|Title:||Electronic Structure of a Graphene-like Artificial Crystal of NdNiO3|
Chandrasena, Ravini U.
Huşanu, Marius Adrian
Strocov, Vladimir N.
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.|
|Publisher:||American Chemical Society|
|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  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.|
|Rights:||Plný text není přístupný.|
© American Chemical Society
|Appears in Collections:||Články / Articles (RAM)|
Files in This Item:
|Minar_ALK+19_Alex_Gray_NNO_Arab_NNO_111_Nano_Lett_2019.pdf||4,56 MB||Adobe PDF||View/Open Request a copy|
Please use this identifier to cite or link to this item:
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.