Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session B58: Nanoscale Characterization of Correlated and Entangled Quantum PhenomenaInvited Session Live
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Sponsoring Units: GIMS Chair: Petro Maksymovych, Oak Ridge National Lab |
Monday, March 15, 2021 11:30AM - 12:06PM Live |
B58.00001: Tip-enhanced Strong Coupling: Broadband Room Temperature Pico-cavity QED with Single Emitters Invited Speaker: Markus Raschke Optical cavities can enhance and control the light-matter interaction by modifying the local electromagnetic environment of a quantum emitter. However, large cavity mode volumes have prevented strong coupling of single emitters under ambient conditions. We demonstrate tip-enhanced strong coupling (TESC) spectroscopy, imaging, and control based on scanning probe microscopy using plasmonic antenna-tips forming a pico-cavity with the emitter [1]. With single quantum dots we observe room temperature mode splitting up to 160 meV with even sub-nanometer scale mode confinement and atomic precision spatial control [2]. In the extension to the infrared we control molecular vibrations through configurable optical interactions of a nanotip with quantum interference [3] and Purcell enhancement >106 [4]. This work establishes a new paradigm of pico-cavity QED for coherent control of quantum states in solid state emitters and at room temperature. [1] K-D Park et al., Nat. Nanotechnol. 13, 59 (2018). [2] K.-D. Park et al., Science Adv. 5, eaav5931 (2019). [3] E. A. Muller, et al., ACS Photonics 5, 3594 (2018). [4] B. Metzger et al., Phys. Rev. Lett. 123, 153001 (2019). |
Monday, March 15, 2021 12:06PM - 12:42PM Live |
B58.00002: Revealing topological surface states with STM-based spectroscopy Invited Speaker: An-Ping Li Topological insulators possess Dirac surface states with spin–momentum locked band dispersion. Breaking time-reversal symmetry can create an exchange gap and open a door to many exotic quantum states. STM spectroscopy is uniquely suitable for detecting the topological surface states. In this talk, we will present two examples to illustrate how STM spectroscopy resolves spin helical states on Bi2Te2Se and gapped surface states on MnBi2Te4. First, a multi-probe STM with spin-polarized tips offers in situ transport spectroscopy allowing differentiations of surface conductance and spin-momentum locked chemical potential from contributions of the bulk states [1]. A spin-polarized transport is revealed with ultra-high mobility and spin polarization [2]. Second, quasi-particle interference STM is used to probe local dispersions of both surface and bulk bands, which allows access to the gapped surface states with high spatial resolution [3]. The revealed surface gap is near the Fermi level and resides the bulk band gap, providing the key to access to other emergence phenomena such as quantum anomalous Hall effect and axion insulator state. |
Monday, March 15, 2021 12:42PM - 1:18PM Live |
B58.00003: From Atoms to Transistors Invited Speaker: Shashank Misra Since the advent of atomic manipulation with the scanning tunneling microscope (STM), a significant challenge for atomic scale fabrication has been to build structures large enough to exhibit emergent phenomena. STM-based hydrogen lithography on silicon can be used to create donor-based electronic devices atom-by-atom, a process we refer to as atomic precision advanced manufacturing (APAM). Although this capability promises to create a tactile link between atomic structure and system-level behavior, application of this technique has been held back by two factors. I will detail our efforts to both make more atomically perfect devices, and more complex devices. Moving forward, these advances open the door to using the technology to create everything from analog quantum simulators to new transistor technologies in silicon. |
Monday, March 15, 2021 1:18PM - 1:54PM Live |
B58.00004: Toward practical quantum-enhanced microscopies Invited Speaker: Benjamin Lawrie Quantum light sources are increasingly essential to the development of the next generation of sensors and microscopes. While squeezed light exhibiting quantum noise reduction has been leveraged to enable quantum-enhanced measurements of microcantilever beam displacement, substantial further improvements are required to enable realistic quantum-enhanced scanning probe microscopy. We will discuss an approach to scanning probe microscopy based on truncated nonlinear interferometry that enables minimum photon back-action noise while also operating below the photon shot noise limit [1]. Further, we will explore photon correlation measurements in cathodoluminescence microscopies as a path toward the sub-diffraction-limited characterization of single color centers and excitons in nanostructured and 2D materials. |
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