagram in the plane of two parameters characterizing the system: the number of particles and the strength of screening. It is also shown that these structures are almost independent of the strength of screening. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2004-03 |
| 巻 | 38巻 |
| 号 | 1-2号 |
| 開始ページ | 29 |
| 終了ページ | 32 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 80016863328 |
| JaLCDOI | 10.18926/46999 |
|---|---|
| フルテキストURL | mfe_36_1_041_049.pdf |
| 著者 | Totsuji, Hiroo| Kishimoto, Tokunari| Totsuji, Chieko| Tsuruta, Kenji| |
| 抄録 | The ground state of spherical clusters of charged particles of one species confined by the three-dimensional parabolic potential is investigated by molecular dynamics simulations with the system size from N = 5000 to N = 1.2 × 10(5) . The cohesive energy per particle is compared between the shell-structured clusters and spherical finite bcc lattices with relaxed surfaces, the former and the latter being the ground states for small systems and for the large enough systems, respectively. It is shown that, when N > N(c)(N(c) > N), finite bcc lattices with relaxed surfaces (the shell structures) have stronger cohesion than the shell structures (finite bcc lattices with relaxed surfaces) and the critical value of the transition N(c) is estimated to be 10(4) < N(c) < 1.4 × 10(4) . The nucleation of the bcc lattice in the shell-structured cluster of 2 × 10(4) ions is observed. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2001-12 |
| 巻 | 36巻 |
| 号 | 1号 |
| 開始ページ | 41 |
| 終了ページ | 49 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 80015112663 |
| JaLCDOI | 10.18926/14120 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_40_1_36.pdf |
| 著者 | 内田 厚| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |
| 抄録 | We present a Stochastic-Difference-Equation (SDE) approach to long time-scale molecular dynamics (MD) simulations, which are required for nanosecond-scale phenomena. In this method, the MD trajectory in a fixed time period is obtained as a stationary solution of an action functional based on an error accumulation of the equation of motion along the path, thus reducing the problem to a boundary-value problem, instead of an initial-value problem in the ordinary MD method. We apply the method to formation processes of Cu thin film via nanocluster deposition onto a substrate. The applicability of the SDE algorithm to the problem and the effects of the choice of SDE parameters on the optimization processes of configuration pathway are examined. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2006-01 |
| 巻 | 40巻 |
| 号 | 1号 |
| 開始ページ | 36 |
| 終了ページ | 39 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308517 |
| JaLCDOI | 10.18926/14061 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_42_56.pdf |
| 著者 | Miyake Takashi| 東辻 千枝子| Nakanishi Kenta| 鶴田 健二| 東辻 浩夫| |
| 抄録 | We analyze the ground state of the two-dimensional quantum system of electrons confined in a parabolic potential with the system size around 100. We map the system onto a classical system on the basis of the classical-map hypernetted-chain (CHNC) method which has been proven to work in the integral-equation-based analyses of uniform unbounded systems and then apply classical numerical simulations. We find that the confined system undergoes the transition to the spin polarized state with the decrease of the average density and the corresponding critical value is as low as rs ∼ 0.3 in terms of the usual rs parameter estimated for the average density. As the ground state for given value of the rs parameter, our data give the critical value for the transition around 20 which is consistent with the known possibility. The advantage of our method is a direct applicability to geometrically complex systems which are difficult to analyze by integral equations. The application to the structure like quantum dots reported here is the first example of such applications. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2008-01 |
| 巻 | 42巻 |
| 号 | 1号 |
| 開始ページ | 56 |
| 終了ページ | 59 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308633 |
| 著者 | Totsuji, Hiroo| Totsuji, Chieko| Ogawa, Takafumi| Tsuruta, Kenji| |
|---|---|
| 発行日 | 2005-4 |
| 出版物タイトル | Physical Review E |
| 巻 | 71巻 |
| 号 | 4号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/19674 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_33_2_71.pdf |
| 著者 | 鶴田 健二| 東辻 浩夫| 東辻 千枝子| |
| 抄録 | A parallel tight-binding molecular dynamics with an order-N [O(N))] algorithm is implemented to perform large-scale simulation of nanostructured materials. The algorithm is based on the Fermi-operator expansion of an electronic energy and force, and we present its basic formalisms. Accuracy necessary for molecular-dynamics simulations can be obtained by a proper truncation in the expansion. Parallel efficiency on a parallel PC cluster shows nearly ideal scaling behavior with respect to the number of processors. Applicability of the method to a silicon-carbide system is examined. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1999-04-27 |
| 巻 | 33巻 |
| 号 | 2号 |
| 開始ページ | 71 |
| 終了ページ | 77 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002309027 |
| JaLCDOI | 10.18926/14059 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_42_48.pdf |
| 著者 | 東辻 千枝子| Miyake Takashi| Nakanishi Kenta| 鶴田 健二| 東辻 浩夫| |
| 抄録 | Based on the mapping introduced by the classical-map hypernetted-chain (CHNC) method, classical numerical simulations, Monte Carlo and molecular dynamics, have been applied to the twodimensional electron fluid and the results are compared with those of quantum Monte Carlo simulations hitherto reported. It is shown that polarization properties of the ground state obtained by the diffusion Monte Carlo method are reproduced within the accuracy of quantum simulations by both of two mapping functions for the quantum temperature which have been proposed within the CHNC method. These results may serve as the basis of numerical simulations based on the CHNC method which are applicable to finite non-periodic systems like quantum dots and systems at finite temperatures. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2008-01 |
| 巻 | 42巻 |
| 号 | 1号 |
| 開始ページ | 48 |
| 終了ページ | 52 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308425 |
| JaLCDOI | 10.18926/19954 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_44_7.pdf |
| 著者 | Maetani Noriaki| Kurose Tomoyuki| 鶴田 健二| |
| 抄録 | The lens effect of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finite-difference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in water. Lens effect is observed by the negative refraction of acoustic waves, which results in refocusing of the waves at the point outside the crystal. To increase the focal intensity, we introduce a 2D phononic crystal shield with a different composition of material, which returns the incident waves back to the lens via the perfect reflection. Also, the dependence on filling fraction of metal in the crystal is studied. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2010-01 |
| 巻 | 44巻 |
| 開始ページ | 7 |
| 終了ページ | 12 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002309019 |
| JaLCDOI | 10.18926/15358 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_35_63.pdf |
| 著者 | Shinomiya Shigeru| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |
| 抄録 | We present a theoretical study of Si(1-x)Ge(x) alloys based on tight-binding molecular dynamics (TBMD) calculations. First, we introduce a new set of nonorthogonal tight-binding parameters for silicon and germanium based on the previous work by Menon and Subbaswamy [Phys. Rev. B 55, 9231 (1997); J. Phys: Condens. Matter 10, 10991 (1998)]. We then apply the method to structural analyses of Si(1-x)Ge(x) alloys. The equilibrium volume and atomic structure for a given x are obtained by the TBMD method. We also calculate the bulk modulus B, elastic constants C(11), C(12) and C(44) as a function of x. The results show that the moduli vary monotonically, but nonlinearly, between the values of Si crystal and Ge crystal. The validity of the results is also discussed. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2001-03-27 |
| 巻 | 35巻 |
| 号 | 1-2号 |
| 開始ページ | 63 |
| 終了ページ | 75 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307673 |
| JaLCDOI | 10.18926/19673 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_33_2_61.pdf |
| 著者 | 東辻 浩夫| 鶴田 健二| 東辻 千枝子| |
| 抄録 | The behavior of multicomponent plasmas in the Penning-Malmberg traps is discussed with the parameters corresponding to experiments with antiprotons and cryogenic electrons. The relaxation times for the energy transfer antiprotons to electrons and between parallel and perpendicular components of electrons are estimated. It is shown that, depending on the values of parameters, both the former and the latter can be the bottleneck in the cooling process. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1999-04-27 |
| 巻 | 33巻 |
| 号 | 2号 |
| 開始ページ | 61 |
| 終了ページ | 69 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002309106 |
| JaLCDOI | 10.18926/15361 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_35_77.pdf |
| 著者 | Kishimoto Tokunari| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |
| 抄録 | In order to perform the large-scale molecular dynamics simulation of the Yukawa system, a mathematical expression for molecular dynamics using the fast multipole method is described. The model simulations are also performed to test the performance of our implementation of the FMM. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2001-03-27 |
| 巻 | 35巻 |
| 号 | 1-2号 |
| 開始ページ | 77 |
| 終了ページ | 95 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307940 |
| JaLCDOI | 10.18926/14119 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_40_1_31.pdf |
| 著者 | 小川 貴史| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |
| 抄録 | We analyze the melting of spherical Yukawa clusters by Monte Carlo simulations. Spherical clusters are expected to be found in dusty plasmas in an isotropic environment such as microgravity and serve as a model for classical clusters. We obtain the specific heat through fluctuations of the potential energy and identify its peak as the transition temperature. Melting temperatures are compared with those of bulk Yukawa systems and it is confirmed that the melting temperature increases and approaches the bulk value with the increase of the system size. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2006-01 |
| 巻 | 40巻 |
| 号 | 1号 |
| 開始ページ | 31 |
| 終了ページ | 35 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308329 |
| フルテキストURL | fulltext.pdf |
|---|---|
| 著者 | Takasugi, Shota| Watanabe, Keita| Misawa, Masaaki| Tsuruta, Kenji| |
| 備考 | This fulltext is available in Feb. 2022.| |
| 発行日 | 2021-02-22 |
| 出版物タイトル | Japanese Journal of Applied Physics |
| 巻 | 60巻 |
| 号 | SD号 |
| 出版者 | IOP Publishing |
| 開始ページ | SDDA01 |
| ISSN | 0021-4922 |
| NCID | AA12295836 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 論文のバージョン | author |
| DOI | 10.35848/1347-4065/abe2e5 |
| Web of Science KeyUT | 000621475200001 |
| 関連URL | isVersionof https://doi.org/10.35848/1347-4065/abe2e5 |
| JaLCDOI | 10.18926/14152 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_39_1_52.pdf |
| 著者 | 金森 克也| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |
| 抄録 | Thermal behavior of Coulomb clusters in a three dimensional confining potential is investigated by molecular dynamics simulations for system sizes of 1,000 to 20,288 ions. The specific heat of the system of shell-structured 20,000 ions is peaked almost at the same temperature as the system of bcc-structured 20,288 ions with much sharper structure for the latter. The diffusion coefficient and the peak to valley ratio of the two-dimensional pair distribution function on the outermost shell are obtained both as a function of temperature. The rotational movement of each shell in the system of 104 ions is observed. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2005-01 |
| 巻 | 39巻 |
| 号 | 1号 |
| 開始ページ | 52 |
| 終了ページ | 55 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308445 |