title: Germanium-Vacancy Single Color Centers in Diamond.
abstract: Atomic-sized fluorescent defects in diamond are widely recognized as a promising solid state platform for quantum cryptography and quantum information processing. For these applications, single photon sources with a high intensity and reproducible fabrication methods are required. In this study, we report a novel color center in diamond, composed of a germanium (Ge) and a vacancy (V) and named the GeV center, which has a sharp and strong photoluminescence band with a zero-phonon line at 602 nm at room temperature. We demonstrate this new color center works as a single photon source. Both ion implantation and chemical vapor deposition techniques enabled fabrication of GeV centers in diamond. A first-principles calculation revealed the atomic crystal structure and energy levels of the GeV center.
authors.affiliation: 1] Department of Physical Electronics, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan [2] CREST, Japan Science and Technology Agency, Chiyoda, Tokyo.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Iwasaki
authors.affiliation: Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Ishibashi
authors.affiliation: 1] CREST, Japan Science and Technology Agency, Chiyoda, Tokyo [2] Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Miyamoto
authors.affiliation: Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Doi
authors.affiliation: Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kobayashi
authors.affiliation: 1] CREST, Japan Science and Technology Agency, Chiyoda, Tokyo [2] Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.
authors.forename: Takehide
authors.initials: T
authors.lastname: Miyazaki
authors.affiliation: Department of Physical Electronics, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Tahara
authors.affiliation: Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQst), Ulm University, Albert-Einstein-Allee 11, Ulm D-89081, Germany.
authors.forename: Kay D
authors.initials: KD
authors.lastname: Jahnke
authors.affiliation: Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQst), Ulm University, Albert-Einstein-Allee 11, Ulm D-89081, Germany.
authors.forename: Lachlan J
authors.initials: LJ
authors.lastname: Rogers
authors.affiliation: Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQst), Ulm University, Albert-Einstein-Allee 11, Ulm D-89081, Germany.
authors.forename: Boris
authors.initials: B
authors.lastname: Naydenov
authors.affiliation: Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQst), Ulm University, Albert-Einstein-Allee 11, Ulm D-89081, Germany.
authors.forename: Fedor
authors.initials: F
authors.lastname: Jelezko
authors.affiliation: 1] CREST, Japan Science and Technology Agency, Chiyoda, Tokyo [2] Advanced Power Electronics Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamasaki
authors.affiliation: 1] Nagamachi Science Laboratory, Amagasaki, Hyogo 661-0976, Japan [2] Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Nagamachi
authors.affiliation: Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan.
authors.forename: Toshiro
authors.initials: T
authors.lastname: Inubushi
authors.affiliation: 1] CREST, Japan Science and Technology Agency, Chiyoda, Tokyo [2] Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Norikazu
authors.initials: N
authors.lastname: Mizuochi
authors.affiliation: 1] Department of Physical Electronics, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan [2] CREST, Japan Science and Technology Agency, Chiyoda, Tokyo.
authors.forename: Mutsuko
authors.initials: M
authors.lastname: Hatano