Title: Electronic Structure of a Graphene-like Artificial Crystal of NdNiO3
Authors: Arab, Arian
Liu, Xiaoran
Köksal, Okan
Yang, Weibing
Chandrasena, Ravini U.
Middey, Srimanta
Kareev, Mikhail
Kumar, Siddharth
Huşanu, Marius Adrian
Yang, Zhenzhong
Gu, Lin
Strocov, Vladimir N.
Lee, Tienlin
Minár, Jan
Pentcheva, Rossitza
Chakhalian, Jacques A.
Gray, Alexander X.
Citation: ARAB, A., LIU, X., KÖKSAL, O., YANG, W., CHANDRASENA, R. U., MIDDEY, S., KAREEV, M., KUMAR, S., HUŞANU, M. A., YANG, Z., GU, L., STROCOV, V. N., LEE, T., MINÁR, J., PENTCHEVA, R., CHAKHALIAN, J. A., GRAY, A. X. Electronic Structure of a Graphene-like Artificial Crystal of NdNiO3. Nano letters, 2019, roč. 19, č. 11, s. 8311-8317. ISSN 1530-6984.
Issue Date: 2019
Publisher: American Chemical Society
Document type: článek
URI: 2-s2.0-85074911191
ISSN: 1530-6984
Keywords in different language: Strongly correlated oxides;soft X-ray angle-resolved photoelectron spectroscopy;hard X-ray photoelectron spectroscopy
Abstract in different language: Artificial complex-oxide heterostructures containing ultrathin buried layers grown along the pseudocubic [111] direction have been predicted to host a plethora of exotic quantum states arising from the graphene-like lattice geometry and the interplay between strong electronic correlations and band topology. To date, however, electronic-structural investigations of such atomic layers remain an immense challenge due to the shortcomings of conventional surface-sensitive probes with typical information depths of a few angstroms. Here, we use a combination of bulk-sensitive soft X-ray angle-resolved photoelectron spectroscopy (SX-ARPES), hard X-ray photoelectron spectroscopy (HAXPES), and state-of-the-art first-principles calculations to demonstrate a direct and robust method for extracting momentum-resolved and angle-integrated valence-band electronic structure of an ultrathin buckled graphene-like layer of NdNiO3 confined between two 4-unit cell-thick layers of insulating LaAlO3. The momentum-resolved dispersion of the buried Ni d states near the Fermi level obtained via SX-ARPES is in excellent agreement with the first-principles calculations and establishes the realization of an antiferro-orbital order in this artificial lattice. The HAXPES measurements reveal the presence of a valence-band bandgap of 265 meV. Our findings open a promising avenue for designing and investigating quantum states of matter with exotic order and topology in a few buried layers.
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© American Chemical Society
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