J. Zhong, Kaiyi Zhang, K. Chao, R. Micnas, S. Robaszkiewicz
The ground state phase diagram of the extended Hubbard model for arbitrary electron density is investigated with the broken-symmetry Hartree approximation. It is found that for two-sublattice orderings, only the charge-order and the antiferromagnetism exist without the mixed phase. Das Phasendiagramm des Grundzustands des ausgedehnten Hubbardmodells fur beliebige Elektronendichte wird mit der Hartree-Naherung gebrochener Symmetrie untersucht. Es wird gefunden, das fur Zwci-Untergitter-Ordnungszustande nur die Ladungs-Ordnung und der Antiferromagnetismus ohne Mischphase existieren.
{"title":"CDW-SDW Transition in the Extended Hubbard Model","authors":"J. Zhong, Kaiyi Zhang, K. Chao, R. Micnas, S. Robaszkiewicz","doi":"10.1002/PSSB.2221330116","DOIUrl":"https://doi.org/10.1002/PSSB.2221330116","url":null,"abstract":"The ground state phase diagram of the extended Hubbard model for arbitrary electron density is investigated with the broken-symmetry Hartree approximation. It is found that for two-sublattice orderings, only the charge-order and the antiferromagnetism exist without the mixed phase. \u0000 \u0000 \u0000 \u0000Das Phasendiagramm des Grundzustands des ausgedehnten Hubbardmodells fur beliebige Elektronendichte wird mit der Hartree-Naherung gebrochener Symmetrie untersucht. Es wird gefunden, das fur Zwci-Untergitter-Ordnungszustande nur die Ladungs-Ordnung und der Antiferromagnetismus ohne Mischphase existieren.","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83024471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1986-12-31DOI: 10.1515/9783112495483-041
P. Moretti, L. Cianchi
{"title":"Mossbauer Lineshape in Presence of Relaxation and Diffusion","authors":"P. Moretti, L. Cianchi","doi":"10.1515/9783112495483-041","DOIUrl":"https://doi.org/10.1515/9783112495483-041","url":null,"abstract":"","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"141 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86015584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1986-12-31DOI: 10.1515/9783112495483-045
B. Kumar
{"title":"Carrier Drift Mobilities in Some Organic Solids","authors":"B. Kumar","doi":"10.1515/9783112495483-045","DOIUrl":"https://doi.org/10.1515/9783112495483-045","url":null,"abstract":"","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83240891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1986-12-31DOI: 10.1515/9783112495483-054
O. Singh, V. P. Gupta
{"title":"Modified P W Theory and X-Ray K Absorption Edge Studies in Zinc Chalcogenides (Ionicity Determination and d Electron Effect on It)","authors":"O. Singh, V. P. Gupta","doi":"10.1515/9783112495483-054","DOIUrl":"https://doi.org/10.1515/9783112495483-054","url":null,"abstract":"","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89191522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The angular dependences of photoemission are measured in Bragg diffraction of X-rays on germanium and silicon crystals covered with amorphous layers of various thickness. The function K(z) – the integral of electron escape probability versus generation depth – is obtained from the experimental data. The escape depth is found to be substantially lower than the estimates often used whereas K(z) is satisfactorily described by Liljequist's theory. In the photoeffect technique, the depth of the explored layer depends on the primary-to-secondary electron recording efficiency ratio. The capabilities of two methods of deep scanning – by changing the initial energy of electrons by a variation of the radiation wavelength and by means of the escape energy selection of electrons – are compared. [Russian Text Ignored].
{"title":"Determination of the Photoemission Generation Depth with Use of Experiments on the Dynamic Scattering of X-Rays","authors":"M. V. Kruglov, I. K. Solomin, A. Lunev","doi":"10.1002/PSSB.2221330105","DOIUrl":"https://doi.org/10.1002/PSSB.2221330105","url":null,"abstract":"The angular dependences of photoemission are measured in Bragg diffraction of X-rays on germanium and silicon crystals covered with amorphous layers of various thickness. The function K(z) – the integral of electron escape probability versus generation depth – is obtained from the experimental data. The escape depth is found to be substantially lower than the estimates often used whereas K(z) is satisfactorily described by Liljequist's theory. In the photoeffect technique, the depth of the explored layer depends on the primary-to-secondary electron recording efficiency ratio. The capabilities of two methods of deep scanning – by changing the initial energy of electrons by a variation of the radiation wavelength and by means of the escape energy selection of electrons – are compared. \u0000 \u0000 \u0000 \u0000[Russian Text Ignored].","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"83 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85604382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1986-12-31DOI: 10.1515/9783112495483-063
R. Herrmann, U. Preppernau, M. Glifiski
{"title":"Thermopower Measurements on the Two-Dimensional Electron Gas of a Grain Boundary in an InSb Bicrystal ń","authors":"R. Herrmann, U. Preppernau, M. Glifiski","doi":"10.1515/9783112495483-063","DOIUrl":"https://doi.org/10.1515/9783112495483-063","url":null,"abstract":"","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90943039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Corrected formulae for the total energy distribution, the emission current density, and the inversion temperature are derived under the condition that the field-electron emission takes place from a free-electron metal. The corrections relate to the series truncation approximating the WKB phase integral inherent in the analytic approximation of the electron tunneling probability. The assumed approximation for the phase integral takes into account not only the zero and first order terms, present in the existing theory, but also the quadratic term. The expression for the total energy distribution, obtained on this basis, is in typical circumstances valid for field emission in the electron energy range of |e| ≦ 1.5 eV with respect to the Fermi energy. The accuracy of the approximations used is also discussed. Unter der Voraussetzung, das die Feldemission des Metalls durch das Freie-Elektronen-Modell beschrieben wird, werden korrigierte Formeln fur die totale Energieverteilung, die Emissionsstromdichte und die Inversionstemperatur abgeleitet. Die Korrektion erfolgt durch entsprechendes Abbrechen einer Reihe, die das WKB-Phasenintegral approximiert, was immer mit einer analytischen Naherung der Tunnelwahrscheinlichkeit des Elektrons verbunden ist. Die Approximation des Phasenintegrals berucksichtigt nicht nur die Glieder nullter und erster Ordnung, wie in der existierenden Theorie, sondern auch das Glied zweiter Ordnung. Die so erzielte Formel fur die gesamte Energieverteilung gilt unter typischen Feldemissionsverhaltnissen im Bereich der relativ zur Fermi-Energie gemessenen Elektronenenergie |e| ≦ 1,5 eV. Die Genauigkeit der angewendeten Approximation wird eingehend diskutiert.
在自由电子金属场电子发射的条件下，导出了总能量分布、发射电流密度和反转温度的修正公式。修正与电子隧穿概率解析近似中固有的WKB相位积分的序列截断有关。相位积分的假设近似不仅考虑了现有理论中存在的零阶和一阶项，而且还考虑了二次项。在此基础上得到的总能量分布表达式，在典型情况下适用于场发射中电子能量< e < 1.5 eV相对于费米能量的范围。文中还讨论了所用近似的精度。在Voraussetzung的指导下，die Feldemission des metals(自由电子模型)、die ferdemission des metals(自由电子模型)、die ferdemission(自由电子模型)、die ferdemission(自由电子模型)、die ferdemission(自由电子模型)、die ferdemission(自由电子模型)、die ferdemission(自由电子模型)、die ferdemission(能量模型)、die emission(发射模型)和die inverse temperature(可逆温度模型)。“相位积分近似”(wkb - phase - integral approximate)是一种基于“相位积分近似”(wkb - phase - integral approximate)的分析方法。模态积分的模态逼近是指在已有的模态理论中，模态积分的模态逼近和模态积分的模态逼近，以及模态积分的模态逼近。死所以erzielte Formel皮毛对Energieverteilung镀金unt typischen Feldemissionsverhaltnissen im德国der relativ苏珥Fermi-Energie gemessenen Elektronenenergie | e |≦1 5电动汽车。近似法是一种近似法。
{"title":"The Second-Order Correction to Field-Electron-Emission Formulae for an Extended Temperature Range","authors":"C. J. Workowski","doi":"10.1002/PSSB.2221330122","DOIUrl":"https://doi.org/10.1002/PSSB.2221330122","url":null,"abstract":"Corrected formulae for the total energy distribution, the emission current density, and the inversion temperature are derived under the condition that the field-electron emission takes place from a free-electron metal. The corrections relate to the series truncation approximating the WKB phase integral inherent in the analytic approximation of the electron tunneling probability. The assumed approximation for the phase integral takes into account not only the zero and first order terms, present in the existing theory, but also the quadratic term. The expression for the total energy distribution, obtained on this basis, is in typical circumstances valid for field emission in the electron energy range of |e| ≦ 1.5 eV with respect to the Fermi energy. The accuracy of the approximations used is also discussed. \u0000 \u0000 \u0000 \u0000Unter der Voraussetzung, das die Feldemission des Metalls durch das Freie-Elektronen-Modell beschrieben wird, werden korrigierte Formeln fur die totale Energieverteilung, die Emissionsstromdichte und die Inversionstemperatur abgeleitet. Die Korrektion erfolgt durch entsprechendes Abbrechen einer Reihe, die das WKB-Phasenintegral approximiert, was immer mit einer analytischen Naherung der Tunnelwahrscheinlichkeit des Elektrons verbunden ist. Die Approximation des Phasenintegrals berucksichtigt nicht nur die Glieder nullter und erster Ordnung, wie in der existierenden Theorie, sondern auch das Glied zweiter Ordnung. Die so erzielte Formel fur die gesamte Energieverteilung gilt unter typischen Feldemissionsverhaltnissen im Bereich der relativ zur Fermi-Energie gemessenen Elektronenenergie |e| ≦ 1,5 eV. Die Genauigkeit der angewendeten Approximation wird eingehend diskutiert.","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"80 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82138901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1986-12-31DOI: 10.1515/9783112495483-053
Zheng Siming
{"title":"The Combined Effect of Crystal-Field Anisotropy and Biquadratic Exchange in a Heisenberg Ferromagnet","authors":"Zheng Siming","doi":"10.1515/9783112495483-053","DOIUrl":"https://doi.org/10.1515/9783112495483-053","url":null,"abstract":"","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82248794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1986-12-31DOI: 10.1515/9783112495483-059
D. Wruck, F. Spiegelberg
{"title":"Metastable Species of Oxygen-Related Donors in Silicon","authors":"D. Wruck, F. Spiegelberg","doi":"10.1515/9783112495483-059","DOIUrl":"https://doi.org/10.1515/9783112495483-059","url":null,"abstract":"","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"111 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85338403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The energy loss of slow atoms is studied from the viewpoint of the indirect excitation of low-energy electron–hole pairs, i.e., the excitations of electron–hole pairs through the electron exchange process from the metal to the projectile's atomic states, and vice versa. For the slow atom, v ≪ vF (v and vF are the velocity of the projectile and the Fermi velocity, respectively), electrons have enough velocity for response, thus the atomic states are not well defined due to the screening effect and the electron exchange processes. By constructing the model Hamiltonian which describes such effects from first principles the stopping power at grazing incidence condition, especially for the Cs surface, is calculated. Der Energieverlust langsamer Atome wird vom Standpunkt einer indirekten Anregung von niederenergetischen Elektronen–Loch-Paaren untersucht, d. h. die Anregungen von Elektronen–Loch-Paaren durch den ElektronenaustauschprozeB vom Metall zu den atomaren Zustanden des Projektils und umgekehrt. Fur langsame Atome, v ≪ vF (v und vF sind die Geschwindigkeiten des Projektils bzw. die Fermigeschwindigkeit) haben die Elektronen genugend Energie fur Response, somit sind die atomaren Zustande infolge des Abschirmeffekts und der Elektronenaustauschprozesse nicht gut definiert. Durch Konstruktion eines Modellhamiltonians, der solche Effekte von den ersten Prinzipien her beschreibt, wird die Bremsleistung bei streifendem Einfall, speziell fur die Cs-Oberflache, berechnet.
从低能电子空穴对间接激发的角度研究慢原子的能量损失，即从金属到弹丸原子态的电子交换过程中电子空穴对的激发，反之亦然。对于慢原子，v≪vF (v和vF分别是抛射体的速度和费米速度)，电子有足够的速度进行反应，因此由于屏蔽效应和电子交换过程，原子状态不能很好地确定。通过建立从第一性原理出发描述这种效应的模型哈密顿量，计算了在掠入射条件下的停止功率，特别是对于Cs面。Der Energieverlust langsamer原子风与原子风之间的相互作用(interrekkgen von niederderenergetischen Elektronen-Loch-Paaren unterschen)， d. die energengen von Elektronen-Loch-Paaren durschen elektronenaustuschprozeb . metal and atomaren Zustanden des Projektils and umgekehrt)。对于langsame atom, v ' f (v)和v ' f (v)和v ' f (v)和v ' f (v)是Geschwindigkeiten des Projektils bzw。fermigeschwindikeit)是die electroniconengengengend energy of Response的缩写，它涉及到abschirmeeffetes和derelektronenaustauschprozesse的定义。德国哈密顿模型工程，德国德国德国，德国德国，德国德国，德国德国，德国德国，德国德国，德国德国。
{"title":"Stopping Power of Atoms near Metal Surfaces at Grazing Incidence Condition","authors":"M. Kato, Y. Ohtsuki","doi":"10.1002/PSSB.2221330131","DOIUrl":"https://doi.org/10.1002/PSSB.2221330131","url":null,"abstract":"The energy loss of slow atoms is studied from the viewpoint of the indirect excitation of low-energy electron–hole pairs, i.e., the excitations of electron–hole pairs through the electron exchange process from the metal to the projectile's atomic states, and vice versa. For the slow atom, v ≪ vF (v and vF are the velocity of the projectile and the Fermi velocity, respectively), electrons have enough velocity for response, thus the atomic states are not well defined due to the screening effect and the electron exchange processes. By constructing the model Hamiltonian which describes such effects from first principles the stopping power at grazing incidence condition, especially for the Cs surface, is calculated. \u0000 \u0000 \u0000 \u0000Der Energieverlust langsamer Atome wird vom Standpunkt einer indirekten Anregung von niederenergetischen Elektronen–Loch-Paaren untersucht, d. h. die Anregungen von Elektronen–Loch-Paaren durch den ElektronenaustauschprozeB vom Metall zu den atomaren Zustanden des Projektils und umgekehrt. Fur langsame Atome, v ≪ vF (v und vF sind die Geschwindigkeiten des Projektils bzw. die Fermigeschwindigkeit) haben die Elektronen genugend Energie fur Response, somit sind die atomaren Zustande infolge des Abschirmeffekts und der Elektronenaustauschprozesse nicht gut definiert. Durch Konstruktion eines Modellhamiltonians, der solche Effekte von den ersten Prinzipien her beschreibt, wird die Bremsleistung bei streifendem Einfall, speziell fur die Cs-Oberflache, berechnet.","PeriodicalId":11087,"journal":{"name":"Day 1 Tue, January 11, 2022","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1986-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79781277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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