Dr. Ashish Arora

Postdoc

Physikalisches Institut

Wilhelm-Klemm-Str. 10
48149 Münster

arora@uni-muenster.de

Tel.: +49 251 83-36577

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Publications

• Strain tuning of the Stokes shift in atomically thin semiconductors, I. Niehues, P. Marauhn, T. Deilmann, D. Wigger, R. Schmidt, A. Arora, S. Michaelis de Vasconcellos, M. Rohlfing, and R. Bratschitsch, Nanoscale 12, 20786-20796 (2020)
• Dark trions govern the temperature-dependent optical absorption and emission of doped atomically thin semiconductors, A. Arora, N. K. Wessling, T. Deilmann, T. Reichenauer, P. Steeger, P. Kossacki, M. Potemski, S. Michaelis de Vasconcellos, M. Rohlfing, and R. Bratschitsch, Phys. Rev. B 101, 241413 (2020)
• Excited-state trions in monolayer WS2, A. Arora, T. Deilmann, T. Reichenauer, J. Kern, S. Michaelis de Vasconcellos, M. Rohlfing, and R. Bratschitsch, Phys. Rev. Lett. 123, 167401 (2019)
• Thickness-dependent refractive index of 1L, 2L, and 3L MoS₂, MoSe₂, WS_2, and WSe₂, C. Hsu, R. Frisenda, R. Schmidt, A. Arora, S. Michaelis de Vasconcellos, R. Bratschitsch, H. S. J. van der Zant, and A. Castellanos-Gomez, Adv. Optical Mater. 7,1900239 (2019)
• Zeeman spectroscopy of excitons and hybridization of electronic states in few-layer WSe₂, MoSe₂ and MoTe₂, A. Arora, M. Koperski, A. Slobodeniuk, K. Nogajewski, R. Schmidt, R. Schneider, M. Molas, S. Michaelis de Vasconcellos, R. Bratschitsch, and M. Potemski, 2D Materials 6, 015010 (2018)
• Orbital, spin and valley contributions to Zeeman splitting of excitonic resonances in MoSe₂, WSe₂ and WS₂ Monolayers, M. Koperski, M. R. Molas, A. Arora, K. Nogajewski, M. Bartos, J. Wyzula, D. Vaclavkova, P. Kossacki, and M. Potemski, 2D Materials 6, 015001 (2018)
• Valley-contrasting optics of interlayer excitons in Mo- and W-based bulk transition metal dichalcogenides, A. Arora, T. Deilmann, P. Marauhn, M. Drüppel, R. Schneider, M. R. Molas, D. Vaclavkova, S. Michaelis de Vasconcellos, M. Rohlfing, M. Potemski, and R. Bratschitsch, Nanoscale 10, 15571-15577 (2018)
• Facile synthesis of WS₂ nanotubes by sulfurization of tungsten thin films: formation mechanism, structural and optical properties, E. Hossain, A. A. Rahman, R. Bapat, J. B. Parmar, A. P. Shah, A. Arora, R. Bratschitsch, and A. Bhattacharya, Nanoscale 10, 16683-16691 (2018)
• Exciton-phonon coupling in mono- and bilayer MoTe₂, S. Helmrich, R. Schneider, A. W. Achtstein, A. Arora, B. Herzog, S. Michaelis de Vasconcellos, M. Kolarczik, O. Schoeps, R. Bratschitsch, U. Woggon, and N. Owschimikow, 2D Materials 5, 045007 (2018)
• Phonon sidebands in monolayer transition metal dichalcogenides, D. Christiansen, M. Selig, G. Berghäuser, R. Schmidt, I. Niehues, R. Schneider, A. Arora, S. Michaelis de Vasconcellos, R.  Bratschitsch, E. Malic, and A. Knorr, Phys. Rev. Lett. 119, 187402 (2017)
• Interlayer excitons in a bulk van der Waals semiconductor, A. Arora, M. Drüppel, R. Schmidt, T. Deilmann, R. Schneider, M. R. Molas, P. Marauhn, S. Michaelis de Vasconcellos, M. Potemski, M. Rohlfing, and R. Bratschitsch, Nature Communications 8, 639 (2017)
• Valley dynamics of excitons in monolayer dichalcogenides,  G. Plechinger, P. Nagler, A. Arora, R. Schmidt, A. Chernikov, J. Lupton, R. Bratschitsch, C. Schüller, and T. Korn, Phys. Status Solidi RRL 11, No. 7, 1700131 (2017)
• Highly anisotropic in-plane excitons in atomically thin and bulk-like 1T'-ReSe₂ , A. Arora, J. Noky, M. Drüppel, B. Jariwala, T. Deilmann, R. Schneider, R. Schmidt, O. Del Pozo Zamudio, T. Stiehm, A. Bhattacharya, P. Krüger, S. Michaelis de Vasconcellos, M. Rohlfing, and R. Bratschitsch, Nano Lett. 17, 3202 (2017)

• Optical properties of atomically thin transition metal dichalcogenides: observations and puzzles, M. Koperski, M. R. Molas, A. Arora, K. Nogajewski, A. O. Slobodeniuk, C. Faugeras, and M. Potemski, Nanophotonics (online available, 2017)
  

• Excitonic valley effects in monolayer WS₂ under high magnetic fields, G. Plechinger, P. Nagler, A. Arora, A. Granados del Aguila, M. V. Ballotin, T. Frank, P. Steinleitner, M. Gmitra, J. Fabian, P. C. M. Christianen, R. Bratschitsch, C. Schüller, and T. Korn, Nano Lett. 16 (12), 7899 (2016)
• Trion fine structure and coupled spin-valley dynamics in monolayer tungsten disulfide, G. Plechinger, P. Nagler, A. Arora, R. Schmidt, A. Chernikov, A. Granados del Aguila, P. C. M. Christianen, R. Bratschitsch, C. Schüller, and T. Korn, Nature Communications 7, 12715 (2016)
• Magnetic-field-induced rotation of polarized light emission from monolayer WS₂, R. Schmidt,* A. Arora,* G. Plechinger, P. Nagler, A. Granados del Águila, M. V. Ballottin, P. C. M. Christianen, S. Michaelis de Vasconcellos, C. Schüller, T. Korn, and R. Bratschitsch, Phys. Rev. Lett., 117,077402 (2016) (*equal contribution)
  
• Valley Zeeman splitting and valley polarization of neutral and charged excitons in monolayer MoTe₂  at high magnetic fields, A. Arora, R. Schmidt, R. Schneider, M. Molas, I. Breslavetz, M. Potemski, and R. Bratschitsch, Nano Lett. 16, 3624 (2016)

• Exciton band structure in layered MoSe₂: From a monolayer to the bulk limit, A. Arora, K. Nogajewski, M. Molas, M. Koperski, and M. Potemski, Nanoscale 7, 20769 (2015)

• Excitonic resonances in thin films of WSe₂: From monolayer to bulk material, A. Arora, M. Koperski, K. Nogajewski, J. Marcus, C. Faugeras, and M. Potemski, Nanoscale, 7, 10421 (2015)

• Single photon emitters in exfoliated WSe₂ structures, M. Koperski, K. Nogajewski, A. Arora, J. Marcus, P. Kossacki, and M. Potemski, Nat. nanotechnol. 10, 503 (2015)

• Indirect-to-direct band-gap crossover in few layer MoTe_2, I. G. Lezama, A. Arora, A. Ubaldini, C. Barreateau, E. Giannini, M. Potemski, and A. Morpurgo, Nano Lett. 15, 2336 (2015)

• Polarization of emission from non-polar III-nitride quantum wells: The influence of confinement, A. Arora and S. Ghosh,  J. Phys. D: Appl. Phys. 47 045101 (2014)

• Large exciton g-factors in anisotropically strained A-plane GaN film measured using magneto-optical Kerr effect spectroscopy, A. Arora, N. Hatui, A. Bhattacharya, and S. Ghosh, App. Phys. Lett. 103, 052109 (2013)

• Magneto-optical Kerr effect spectroscopy based study of Lande g-factor for holes in GaAs/AlGaAs single quantum wells under low magnetic fields, A. Arora, A. Mandal, S. Chakrabarti, and S. Ghosh, J. App. Phys. 113, 213505 (2013)

• A mirror based polar magneto-optical Kerr effect spectroscopy arrangement, A. Arora, S. Ghosh, and V. Sugunakar, Rev. Sci. Instrum. 82, 123903 (2011)

• Anisotropic structural and optical properties of a-plane (11-2 0) A/InN nearly-lattice-matched to GaN, M. R. Laskar, T. Ganguli, A. A. Rahman, A. Arora, N. Hatui, M. R. Gokhale, S. Ghosh, and A. Bhattacharya, App. Phys. Lett. 98, 181108 (2011)

• A twisted periscope arrangement for transporting elliptically polarized light without change in its polarization state, A. Arora and S. Ghosh, Rev. Sci. Instrum. 81, 123102 (2010)

• Polarization sensitive lateral photoconductivity in GaAs/AlGaAs quantum well based structures on low-temperature grown GaAs(001), A. Arora, S. Ghosh, B. M. Arora, S. Malzer, and G. Döhler, App. Phys. Lett. 97, 081902 (2010)

• Fiber optic based system for polarization sensitive spectroscopy of semiconductor quantum structures, A. Arora, S. Sharma, B. Karmakar, M. Schardt, S. Malzer, B. Bansal, G. Döhler, and B. M. Arora, Rev. Sci. Instrum. 81, 083901 (2010)

Awards/Fellowships