Risultati di ricerca

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.

< 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

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

PRIN Project Nanowires (NWs) are quasi-1D crystals with nanoscale diameters and several microns in length. This project aims at growing and thoroughly investigating quantum dots (QDs) and superlattices (SLs) in two different III-V NW heterostructures: GaAsP/GaP NWs, for photonic and optoelectronic applications in the visible-near infrared range, and InAsP/InP NWs, for telecom-wavelengths applications. The well-known vapor-liquid-solid growth approach will be employed to realize bottom-up NWs incorporating QDs of controllable size, position and chemical composition. In particular, we will use the chemical beam epitaxy technique, which combines the advantages of ultra-high-vacuum epitaxial growth with the ease of use and flexibility given by metalorganic precursor gas sources. The controlled NW morphology and diameter will be exploited for the optimization of the waveguiding properties of NWs for the nested QDs. Scanning electron microscopy (SEM) for morphology characterization and energy dispersive x-ray spectroscopy (EDX) for compositional analysis are performed in-house with a field emission gun (FEG) electron microscope operating up to 30 kV. Electron Beam Lithography (EBL) for substrate patterning is performed instead with a dedicated FEG SEM equipped with an interferometric stage. The CNR unit in Pisa has a remarkable expertise in the growth and structural characterization of III-V semiconductor nanowires, axial and radial nanowire heterostructures, and selective area nanostructures. The Chemical Beam Epitaxy (CBE) system and the cleanroom facility of the National Enterprise for nanoScience and nanoTechnology (NEST) Laboratory of Scuola Normale Superiore, where the Nanoscience institute of CNR is headquartered are fully available for the project.The CBE is equipped with a Riber Compact-21 growth chamber with an integrated Reflection of High Energy Electron Diffraction (RHEED) system for in-situ monitoring and an optical pyrometer for the substrate temperature measurement. Available group-V materials are arsenic (TBAs), phosphorous (TBP), and antimony (TDMASb and TMSb); for group III there are indium (TMIn), gallium (TEGa), and aluminium (TMAl) precursors. Transmission electron microscopy (TEM) to investigate the nanowires structural quality (crystal phase, interface sharpness, strain distribution) is also performed by the CNR unit, in collaboration with the Center for Instrument Sharing (CISUP) of the University of Pisa. R. Sorodoc, P. De Vincenzi, ACS Appl. Mater. Interfaces 16, 47 (2024) The growth and the structural characterization of the NWs performed at the CNR unit is cross-correlated to advanced optical spectroscopy experiments (inelastic light scattering and photoluminescence) carried out at Sapienza University. The optical measurements are performed also with a photon-correlation setup to probe the properties of the grown QDs. The close synergy of the two units allows a continuous flow of samples and information. In this way, a full picture of the structural, electronic, and optical properties of the QDs and SLs in NWs is achieved and controllably tuned. Single QDs in NWs with high brightness and low multi-photon emission probability are being realized within this project, as well SLs with a tunable period, in order to determine the new type of band alignment arising in the SL and show the potential of these SLs for NW-based optoelectronic applications such as photodetectors. Furthermore, NWs with GaAsP (with varying concentrations of As and P) in the wurtzite phase were created to study the new optical and electronic properties of the material in this new crystalline phase. The results of this study are then used as a starting point to better understand the effects of quantum confinement in the previously mentioned samples. Team members: Dr. Valentina Zannier, CNR researcher Prof. Marta De Luca, Sapienza University professor Prof. Lucia Sorba, CNR research director Robert Andrei Sorodoc, CNR fellow Paolo De Vincenzi, PhD student of Sapienza University Giada Bucci, PhD student of Scuola Normale Superiore Publications: Tunable GaAsxP1-x quantum dot emission in wurtzite GaP Nanowires . R. Andrei Sorodoc+, P. De Vincenzi+, A. Sagar Sharma, G. Bucci, M. Roggi, E. Mugnaioli, L. Sorba, M. De Luca and V. Zannier (+ equal contribution). ACS Appl. Mater. Interfaces 16, 47 (2024) Zincblende InAsxP1–x/InP Quantum Dot Nanowires for Telecom Wavelength Emission. G. Bucci*, V. Zannier, F. Rossi, A. Musiał, J. Boniecki, G. Sęk, L. Sorba. ACS Appl. Mater. Interfaces 16, 20 (2024) InAs–InP Superlattice Nanowires with Tunable Phonon Frequencies, V. Zannier, J. Trautvetter, A. K. Sivan, F. Rossi, D. de Matteis, B. Abad, R. Rurali, L. Sorba, I. Zardo. Advanced Physics Research 3, 6 (2024) Revealing Inclined Twin Related Defects in III–V Nanowires Grown in Popular Alternative Crystallographic Directions, H. A. Fonseka, N. Denis, J. A. Gott, X. Yuan, R. Beanland, H. H. Tan , C. Jagadish, A. M. Sanchez, M. De Luca*. J. Phys. Chem. C, 128, 21593 (2024) Phonon Interference Effects in GaAs-GaP Superlattice Nanowires, C. Arya, J. Trautvetter, J. M. Sojo-Gordillo, Y. Kaur, V. Zannier, A. Nigro, F. Beltram, T. Albrigi, A. Ruiz-Caridad, L. Sorba, R. Rurali I. Zardo*. ACS Nano, 19, 50, 42013–42021 (2025)

< Back A V. Yurgens, J. A. Zuber, S. Flagan, M. De Luca, B. J. Shields, I. Zardo, P. Maletinsky, R. J. Warburton, and T. Jakubczyk 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. Nadine Denis, Akant Sagar Sharma, Elena Blundo, Francesca Santangeli, Paolo De Vincenzi, Riccardo Pallucchi, Mitsuki Yukimune, Alexander Vogel, Ilaria Zardo, Antonio Polimeni, Fumitaro Ishikawa, Marta De Luca, "Bandgap Engineering On Demand in GaAsN Nanowires by Post-Growth Hydrogen Implantation", Small (2025) https://doi.org/10.1002/smll.202506091 2. Nadine Denis; Akant Sagar Sharma; Didem Dede; Timur Nurmamytov; Salvatore Cianci; Francesca Santangeli; Marco Felici; Victor Boureau; Antonio Polimeni; Silvia Rubini; Anna Fontcuberta i Morral; Marta De Luca. "Single Photon Emitters in Thin GaAsN Nanowire Tubes Grown on Si", ACS Nano, 19, 46, 39757–39767(2025). https://doi.org/10.1021/acsnano.5c12139 3. 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. "TiO2 and CaCO3 Microparticles Produced in Aqueous Extracts from Satureja montana: Synthesis, Characterization, and Preliminary Antimicrobial Test", Molecules, 30, 20, 4138 (2025). https://doi.org/10.3390/molecules30204138 Oral Contribution : “Bandgap engineering across telecom wavelengths of InN nanowires by post-growth hydrogen irradiation” Conference: Nanowire Week 2025 Date, where: 25 – 29/08/2025, St John’s College, University of Cambridge, Cambridge, UK Invited Talk : “Giant bandgap tuning of InN nanowires by post-growth Hydrogen irradiation for creation of tunable quantum dots” Conference/Institution: Université de Rouen Date, where : 21 – 25/04/2025, Rouen, France Poster : “Bandgap manipulation of nanowires by post-growth hydrogenation” Conference/Institution : Dipartimento di Fisica, Università Sapienza di Roma – Evento dipartimentale She Rocks Science 2025 Date, where : 07/03/2025, Rome, Italy Oral Contribution : “Giant bandgap tuning of InN nanowires by post-growth Hydrogen irradiation for creation of tunable quantum dots” Conference/Institution : Nanoinnovation, Sapienza Università di Roma Date, where : 09 – 13/09/2024, Rome, Italy Poster : “Giant bandgap tuning of InN nanowires by post-growth Hydrogen irradiation for creation of tunable quantum dots” Conference/Institution : Dipartimento di Fisica, Università Sapienza di Roma – Evento dipartimentale She Rocks Science 2024 Date, where : 12/02/2024, Rome, Italy Poster : “Giant bandgap tuning of InN nanowires by post-growth hydrogen irradiation” Conference/Institution : Quantum Technology from fundamental science to real world applications – Postgraduate Summer School, Ettore Majorana Foundation, Erice Date, where : 02 – 07/10/2023, Erice, Italy Poster : “Development of RSV-loaded liposomes to investigate the delivery across the Blood Brain Barrier” Conference/Institution : First Symposium for YouNg Chemists: Innovation and Sustainability, Dipartimento di Chimica, Università Sapienza di Roma Date, where : 20 – 23/06/2022, Rome, Italy