研究・研究者
研究会・セミナー
| 演 題 | 「Momentum microscopy: Spin-resolved images of the electronic structure」 |
|---|---|
| 日 時 | 2017年03月27日(月) 15:00 |
| 講演者 | Dr. Christian Tusche （Forschungszentrum Jülich&Universität Duisburg-Essen） |
| 場 所 | 分子科学研究所 研究棟3階 301号室 |
| 概 要 |
A fundamental concept in solid state physics describes the degrees of freedom of electrons in a solid by the relation of the energy E vs. the crystal momentum k in a band structure of independent quasi particles. Of particular importance is the spin of the electron, that gives rise to phenomena like ferromagnetism, superconductivity, spin-polarized surface states, and recently, the discovery of new material classes with complex spin textures like topological insulators. On the experimental side, the novel concept of momentum microscopy evolved to provide an intuitive and comprehensive insight to these band structures. A momentum microscope captures the complete 2π solid angle of emitted photoelectrons into a high resolution image of electronic states in reciprocal space [1]. With the introduction of imaging spin analyzers the efficiency of spin-resolved measurements experienced a tremendous boost, such that the electron spin now becomes routinely accessible in photoemission experiments. We will discuss applications and prospects, including spin-textures in the presence of large spin-orbit interaction [2], the interplay of spin-orbit- and exchange-interaction in ferromagnets [3], and rapid band structure mapping by time-of-flight momentum microscopy [4]. |
| お問合せ先 | 田中 清尚 |
