Michael N. Leuenberger, Ph.D.

Education
 Postdoctoral, 8/20047/2005
University of California, San Diego  Postdoctoral, 11/20027/2004
University of Iowa, Iowa City  Postdoctoral, 5/200210/2002
University of Basel, Switzerland  Ph.D. in theoretical physics
University of Basel, Switzerland  M.S./B.Sc. in theoretical physics
University of Basel, Switzerland
Group Members
Current Members
PhD students:
Muhammad Waqas ShabbirFormer Group Members
PostDocs:
Mikhail ErementchoukVolodymyr Turkowski
PhD students:
Gabriel GonzalezSergio Tafur
Hubert Seigneur
Cathrine Shepard (REU student)
Hari P. Paudel
Ahmed Elhalawany
Mahtab Khan
Alireza Safaei
Research
 Quantum Information Science: Quantum optics based on semiconductor and topological insulator materials, optically mediated quantum information processing with qubits defined in quantum dots that are embedded in nanocavities inside a photonic crystal, quantum cryptography.
 Wideband Gap Semiconductor Materials: Study nonlinear optical effects, such as 4wave mixing spectroscopy, manyexciton correlations, singlephoton and manyphoton entangledphoton sources.
 Topological Insulator and Weyl Semimetal Materials: Study electronic properties of nanostructures linear and nonlinear optical effects, plasmonic effects.
 Graphene: Model midIR photodetectors and midIR thermal emitters based on the plasmonically enhanced photothermoelectric effect.
 2D materials beyond graphene: Investigate and model transistors, photodetectors, and sensors based on 2D layered materials. Identify defects suitable for singlephoton sources.
 Plasmonics in hybrid metalsemiconductor materials: Model light and voltagecontrolled switches to control the propagation of surface plasmon polaritons.
 Photovoltaics: Develop new nanoparticles for solar energy harvesting, luminescent solar energy concentration for improving current solar panels.
 Water splitting: Develop new nanoparticles for improved photocatalysis.
Quantum Information Science


Quantum Teleportation

Current Funding
 DARPA Young Faculty Award: Hightemperature electrically driven Mbps singlephoton source at telecom wavelengths,
PI: Leuenberger, 8/20082/2010  UCF Office of Research: Numerical Renormalization Group Techniques
PI: Leuenberger, 5/2007  4/2008  NSF: Modeling of a Photonic Crystal Hosting a Quantum Network Made of Single Spins in Quantum Dots that Interact via Single Photons
PI: Leuenberger, 9/2007  8/2010
Selected Publications
 Alireza Safaei, Sayan Chandra, Muhammad Waqas Shabbir, Michael N. Leuenberger, Debashis Chanda, Dirac plasmonassisted asymmetric hot carrier generation for roomtemperature infrared detection, Nature Communications 10, 3498 (2019). We demonstrate theoretically and experimentally that the plasmonassisted photothermoelectric effect in asymmetrically nanopatterned graphene can be used to detect midIR light with detectivity of D*=109 J at room temperature.
 Chandriker K. Dass, M. A. Khan, Genevieve Clark, Je_rey A. Simon, Michael N. Leuenberger, Ricky Gibson, Shin Mou, Xiaodong Xu, Joshua R. Hendrickson, UltraLong Lifetimes of Defect Trapped Single Quantum Emitters in Monolayer WSe2/hBN Heterostructures, Adv. Quantum Technol. 2, 1900022 (2019). We show theoretically and experimentally identify possible candidates for the defects in monolayer WSe2 that can be used a singlephoton emitters with ultralong lifetimes.
 Alireza Safaei, Sayan Chandra, Michael N. Leuenberger, Debashis Chanda, Wide Angle Dynamically Tunable Enhanced Infrared Absorption on LargeArea Nanopatterned Graphene, ACS Nano 13, 421 (2019). We show theoretically and experimentally that nanopatterned graphene exhibits strong midIR light absorption at wide angles of incidence.
 M. A. Khan, Michael N. Leuenberger, Roomtemperature superparamagnetism due to giant magnetic anisotropy in MoS defected single layer MoS2, J. Phys.: Condens. Matter 30, 155802 (2018). We show theoretically that MoS defects in MoS2 exhibit a large magnetic moment with a giant magnetic anisotropy.
 Mahtab A. Khan, Mikhail Erementchouk, J. Hendrickson, Michael N. Leuenberger, Electronic and optical properties of vacancy defects in singlelayer transition metal dichalcogenides, Phys. Rev. B 95, 245435 (2017). We theoretically characterized the bound states of vacancy defects and their optical properties in a variety of transition metal dichalcogenides.
 Mikhail Erementchouk, M. A. Khan, Michael N. Leuenberger, Optical signatures of states bound to vacancy defects in monolayer MoS2, Phys. Rev. B Rapid Communications 92, 075439(R) (2015). We theoretically characterized the bound states of vacancy defects and their optical properties in MoS2.
 Alireza Safaei, S. Chandra, A. VazquezGuardado, J. Calderon, D. Franklin, L. Tetard, L. Zhai, Michael N. Leuenberger, D. Chanda, Dynamically tunable extraordinary light absorption in monolayer graphene, Phys. Rev. B 96, 165431 (2017). We show that nanopatterned graphene exhibits an extraordinarily large absorption compared to pristine graphene.
 Muhammad R. Islam, Narae Kang, Udai Bhanu, Hari P. Paudel, Mikhail Erementchouk, Laurene Tetard, Michael N. Leuenberger, Saiful I. Khondaker, Tuning the electrical property via defect engineering of single layer MoS2 by oxygen plasma, Nanoscale 6, 10033 (2014). This work proposes a new method to tune the conductivity of a single layer of MoS2 using oxygen plasma exposure.
 Hari P. Paudel, Michael N. Leuenberger, Threedimensional topological insulator quantum dot for optically controlled quantum memory and quantum computing, Phys. Rev. B 88, 085316 (2013). Here we propose a novel method to implement optically mediated quantum memory and quantum computing with quantum dots made of 3D topological insulator material. The optical control is based on the classical and singlephoton Faraday rotation due to the Pauli exclusion principle. We show that this effect is large for surfaces of 3D topological insulators and also for quantum dots made of 3D topological insulator material.
 Hari P. Paudel, Michael N. Leuenberger, Lightcontrolled plasmon switching using hybrid metalsemiconductor nanostructures, Nano Lett. 12, 2690 (2012). Here we propose a novel switching mechanism for controlling the propagation of surface plasmon polaritons (SPPs) through a chain of AgGaN coreshell nanoparticles, where the switching sites are replaced by AgTiO2 coreshell nanoparticles. The main idea is to excite electronhole pairs inside TiO2, which changes the index of refraction
 Sergio Tafur, Michael N. Leuenberger, Single Photon Near Field Emission and Revival in Quantum Dots, Rev. Nanosci. Nanotechnol. 1, 152161 (2012) and Proc. SPIE 8057, 805704 (2011). In this work we describe the spontaneous emission of a single photon from a single quantum dot by means of the single photon wave function. We obtain analytically three poles that lead to new nearfield revival phenomena. The frequencies/poles of these nearfield oscillations correspond to the energy uncertainty due to the localization of the energy inside the quantum dot.
 Mikhail Erementchouk, Michael N. Leuenberger, Complex dynamics of photon entanglement in the twomode JaynesCummings model, Nanotechnology 21, 274019 (2010). This work demonstrates that the interaction of many photons with a single quantum dot inside a nanocavity yields highly entangled manyphoton states, which can be used for entangled manyphoton sources.
 M. Erementchouk, M. N. Leuenberger, Entanglement of photons due to nonlinear response of quantum wells, Phys. Rev. B 81, 195308 (2010). Here we propose a method to create entangled photons with high efficiency using the manybody correlations among excitons in a quantum well.
 H. P. Seigneur, Michael N. Leuenberger, Winston V. Schoenfeld, Single photon MachZehnder interferometer for quantum networks based on the Single Photon Faraday Effect, J. Appl. Phys. 104, 014307 (2008). This work describes the novel concept of using the conditional singlephoton Faraday rotation to perform singlequbit gates on the polarization degree of freedom for photons by means of a MachZehnder interferometer.
 G. Gonzalez, M. N. Leuenberger, Berryphase blockade in singlemolecule magnets, Phys. Rev. Lett. 98, 256804 (2007). This paper demonstrates singleelectron transistor (SET) effects in the Coulomb blockade regime for the quantum transport through molecular magnets. In particular, it is shown that the topological Berryphase interference effect leads to a Berryphase blockade of the current through a singlemolecule magnet.
 M. Erementchouk, M. N. Leuenberger, and L. J. Sham, Manybody interaction in semiconductor probed with 2D Fourier spectroscopy, Phys. Rev. B 76, 115307 (2007). In this work we provided a microscopic theory that links the measured peaks in the 2D Fourier spectroscopy with the manybody correlations, thereby distinguishing clearly between quantum statistical and Coulomb effects.
 M. N. Leuenberger, Faulttolerant quantum computing with spins using the conditional Faraday rotation, Phys. Rev. B 73, 075312 (2006). This paper is the basis for quantum computing proposed in the project on the quantum network inside a photonic crystal.
 M. N. Leuenberger, M. E. Flatte, D. D. Awschalom, Teleportation of electronic manyqubit states via single photons, Phys. Rev. Lett. 94, 107401 (2005). This paper is the basis for quantum teleportation proposed in the project on the quantum network based on semiconductor quantum dots inside a photonic crystal.
 M. N. Leuenberger, D. Loss, Quantum Computing in Molecular Magnets, Nature 410, 789793 (2001). We show an electron spin resonance technique to implement quantum computing in molecular magnets.
Patents
 Michael N. Leuenberger, Michael E. Flatte, David D. Awschalom, Teleportation System For Electronic ManyQubit States Using Individual Photons, United States Patent, Patent No. US 7,667,995 B1, Date of Patent: Feb. 23, 2010.
 D. Chanda, A. Safaei, M. N. Leuenberger, Extraordinary Dynamically Tunable Absorption in Monolayer Graphene, United States Patent, Patent No. US 10,283,871, Date of Patent: June 4, 2019.
 D. Chanda, M. N Leuenberger, A. Safaei, S. Chandra, PlasmonAssisted Photothermoelectric EffectBased Detection of Infrared Radiation on Asymmetrically Patterned Graphene, US Patent App. 62/725,297, 2018.
Awards, Honors and Societies
 Member of the American Physical Society
 Member of the Florida Academy of Sciences