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Kemunculan Kemunculan Rashba Splitting Intrinsik pada Monolayer Janus Si2SbBi: Studi Komputasi Berdasarkan Teori Fungsional Densitas Affandi, Yusuf; Darojat, Yusron; Anshory, Muhammad; Masfufah, Awi
Journal of Energy, Material, and Instrumentation Technology Vol 5 No 1 (2024): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v5i1.239

Abstract

In this paper, we investigate the electronic structure of Janus Si2SbBi monolayer and compare it with the non-polar systems Si2Bi2 and Si2Sb2 monolayer based on Density Functional Theory (DFT) calculation. According to the first-principles calculation, these systems exhibit semiconductor properties with energy gaps are 0.674 eV, 0.28 eV, and 1.13 eV for Janus Si2SbBi, Si2Bi2, and Si2Sb2, respectively. In addition, the intrinsic Rashba splitting is also observed around the Γ Point on conduction band minimum (CBM) in the electronic structure of Si2SbBi monolayer, which is not found in Si2Sb2 and Si2Bi2 monolayer systems. This Rashba splitting phenomenon we analyze by using the perturbation theory based on symmetry group and get the first-order Rashba Parameter α1=1.84 eVÅ , and α1=1.73 eVÅ , for Γ-K and Γ-M direction, respectively. With the strong intrinsic Rashba Splitting, the Janus Si­2SbBi monolayer has excellent potential to be the candidate of semiconductor material for spintronics devices.
Pelatihan Optimalisasi Proses Produksi Minyak Kayu Putih Berbasis Green Technology di Unit Pertanian Koperasi Pondok Pesantren (Koppontren) Al-Fatah, Lampung Selatan Sufra, Rifqi; Darojat, Yusron; Nareswari, Tantri Liris; Alhanif, Misbahudin; Yusupandi, Fauzi
Jurnal Kreativitas Pengabdian Kepada Masyarakat (PKM) Vol 8, No 3 (2025): Volume 8 No 3 (2025)
Publisher : Universitas Malahayati Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jkpm.v8i3.18305

Abstract

ABSTRAK Tanaman kayu putih (Melaleuca cajuputi) merupakan tanaman produksi hasil hutan bukan kayu yang pada umumnya dimanfaatkan daunnya untuk menghasilkan minyak kayu putih. Pengrajin minyak atsiri di Koperasi Pondok Pesantren (KOPPONTREN) Al-Fattah, Desa Negara Ratu Kecamatan Natar Kabupaten Lampung Selatan yang merupakan mitra pengabdian telah melakukan usaha pengolahan minyak kayu putih melalui penyulingan sederhana. Namun, rendemen yang dihasilkan hanya berkisar 0,6 – 0,7%. Selain itu, timbulnya limbah hasil pengolahan, murahnya harga jual karena kualitas yang belum baik dan kurangnya pemasaran produk melatarbelakangi kegiatan pengabdian kepada Masyarakat (PkM) ini. Pada kegiatan ini dilakukan peningkatan kualitas produk minyak kayu putih melalui pembuatan alat redistilasi. Sosialiasi pengolahan limbah padat dan cair dalam reaktor SSF Constructed Wetland dengan tanaman rumput wlingi juga dilakukan. Selain itu, pelatihan pemasaran secara digital dan pembuatan desain kemasan dilakukan sebagai pelengkap kegiatan PkM ini. Secara keseluruhan, hasil pelatihan menunjukkan bahwa 86% peserta mengalami peningkatan kemampuan yang signifikan dengan nilai post-test rata-rata 83,8. Hasil ini cukup menggembirakan yang artinya pelaksanaan kegiatan sosialisasi dan praktek penyulingan minyak kayu putih, pengolahan limbah cair dan padat, serta branding produk mampu diikuti dengan baik oleh mitra. Kata Kunci: Branding Produk, Minyak Kayu Putih, Pengolahan Limbah, Redistilasi.  ABSTRACT The eucalyptus plant (Melaleuca cajuputi) is a non-timber forest product that is generally utilized for its leaves to produce eucalyptus oil. Essential oil craftsmen at the Al-Fattah Islamic Boarding School Cooperative (KOPPONTREN), Negara Ratu Village, Natar District, South Lampung Regency, who are our service partners, have been processing eucalyptus oil through simple distillation. However, the produced yield is only around 0.6–0.7%. Additionally, the generation of processing waste, the low selling price due to poor quality, and the lack of product marketing are the reasons behind this Community Service (PkM) activity. This activity improved the quality of eucalyptus oil products by creating a redistillation device. Socialization of solid and liquid waste treatment in the SSF Constructed Wetland reactor with wlingi grass plants was also conducted. In addition, digital marketing training and packaging design creation were conducted as a complement to this PkM activity. Overall, the training results show that 86% of participants experienced a significant improvement in their abilities, with an average post-test score of 83.8. This result is quite encouraging, meaning that the implementation of socialization activities and practices of eucalyptus oil distillation, liquid and solid waste processing, as well as product branding, can be well followed by partners. Keywords: Product Branding, Eucalyptus Oil, Waste Processing, Redistillation.