Risultati di ricerca

< Back N. Balakrishnan, G. Pettinari, O. Makarovsky, L. Turyanska, M. W. Fay, M. De Luca, A. Polimeni, M. Capizzi, F. Martelli, S. Rubini and A. Patanè Apply Now Job Type Workspace About the Role Requirements About the Company Apply Now

< Back J. Martín-Sánchez, A. Mariscal, M. De Luca, A. Tarazaga, M.-Luengo, G. Gramse, A. Halilovic, R. Serna, A. Bonanni, I. Zardo, R. Trotta, and A. Rastelli Apply Now Job Type Workspace About the Role Requirements About the Company Apply Now

Projects Single photon emitters in GaAsN nanowire tubes Bandgap engineering and strain engineering by hydrogenation in dilute nitrides nanowires Defect engineering and bandgap control in InN nanowires Tunable quantum dots in GaAsP and InAsP nanowires Micro-ring resonator lasers by self-assembly in InP Size-controlled and site-controlled quantum rings in quantum wells Unveiling new crystalline defects in InP nanowires Spectroscopic investigations on Hybrid 2D Perovskites

Our Goals Nanostructures, such as 2D materials or nanowires, have revolutionized the field of semiconductors, making it possible, among others, to transform indirect bandgap materials to direct bandgap materials, or making it possible for a crystal to grow in a crystal structure that does not exist in bulk. We work in close collaboration with several growth laboratories providing nanostructures, and we functionalize them by several methods, such as hydrogen or helium irradiation, laser heating, thermal annealing, nanoscale patterning etc. to achieve the desired properties. Working at the boundaries between fundamental physics and technological applications, our goal is to achieve new functionalities or explore new physical effects. Advances in Optics and Photonics 13 (2021): 242. However, in the Nano-spectroscopy group we are not happy to work just with nanostructures: we create nanostructures inside the nanostructures. In our vision the nanostructures are scaffolds embedding smaller quantum structures (quantum dots, point defects that emit single photons, quantum rings, quantum wells, etc.) with diverse dimensionalities (0D, 1D, and 2D). For example, in nanowire lasers, by embedding quantum confined structures as active gain media it is possible to enhance the gain and lower lasing threshold. Moreover, by embedding quantum dots in nanowires for quantum photonic applications based on single photon emitters, it can be possible to obtain a higher photon extraction than in standard self-assembled dots embedded in a 3D matrix, owing to the possibility to design the nanowire to act as a waveguide with a photon out-coupler. This makes quantum dots in nanowires the ideal building block of quantum photonic circuits. Furthermore, by embedding quantum rings in quantum wells, one can unveil the topological phase of charge carriers, by controlling the appearance of magnetic states expected due to the circular symmetry of the carrier wavefunction (Aharonov-Bohm effect). Explore our Projects Physics Today 1 September 2009; 62 (9): 38–43

< Back F. Valentini, I. A. Colasanti, C. Zaratti, D. Filimon, A. Macchia, A. Neri, M. Relucenti, M. Reverberi, I. Allegrini, E. Guerriero, M. Cerasa, M. De Luca , F. Santangeli, R. Braglia, F. Scuderi, L. Rugnini, R. Ranaldi, R. De Meis and A. Canini Apply Now Job Type Workspace About the Role Requirements About the Company Apply Now

< Back Xiangyu Lin Research Assistant Curriculum Vitae Publications Summer 2025: Research assistant in Nano-spectroscopy group, Department of Physics, Sapienza University of Rome, Italy. 2020-2023: Master of Science (MSc) in Physics at Niels Bohr Institute, University of Copenhagen, Denmark 2014-2019: Bachelor of Science (BSc) in Physics at Collage of Arts and Science and Bachelor of Engineering (B.E.) in Electrical Engineering at Collage of Engineering, University of Missouri - Columbia, United States Back to Top Office:

Open Positions WHAT WE REQUIRE: Passion for designing and developing new experiments from scratch Thirst for knowledge Excellent communication skills and marked team spirit WHAT WE OFFER: A passionate, young and multidisciplinary group Special attention to diversity, both in gender and in nationality Candidates from all over the world and with all genders are welcomed Post-doc We have one open post-doc position on the ERC grant. Here are the details . PhD Student We have 1 open PhD position. The PhD in Italy lasts 3 years . PhD students do not have teaching duties but only research duties. However, in the first 1.5 years they have to attend courses and give exams. Admission to the PhD schools is very competitive and takes place only once a year, typically in June, for starting the PhD in November. Admission is decided by a committee, not by the Nanospectrosocpy group. However, before applying, you will have to send an email to marta.deluca@uniroma1.it with your CV and short motivation, and you may be asked to do an oral interview with the Nanospectrosocpy group before you submit your application to the PhD schools. There are two main PhD schools. Here you can find information on how to apply and which courses you can attend: PhD school in Physics (https://phd.uniroma1.it/web/PHYSICS_nD3503_EN.aspx ) PhD school in Materials Science (https://phd.uniroma1.it/web/MATHEMATICAL-MODELS-FOR-ENGINEERING,-ELECTROMAGNETICS-AND-NANOSCIENCES_nD3523_EN.aspx ) Master Student We have 2 open positions per year, and about 4-5 different projects. Contact marta.deluca@uniroma1.it to know more about the projects and do a lab tour. We welcome students from different Departments, ranging from Physics to Nanoscience and Chemistry.

< Back M. Felici, A. Polimeni, G. Lavenuta, E. Tartaglini, M. De Luca, M. Capizzi, A. Notargiacomo, R. Carron, D. Fekete, P. Gallo, B. Dwir, A. Rudra, E. Kapon, G. Pettinari, P. C. M. Christianen, J. C. Maan Apply Now Job Type Workspace About the Role Requirements About the Company Apply Now

< Back H. A. Fonseka, A. S. Ameruddin, P. Caroff, D. Tedeschi, M. De Luca, F. Mura, Y. Guo, M. Lysevych, F. Wang, H. H. Tan, A. Polimeni, and C. Jagadish Apply Now Job Type Workspace About the Role Requirements About the Company Apply Now

< Back J. Overbeck, G. Barin, C. Daniels, M. Perrin, O. Braun, Q. Sun, R. Darawish, M. De Luca, X. Wang, T. Dumslaff, A. Narita, Akimitsu; K. Müllen, P. Ruffieux, V. Meunier, R. Fasel, and M. Calame Apply Now Job Type Workspace About the Role Requirements About the Company Apply Now

Publication List Articles Published or under revision in Peer-Reviewed Journals < Back 1. Surfactant Free Platinum Nanoclusters as Fluorescent Probe for the Selective Detection of Fe(III) Ions Anu George, Harikrishnan G., Sukhendu Mandal* (Sens.Actuators B 243 (2017)332- 337). 2. Negative photoresponse of ZnO-PEDOT:PSS nanocomposites and photogating effects Harikrishnan G.*, Sesha Vempati, K Bandopadhyay, K. Prajapati, Vijith Kalathingal and J. Mitra* (Nanoscale Advances,1 (2019)2435). 3. Epsilon-near-zero response in Indium Tin Oxide thin fims: Octave span tuning and IR plasmonics Ben Johns, Navas M P, Harikrishnan G., Akhileshwar Mishra, Ravi Pant, J. Mitra* (Journal of Applied Physics 127(4):043102(2020)). 4. Enhancement in electrical conductivity of a porous indium based metal-organic framework upon 12 uptake: combined experimental and theoretical investigations Mani Prabhu, Mandal Nilangshu, Roopesh Mekkat, Harikrishnan G., Datta Ayan, Mandal Sukhendu* (Journal of Materials Chemistry C 8(14):4836-4842(2020)). 5. Controlling the macroscopic electrical properties of reduced graphene oxide by nanoscale writing of electronic channels Arijit Kayal, Harikrishnan G.,K. Bandopaghyay, Amit Kumar, S. Ravi P. Silva, J.Mitra* (Nanotechnology, 2021.32(17):p.175202). 6. Mobility enhancement in CVD-grown monolayer MoS2 via patterned substrate induced non-uniform straining Arijit Kayal, Sraboni Dey, Harikrishnan G., Nadarajan Renjith, Chattopadhyay Shashwata, J.Mitra* (Nano Lett. 2023, 23, 14, 6629-6636). 7. Anomalous Photoresponse in a Reduced Metal- Semiconductor Hybrid of Nickel and Titanium Oxide Harikrishnan G., K. Bandopadhyay, K. Kolodziejak, Vinayak B Kamble, Dorota A. Pawlak, J.Mitra * (arXiv:2309.17427 [physics.app-ph]). 8. Negative resistance and anomalous transport properties of a porous anisotropic (Ni- TiO2) hybrid system Harikrishnan G., Shashwata Chattopadhyay, K. Bandopadhyay, K. Kolodziejak, Dorota A. Pawlak, J.Mitra * (arXiv:2310.02976 [cond-mat.mtrl-sci]). Poster : “Comprehensive Raman toolkit to probe crystal quality, geometry, and vibrational properties of InN nanowires” Conference: Nanowire Week 2025 Date, where: 25 – 29/08/2025, St John’s College, University of Cambridge, Cambridge, UK Authors: Harikrishnan Gopalakrishnan, Francesca Santangeli, Pietro Todesco, Muhammad Tahir, Ernesto Placidi, Francesco Mura, Zetian Mi, Songrui Zhao, and Marta De Luca.

Our Techniques Room Temperature & Cryogenic Photoluminescence and Raman Spectroscopy Setups In the Nano-spectroscopy Lab we do spectroscopy at the nanoscale on nanostructures. We are expert in the design and realization of customized advanced optical spectroscopy setups for photoluminescence, absorption, and Raman measurements performed in a spatially-resolved manner on single nanostructures. We are able to work at the edge of the light diffraction limit or to beat it with several techniques, such as beam shaping or coupling to AFM tips (near-field optical microscopy), achieving a 50-100 nm spatial resolution. Low-temperature Spectroscopy Setup We have room temperature and cryogenic (closed-cycle cryo-free cryostat) setups, both with positioning accuracy of 50 nm. We apply optical techniques under different experimental conditions (varying excitation power density, sample temperature, light polarization, magnetic fields). By creating our customized setups we maximize signal-to-noise ratio with respect to commercial setups. Tunable Excitation Light We have three extra narrow-band continuous wave lasers and one pulsed light source with tunable wavelength (450-1100 nm) and tunable repetition rate. We have spectrometers and detectors to detect signal from 450 nm to 2100 nm. Second-order autocorrelation Setup We can perform also second-order autocorrelation measurements under continuous wave or pulsed excitation, as well as time resolved photoluminescence spectroscopy. Micromanipulation Setup We are specialized in the micro-manipulation of single nanostructures under optical microscope, and in the integration of nanostructures into new devices. For transfering our low dimensional materials, such as flakes, we have access to the Department facilities coupled to anaerobic chamber. Micromanipulators equipped with tips for fine nanowire placement To perform pick-and-place techniques with nanowires we employ glass or metal needles (100 nm to 500 nm of tip radius). Nanowire on TEM Grid Pick-and-place allows to pick up selected nanowires from the growth chip and transfer them to TEM grids for further investigation.