Revealing the EuCd_{2}As_{2} Semiconducting Band Gap via n-type La-Doping

التفاصيل البيبلوغرافية
العنوان: Revealing the EuCd_{2}As_{2} Semiconducting Band Gap via n-type La-Doping
المؤلفون: Nelson, Ryan A., King, Jesaiah, Cheng, Shuyu, Williams, Archibald J., Jozwiak, Christopher, Bostwick, Aaron, Rotenberg, Eli, Sasmal, Souvik, Kao, I-Hsuan, Tiwari, Aalok, Jones, Natalie R., Cai, Chuting, Martin, Emma, Dolocan, Andrei, Shi, Li, Kawakami, Roland, Heremans, Joseph P., Katoch, Jyoti, Goldberger, Joshua E.
سنة النشر: 2024
المجموعة: Condensed Matter
مصطلحات موضوعية: Condensed Matter - Materials Science
الوصف: EuCd_{2}As_{2} has attracted considerable interest as one of the few magnetic Weyl semimetal candidate materials, although recently there have been emerging reports that claim it to have a semiconducting electronic structure. To resolve this debate, we established the growth of n-type EuCd_{2}As_{2} crystals, to directly visualize the nature of the conduction band using angle resolve photoemission spectroscopy (ARPES). We show that La-doping leads to n-type transport signatures in both the thermopower and Hall effect measurements, in crystals with doping levels at 2 - 6 x 10^{17} e^{-} cm^{-3}. Both p-type and n-type doped samples exhibit antiferromagnetic ordering at 9 K. ARPES experiments at 6 K clearly show the presence of the conduction band minimum at 0.8 eV above the valence band maximum, which is further corroborated by the observation of a 0.71 - 0.72 eV band gap in room temperature diffuse reflectance absorbance measurements. Together these findings unambiguously show that EuCd_{2}As_{2} is indeed a semiconductor with a substantial band gap and not a topological semimetal.
نوع الوثيقة: Working Paper
الوصول الحر: http://arxiv.org/abs/2403.02556Test
رقم الانضمام: edsarx.2403.02556
قاعدة البيانات: arXiv