Browsing by Author "Khan, Muhammad Mansoor"

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Grace Knapp as a missionary teacher in the Ottoman Empire
(Bilkent University, 2018) Syed, Rohail; Farooqi, Asadullah; Khan, Muhammad Mansoor; Nafisifar, Ramtin
Grace Highley Knapp, Osmanlı İmparatorluğu’nda Amerikan misyoneri olarak 22 yıl çalıştı. Orada geçirdiği zamanda birçok olaya tanıklık etti ve bunlar hakkında 2 kitap yazdı. Bu belgenin amacı Knapp’ın yazdıkları ve başka ikincil kaynakların ışığında, savaş esnasında Van ve Bitlis’te yaşayan Ermeni insanların öldürülmesini açıklamaktadır. Ayrıca bu belge Grace Knapp’ın öğretmenliği ve misyonerliği sırasındaki rolüne ve katkılarına da odaklanacaktır. Bu yazı aynı zamanda Grace Knapp gibi misyonerlerin bu olayı Türkler ve Ermeniler açısından nasıl yorumladığını ele almaktadır. Bunun dışında bu yazı Grace Knapp’in rolünden de kısaca bahsetmektedir. Grace Kanpp’in öğretmenlik ve misyonerlik yaptığı dönemde yapmış olduğu bağışlar da bahsedilmektedir.
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Hikmet Barutçugil's contributions to the revival of the Turkish Art of Marbling (Ebru sanatı) 1960s-2000s)
(Bilkent University, 2020) Butt, Fahad Waseem; Alizada, Elnur; Karimova, Shams; Khan, Muhammad Mansoor; Alakrah, Wael; Gurbanzade, Aghazeynal
The Turkish art of marbling (Ebru Sanatı) is a traditional form of art practiced in Turkey. As with how art is a reflection of society, culture and history, marbling has its own contributions to the Turkish culture that is seen today. Artists tend to have a deeper insight and understanding of what their work means and how it is valuable. Therefore, this research is centered around one experienced marbling artist, Hikmet Barutçugil, and especially on his views and role in the revival of marbling in Turkey from the 1960s and onwards.
Open Access
Prolonged dephasing time of ensemble of moiré-trapped interlayer excitons in WSe2-MoSe2 heterobilayers
(Nature Research, 2023-09-11) Durmuş, Mehmet Atıf; Demiralay, Kaan; Khan, Muhammad Mansoor; Atalay, Şeyma Esra; Sarpkaya, Ibrahim
The moiré superlattices of transition metal dichalcogenide heterobilayers have a pronounced effect on the optical properties of interlayer excitons (IXs) and have been intensively studied in recent years. However, the impact of moiré potentials on the temporal coherence of the IXs has not yet been investigated in detail. Here, we systematically investigate the coherence properties of both the ensemble of delocalized and the ensemble of localized IXs trapped in moiré potentials of the hexagonal boron nitride encapsulated WSe2-MoSe2 heterostructures. Our low-temperature first-order correlation measurements show that prolonged T 2 dephasing times with values up to 730 fs can be obtained from the ensemble of localized IXs under moderate pump powers. We observed up to almost a five-fold increase over the values we obtained from the delocalized IXs, while more than two-fold over the previously reported values of T 2 ~ 300 fs from the delocalized IXs. The prolonged values of T 2 dephasing times and narrow photoluminescence (PL) linewidths for the ensemble of moiré-trapped IXs compared to delocalized one indicate that dephasing mechanisms caused by exciton-low energy acoustic phonon and exciton-exciton scattering are significantly suppressed due to the presence of localization potentials. Our pump power-dependent T 2 results show that ultra-long dephasing times can be expected if the dephasing time measurements are performed with the narrow photoluminescence emission line of a single moiré-trapped IX at a low pump power regime. The prolonged values of IX dephasing times would be critical for the applications of quantum information science and the development of two-dimensional material-based nanolasers. © 2023, Springer Nature Limited.