Publications

Daniel Shaffer, Martin Claassen, Ajit Srivastava and Luiz H. Santos

Physical review. B 109 15, 155160 (2024)

Weijie Li, Zacharia James Hadjri, Luka Matej Devenica, Jin Zhang, Song Liu, James Hone, Kenji Watanabe, Takashi Taniguchi, Angel Zorrilla-Rubio and Ajit Srivastava

Nature materials 22 12, 1478-1484 (2023)

Strongly bound excitons determine light-matter interactions in van der Waals heterostructures of two-dimensional semiconductors. Unlike fundamental particles, quasiparticles in condensed matter, such as excitons, can be tailored to alter their interactions and realize emergent quantum phases. Here, …

Weijie Li, Xin Lu, Jiatian Wu and Ajit Srivastava

Nature nanotechnology 16 2, 148-152 (2020)

Charge carriers in two-dimensional transition metal dichalcogenides (TMDs), such as WSe2, have their spin and valley-pseudospin locked into an optically addressable index that is proposed as a basis for future information processing1,2. The manipulation of this spin–valley index, which carries a…

Weijie Li, Xin Lu, Sudipta Dubey, Luka Devenica and Ajit Srivastava

Nature materials 19 6, 624-629 (2020)

Although photons in free space barely interact, matter can mediate interactions between them resulting in optical nonlinearities. Such interactions at the single-quantum level result in an on-site photon repulsion, crucial for photon-based quantum information processing and for realizing strongly…

Xin Lu, Xiaotong Chen, Sudipta Dubey, Qiang Yao, Weijie Li, Xingzhi Wang, Qihua Xiong and Ajit Srivastava

Nature nanotechnology 14 5, 426-431 (2019)

Bernhard Urbaszek and Ajit Srivastava

Nature 567 7746, 39-40 (2019)

Four studies demonstrate the vast opportunities provided by stacking pairs of monolayer materials and changing the resulting optical properties by twisting one material with respect to the other.

Xiaotong Chen, Xin Lu, Sudipta Dubey, Qiang Yao, Sheng Liu, Xingzhi Wang, Qihua Xiong, Lifa Zhang and Ajit Srivastava

Nature physics 15 3, 221-227 (2018)

Ajit Srivastava

Nature materials 17 5, 391-392 (2018)

Andrei Zholud, Ryan Freeman, Rongxing Cao, Ajit Srivastava and Sergei Urazhdin

Physical review letters 119 25, 257201 (2017)

We utilize a nanoscale magnetic spin-valve structure to demonstrate that current-induced magnetization fluctuations at cryogenic temperatures result predominantly from the quantum fluctuations enhanced by the spin transfer effect. The demonstrated spin transfer due to quantum magnetization…

Patrick Back, Meinrad Sidler, Ovidiu Cotlet, Ajit Srivastava, Naotomo Takemura, Martin Kroner and Atac Imamoğlu

Physical review letters 118 23, 237404 (2017)

Chongyun Jiang, Fucai Liu, Jorge Cuadra, Zumeng Huang, Ke Li, Abdullah Rasmita, Ajit Srivastava, Zheng Liu and Wei-Bo Gao

Nature communications 8 1 (2017)

Atomically thin monolayer transition metal dichalcogenides possess coupling of spin and valley degrees of freedom. The chirality is locked to identical valleys as a consequence of spin–orbit coupling and inversion symmetry breaking, leading to a valley analog of the Zeeman effect in presence of…

Meinrad Sidler, Patrick Back, Ovidiu Cotlet, Ajit Srivastava, Thomas Fink, Martin Kroner, Eugene Demler and Atac Imamoglu

Nature physics 13 3, 255-261 (2016)

The dynamics of a mobile quantum impurity in a degenerate Fermi system is a fundamental problem in many-body physics. The interest in this field has been renewed due to recent ground-breaking experiments with ultracold Fermi gases1,2,3,4,5. Optical creation of an exciton or a polariton in a…

Ajit Srivastava and Ataç Imamoğlu

Physical review letters 115 16, 166802 (2015)

Ajit Srivastava, Meinrad Sidler, Adrien V. Allain, Dominik S. Lembke, Andras Kis and A. Imamoğlu

Nature nanotechnology 10 6, 491-496 (2015)

Semiconductor quantum dots have emerged as promising candidates for the implementation of quantum information processing, because they allow for a quantum interface between stationary spin qubits and propagating single photons1,2,3. In the meantime, transition-metal dichalcogenide monolayers have…

Ajit Srivastava, Meinrad Sidler, Adrien V. Allain, Dominik S. Lembke, Andras Kis and A. Imamoğlu

Nature physics 11 2, 141-147 (2015)

A monolayer of a transition metal dichalcogenide such as WSe2 is a two-dimensional direct-bandgap valley-semiconductor1,2 having an effective honeycomb lattice structure with broken inversion symmetry. The inequivalent valleys in the Brillouin zone could be selectively addressed using circularly…

Christian Latta, Ajit Srivastava and Atac Imamoğlu

Physical review letters 107 16, 167401 (2011)

Ajit Srivastava and Junichiro Kono

Physical review. B, Condensed matter and materials physics 79 20, 205407 (2009)

To provide physical insight into the recently observed photoluminescence saturation behavior in single-walled carbon nanotubes implying the existence of an upper limit of exciton densities, we have performed a time-dependent theoretical study of diffusion-limited exciton-exciton annihilation in the …

Ajit Srivastava, Han Htoon, Victor I. Klimov and Junichiro Kono

Physical review letters 101 8, 087402 (2008)

Yoshihiko Mizumoto, Yosuke Kayanuma, Ajit Srivastava, Junichiro Kono and Alan H. Chin

Physical review. B, Condensed matter and materials physics 74 4 (2006)

Under the illumination of intense off-resonant laser light, the electronic states of semiconductors are strongly modified, or dressed, by the oscillating electric field. We present a framework using linear combination of atomic orbital band theory to calculate the dressed band structure and optical …

Ajit Srivastava, Rahul Srivastava, Jigang Wang and Junichiro Kono

Physical review letters 93 15 (2004)

We report the observation of large (∼40%) laser-induced above-band-gap transparency in GaAs at room temperature. The induced transparency is present only during the pulse width of the driving midinfrared laser pulses and its spectral shape is consistent with a laser-induced blueshift of the band…