Publications (19)
Photoemission signature of excitons
Avinash Rustagi, Alexander F. Kemper
Excitons - the particle-hole bound states - composed of localized electron-hole states in semiconducting systems are crucial to explaining the optical spectrum. Spectroscopic measu…
Electrically tunable moiré magnetism in twisted double bilayers of chromium triiodide
Guanghui Cheng, Mohammad Mushfiqur Rahman, Andres Llacsahuanga Allcca +10
Moiré superlattices in van der Waals structures can be used to control the electronic properties of the material and lead to emergent correlated and topological phenomena. Its fir…
Experimental observation of coupled valley and spin Hall effect in p-doped WSe2 devices
Terry Y. T. Hung, Avinash Rustagi, Shengjiao Zhang +2
Giant spin Hall effect (GSHE) has been observed in heavy metal materials such as Ta, Pt, and W, where spins are polarized in the surface plane and perpendicular to the charge curre…
Coherent Excitonic Quantum Beats in Time-Resolved Photoemission Measurements
Avinash Rustagi, Alexander F. Kemper
Coherent excitation of materials via ultrafast laser pulses can have interesting, observable dynamics in time-resolved photoemission measurements. The broad spectral width of ultra…
Terahertz radiation from accelerating charge carriers in graphene under ultrafast photoexcitation
Avinash Rustagi, C. J. Stanton
We study the generation of THz radiation from the acceleration of ultrafast photoexcited charge carriers in graphene in the presence of a DC electric field. Our model is based on c…
Research News -- Observation of Exotic Heavy Baryons
B. Ananthanarayan, Keshav Choudhary, Lishibanya Mohapatra +3
We review the recent discoveries of exotic heavy baryons at the Fermi National Accelerator Laboratory.
Theoretical phase diagram for the room temperature Electron-Hole Liquid in photo-excited quasi-2D monolayer MoS
Avinash Rustagi, Alexander F. Kemper
Strong correlations between electrons and holes can drive the existence of an electron-hole liquid (EHL) state, typically at high carrier densities and low temperatures. The recent…
Electric field control of interaction between magnons and quantum spin defects
Abhishek Bharatbhai Solanki, Simeon I. Bogdanov, Avinash Rustagi +10
Hybrid systems coupling quantum spin defects (QSD) and magnons can enable unique spintronic device functionalities and probes for magnetism. Here, we add electric field control of…
Subnanosecond Fluctuations in Low-Barrier Nanomagnets
Jan Kaiser, Avinash Rustagi, Kerem Y. Camsari +3
Fast magnetic fluctuations due to thermal torques have useful technological functionality ranging from cryptography to probabilistic computing. The characteristic time of fluctuati…
Emergence of electric-field-tunable interfacial ferromagnetism in 2D antiferromagnet heterostructures
Guanghui Cheng, Mohammad Mushfiqur Rahman, Zhiping He +12
Van der Waals (vdW) magnet heterostructures have emerged as new platforms to explore exotic magnetic orders and quantum phenomena. Here, we study heterostructures of layered antife…
Manipulating quantum impurity spins via dynamical modes of nanomagnets
Avinash Rustagi, Shivam Kajale, Pramey Upadhyaya
Quantum impurity (QI) spins offer promising information processing and sensing applications by harnessing up to room-temperature quantum coherence. Challenged by the requirement of…
Coupled spin-charge dynamics in magnetic van der Waals heterostructures
Avinash Rustagi, Abhishek Solanki, Yaroslav Tserkovnyak +1
We present a phenomenological theory for coupled spin-charge dynamics in magnetic van der Waals heterostructures. The system studied consists of a layered antiferromagnet inserted…
Intrinsic coherent acoustic phonons in indirect band gap semiconductors Si and GaP
Kunie Ishioka, Avinash Rustagi, Ulrich Hoefer +2
We report on the intrinsic optical generation and detection of coherent acoustic phonons at (001)-oriented bulk Si and GaP without metallic phonon transducer structures. Photoexcit…
Electrically Active Domain Wall Magnons in Layered van der Waals Antiferromagnets
Mohammad Mushfiqur Rahman, Avinash Rustagi, Yaroslav Tserkovnyak +1
We study theoretically domain wall (DW) magnons-elementary collective excitations of magnetic DWs -- in easy-axis layered van der Waals (vdW) antiferromagnets, where they behave as…
Sub-picosecond acoustic pulses at buried GaP/Si interfaces
Kunie Ishioka, Avinash Rustagi, Andreas Beyer +5
We report on the optical generation and detection of ultrashort acoustic pulses that propagate in three-dimensional semiconductor crystals. Photoexcitaiton of lattice-matched GaP l…
Research News -- Observation of oscillation phenomena in heavy meson systems
B. Ananthanarayan, Keshav Choudhary, Lishibanya Mohapatra +3
We review the recent discoveries of rare oscillation phenomena in certain heavy neutral meson systems.
Flatband-Induced Itinerant Ferromagnetism in RbCoSe
Jianwei Huang, Zhicai Wang, Hongsheng Pang +8
CoSe (=K,Rb,Cs) is a homologue of the iron-based superconductor, FeSe. From a comprehensive study of RbCoSe via measurements of magnetization, tran…
Sensing chiral magnetic noise via quantum impurity relaxometry
Avinash Rustagi, Iacopo Bertelli, Toeno van der Sar +1
We present a theory for quantum impurity relaxometry of magnons in thin films, exhibiting quantitative agreement with recent experiments without needing arbitrary scale factors use…
Observing coherences with time-resolved photoemission
Alexander F. Kemper, Avinash Rustagi
We discuss the potential creation and measurement of coherences in both dispersive solids and qubit-like single levels using current generation time- and angle-resolved photoemissi…