David Gershoni
Technion Israel Institute of Technology, Physics, Faculty Member
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We use visible - infrared (IR) dual beam time-resolved spectroscopy to study the dynamics of carriers in optically pumped laser devices containing quantum heterostructures within their active layers. We tune the IR probe energy through... more
We use visible - infrared (IR) dual beam time-resolved spectroscopy to study the dynamics of carriers in optically pumped laser devices containing quantum heterostructures within their active layers. We tune the IR probe energy through the intersubband absorption resonance and thereby directly measure the momentum space distribution of carriers within the first conduction subband of the lasing device. We study
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Electron-electron interactions have strong effects on the low-energy excitations of a one-dimensional metal. Luttinger liquid theory, which is supposed to describe this situation, predicts, among other things, that an injected electron... more
Electron-electron interactions have strong effects on the low-energy excitations of a one-dimensional metal. Luttinger liquid theory, which is supposed to describe this situation, predicts, among other things, that an injected electron will split into separate charge and spin excitations, which propagate at different velocities. We shall review some experiments and theoretical analyses where spin-charge separation can have manifest consequences, including discussion of the spin-incoherent regime, which can occur in low-density ...
Research Interests:
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We use visible - infrared (IR) dual beam time-resolved spectroscopy to study the dynamics of carriers in optically pumped laser devices containing quantum heterostructures within their active layers. We tune the IR probe energy through... more
We use visible - infrared (IR) dual beam time-resolved spectroscopy to study the dynamics of carriers in optically pumped laser devices containing quantum heterostructures within their active layers. We tune the IR probe energy through the intersubband absorption resonance and thereby directly measure the momentum space distribution of carriers within the first conduction subband of the lasing device. We study
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Electron-electron interactions have strong effects on the low-energy excitations of a one-dimensional metal. Luttinger liquid theory, which is supposed to describe this situation, predicts, among other things, that an injected electron... more
Electron-electron interactions have strong effects on the low-energy excitations of a one-dimensional metal. Luttinger liquid theory, which is supposed to describe this situation, predicts, among other things, that an injected electron will split into separate charge and spin excitations, which propagate at different velocities. We shall review some experiments and theoretical analyses where spin-charge separation can have manifest consequences, including discussion of the spin-incoherent regime, which can occur in low-density ...
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We demonstrate experimentally that a polarized nuclear spin modifies the dynamic behavior of a neighboring electronic spin. Specifically, an out-of-phase component appears in the electronic spin-echo signal. This component is proportional... more
We demonstrate experimentally that a polarized nuclear spin modifies the dynamic behavior of a neighboring electronic spin. Specifically, an out-of-phase component appears in the electronic spin-echo signal. This component is proportional to the nuclear spin degree of polarization and strongly depends on the nuclear polarization direction. When the electronic spin is surrounded by a polarized nuclear spin bath, the spin-echo quadrature manifests a characteristic frequency related only to the nuclear spins abundance and their collective polarization. We use this analysis to propose a novel measurement method for the local nuclear spin bath of a single electronic spin. We quantify the realistic experimental regimes at which the scheme is efficient. Our proposal has potential applications for quantum sensing schemes, and opens a route for a systematic study of polarized mesoscopical-systems.
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ABSTRACT © 2003 Optical Society of America
We demonstrate for the first time that the quantum dot confined dark exciton is a natural, coherent and long-lived qubit. We optically “write” its spin state and successfully “read” its subsequent coherent evolution.
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... r in A V(r) = VB(r), r in B where VA and VB are the perfect periodic potentials ... Notice that aaaa ax, axv axv ax , Therefore, any component of DA'(I, v) that is odd under interchange ... I - /r-I 'NI .-o I , r I II... more
... r in A V(r) = VB(r), r in B where VA and VB are the perfect periodic potentials ... Notice that aaaa ax, axv axv ax , Therefore, any component of DA'(I, v) that is odd under interchange ... I - /r-I 'NI .-o I , r I II IIIIIIIIIIIIII 4020 43 EIGENFUNCTION-EXPANSION METHOD FOR SOLVING THE. ...
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We present a study of the excitons in quantum wells of Ga1-xInxAs grown on InP substrates. Well-resolved optical transitions between confined particle states were measured by photoluminescence and photocurrent excitation. Well dimensions... more
We present a study of the excitons in quantum wells of Ga1-xInxAs grown on InP substrates. Well-resolved optical transitions between confined particle states were measured by photoluminescence and photocurrent excitation. Well dimensions were varied from 10 to 200 A&#778, as ascertained by high-resolution transmission microscopy and x-ray diffraction. The combination of a detailed optical and structural characterization allows for a
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... L.VÌNA Depro. Física de Materiales, UÀ M. E-28049, Madrid, Spam, E-mail: luis, vina@imm.es M. POTEMSKÏ GHMFL, MPÏÏFKF and CNRS. 25 av. ... Física de Materiales, UAM. E-28049. Madrid, Spain. E-mail: luis.vina(iò,uam.es M. POTEMSKT... more
... L.VÌNA Depro. Física de Materiales, UÀ M. E-28049, Madrid, Spam, E-mail: luis, vina@imm.es M. POTEMSKÏ GHMFL, MPÏÏFKF and CNRS. 25 av. ... Física de Materiales, UAM. E-28049. Madrid, Spain. E-mail: luis.vina(iò,uam.es M. POTEMSKT GHMFL, MPI/FKF and CNRS 25 av. ...