arXiv: Mesoscale and Nanoscale Physics
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Colloidal quantum dots are robust and flexible single photon emitters for room-temperature applications, but their purity is strongly reduced at high pump powers, due to multiexcitonic emission which cannot be easily filtered due to the photo-luminescence spectral broadening at room temperature. Giant-shell quantum dots feature a large blueshift of the biexciton spectrum due to electron-hole wave function engineering and piezoelectric charge separation, which can be exploited for spectral separa...
#1Rohit BabarH-Index: 7
#2Gergely BarczaH-Index: 10
Last. Viktor IvádyH-Index: 19
view all 11 authors...
Point defect qubits in semiconductors have demonstrated their outstanding high spatial resolution sensing capabilities of broad multidisciplinary interest. Two-dimensional (2D) semiconductors hosting such sensors have recently opened up new horizons for sensing in the subnanometer scales in 2D heterostructures. However, controlled creation of quantum sensor in a single layer 2D materials with high sensitivity has been elusive so far. Here, we report on a novel 2D quantum sensor, the VB2 centre i...
The antiferromagnet is a closed Hermitian system, we find that its excitations, even in the absence of dissipation, can be viewed as a non-Hermitian system with dissipative coupling. Consequently, the antiferromagnetic resonance spectrum does not show the typical level repulsion, but shows the level attraction -- a characteristic behavior often observed in non-Hermitian systems. Such behavior is because the antiferromagnetic ground state is \mathcal{PT}symmetric. This new understanding on ant...
Starting with general semiclassical equations of motion for electrons in the presence of electric and magnetic fields, we extend the Chambers' formula to include in addition to a magnetic field, time-dependent electric fields and bands with Berry curvature. We thereby compute the conductivity tensor {\sigma}_{{\alpha}{\beta}}(B,{\omega})in the presence of magnetic field for bands in two (2D) and three (3D) dimensions with Berry curvature. We focus then on several applications to magnetotransp...
Two-dimensional materials and their van der Waals heterostructures enable a large range of applications, including label-free biosensing. Lattice mismatch and work function difference in the heterostructure material result in strain and charge transfer, often varying at nanometer scale, that influence device performance. In this work, a multidimensional optical imaging technique is developed in order to map sub-diffractional distributions for doping and strain and understand the role of those fo...
Cathodoluminescence spectroscopy in conjunction with second-order auto-correlation measurements of g_2(\tau)allows to extensively study the synchronization of quantum light sources in low-dimensional structures. Co-existing excitons in two-dimensional transition metal dichalcogenide monolayers provide a great source of identical quantum emitters which can be simultaneously excited by an electron. In this article, we demonstrate large photon bunching with g_2(0)up to 156\pm16of a tungste...
#1George YumnamH-Index: 4
#2Jiasen GuoH-Index: 1
Last. Deepak SinghH-Index: 21
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Spin diode is important prerequisite to practical manifestation of spin electronics. Yet, a functioning magnetic diode at room temperature is still illusive. Here, we reveal diode-type phenomena due to magnetic charge mediated conduction in artificial honeycomb geometry, made of concave shape single domain permalloy element. We find that honeycomb lattice defies symmetry by populating vertices with low and high multiplicity magnetic charges, causing asymmetric magnetization, in applied current o...
#1Jue WangH-Index: 15
#2Christina ManolatouH-Index: 20
Last. Xiaoyang ZhuH-Index: 82
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The optical spectra of transition metal dichalcogenide (TMDC) monolayers are dominated by excitons and trions. Here we establish the dependences of these optical transitions on disorder from hyperspectral imaging of h-BN encapsulated monolayer MoSe2. While both exciton and trion energies vary spatially, these two quantities are almost perfectly correlated, with spatial variation in the trion binding energy of only ~0.18 meV. In contrast, variation in the energy splitting between the two lowest e...
Electron fluids have been predicted to display flow patterns featuring macroscopic vortices. While this behavior attracted interest as a signature of electron viscosity, linking it to the underlying mechanisms of carrier interaction and scattering on a microscale has remained an outstanding problem. We demonstrate that vorticity is linked to nonlocal conductivity response, no matter what origin. This makes vorticity a robust property transcending the boundaries of the hydrodynamic phase and bein...
#1Chandan Kumar (IISc: Indian Institute of Science)H-Index: 5
#2Anindya DasH-Index: 20
Low frequency 1/f noise is investigated in graphene, encapsulated between hexagonal boron nitride (hBN) substrate in dual gated geometry. The overall noise magnitude is smaller as compared to graphene on Si/SiO2 substrate. The noise amplitude in the hole doped region is independent of carrier density while in the electron doped region, a pronounced peak is observed, at Fermi energy, EF ~ 90 meV. The physical mechanism of the anomalous noise peak in the electron doped region is attributed to the ...
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