Ilmu agama dan kontribusinya terhadap penyelesaian masalah dalam dunia yang plural

Catatan: Tesis ini disusun bersama oleh kedua penulis dan dipresentasikan untuk dibahas dengan para kolega dan mahasiswa di Jawa, di Universitas Kristen Satya Wacana, Salatiga (April 2003), IAIN Sunan Kalijaga, Yogyakarta (April 2003), Universitas Muhammadiyah, Surakarta (April 2003) dan IAIN Walisongo, Semarang (Desember 2003). IAIN adalah kependekan untuk Institut Agama Islam Negeri. Penulis berterimakasih atas diskusi yang sangat menarik yang diadakan di institusi-institusi tersebut, yang menghasilkan beberapa formulasi ulang pada teks aslinya. Tesis ini kemudian dibahas, tanpa diubah, pada seminar di Universitas Hannover dan Marburg, Jerman

Magnetic anisotropy in Shiba bound states across a quantum phase transition

The exchange coupling between magnetic adsorbates and a superconducting substrate leads to Shiba states inside the superconducting energy gap and a Kondo resonance outside the gap. The exchange coupling strength determines whether the quantum many-body ground state is a Kondo singlet or a singlet of the paired superconducting quasiparticles. Here, we use scanning tunneling spectroscopy to identify the different quantum ground states of Manganese phthalocyanine on Pb(111). We observe Shiba states, which are split into triplets by magnetocrystalline anisotropy. Their characteristic spectral weight yields an unambiguous proof of the nature of the quantum ground state.Comment: 6 pages, 4 figure

A Hybrid Approach to Assignment of Library of Congress Subject Headings

Library of Congress Subject Headings (LCSH) are popular for indexing library records. We studied the possibility of assigning LCSH automatically by training classifiers for terms used frequently in a large collection of abstracts of the literature on hand and by extracting headings from those abstracts. The resulting classifiers reach an acceptable level of precision, but fail in terms of recall partly because we could only train classifiers for a small number of LCSH. Extraction, i.e., the matching of headings in the text, produces better recall but extremely low precision. We found that combining both methods leads to a significant improvement of recall and a slight improvement of F1 score with only a small decrease in precision

End states and subgap structure in proximity-coupled chains of magnetic adatoms

A recent experiment [Nadj-Perge et al., Science 346, 602 (2014)] provides evidence for Majorana zero modes in iron (Fe) chains on the superconducting Pb(110) surface. Here, we study this system by scanning tunneling microscopy using superconducting tips. This high-resolution technique resolves a rich subgap structure, including zero-energy excitations in some chains. We compare the symmetry properties of the data under voltage reversal against theoretical expectations and provide evidence that the putative Majorana signature overlaps with a previously unresolved low-energy resonance. Interpreting the data within a Majorana framework suggests that the topological gap is significantly smaller than previously believed. Aided by model calculations, we also analyze higher-energy features of the subgap spectrum and their relation to high-bias peaks which we associate with the Fe d-bands.Comment: 5+5 pages, 5+6 figure